| 单词 | felspar |
| 例句 | Everywhere were little grains of felspar, mica, or quartz, which caught the reflection of the light. Treasure of Kings Being the Story of the Discovery of the \\"Big Fish,\\" or the Quest of the Greater Treasure of the Incas of Peru. 2012-04-09T02:00:30.007Z It turned evenly, slowly, noiselessly, and, as it turned, the light from the lamp caused the quartz and mica and felspar in the granite to glisten like a thousand fire-flies on a summer's evening. Across the Cameroons A Story of War and Adventure 2012-03-19T02:00:28.667Z There is also quartz, and often a considerable amount of felspar, while graphite, tourmaline and iron oxides frequently occur in lesser quantity. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z The Chinese and Japanese, with which may be assimilated the German and French, all of them made of kaolin and felspar, sometimes with an addition of quartz. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z Their felspar ranges from oligoclase to andesite and labradorite, and is often very zonal; sanidine occurs also in some dacites, and when abundant gives rise to rocks which form transitions to the rhyolites. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z The Serpentine rock streaked with hornblende, felspar, slate and green-stone, shows changing colours like a pigeon's breast. Cornwall 2012-01-20T03:00:16.790Z When the felspar assumed the appearance of a slaty claystone, which it did towards the base of the mountains on the banks of the river, we observed no copper in it. A Journey from Prince of Wales's Fort in Hudson's Bay to the Northern Ocean in the Years 1769, 1770, 1771, 1772 New Edition with Introduction, Notes, and Illustrations 2011-12-26T03:00:13.520Z Each mineral may also enclose particles of the others; in the quartz, for example, small crystals of graphite, biotite, iron oxides, sillimanite or felspar may appear in great numbers. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z This is a kind of hard porcelain made from a mixture of kaolin and felspar, in which the degree of hardness or fusibility is regulated by the proportion of one material towards the other. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z In the hand specimen many of the hornblende and biotite dacites are grey or pale brown and yellow rocks with white felspars, and black crystals of biotite and hornblende. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z In the decomposition of granite, this felspar is the first thing to give way; it becomes friable, and rains or rivers wash it down. Harper's New Monthly Magazine Vol. IV, No. 19, Dec 1851 2011-12-25T03:00:11.297Z Generally speaking, kaolin, China clay, ball clay, pipe clay, China stone, felspar, flint, quartz, sand, lime, chalk, and calcined bone are the ingredients of most modern pastes. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z The formation of new felspar in the hornfelses is pointed out as evidence of this. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z In it the felspar retains its alkaline element, so that it can be easily melted, and is found a useful and cheap flux for the vitrification of the different mixtures. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z The commonest accessory minerals are tourmaline, topaz, apatite, fluorspar and iron oxides; a little felspar more or less altered may also be present and a brown mica which is biotite or lithionite. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 5 "Greek Law" to "Ground-Squirrel" 2011-12-05T03:00:51.527Z Around the garnets there is often a radial grouping of small grains of pyroxene and hornblende in a clear matrix of felspar: these “centric” structures are frequent in granulites. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z Its extraordinary changes in reducing or oxidizing fires are of the greatest interest to the experimenter.Cornish or China Stone.—A rock composed of felspar and quartz. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z Whence came this green olivine?—whence this plate of specular iron?—whence this quartz and felspar; and all these other minerals I see around me? Blackwood's Edinburgh Magazine, Vol. 60, No. 373, November 1846 2011-10-21T02:00:17.417Z Albite, al′bīt, n. a species of mineral of the felspar family, of a white colour, and forming a constituent of many kinds of rocks. Chambers's Twentieth Century Dictionary (part 1 of 4: A-D) 2011-10-11T02:01:08.990Z At their outer edges they pass gradually into the granite, for they contain felspar crystals more or less completely altered into aggregates of white mica and quartz. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 5 "Greek Law" to "Ground-Squirrel" 2011-12-05T03:00:51.527Z Of the felspars the plagioclase separates first and forms well-shaped crystals of which the central parts may be more basic than the outer zones. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z Porcelain glazes, though not differing so much in composition from the ordinary fine earthenware glazes, are extremely hard, being compounded of kaolin, felspar, and quartz, with possibly limestone and ground sherds. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z This mica schist passes into a white gneiss, composed of quartz, white felspar, and black mica, penetrated by veins, coarsely crystallised, of the same minerals. In the Arctic Seas A Narrative of the Discovery of the Fate of Sir John Franklin and his Companions 2011-10-10T02:00:18.377Z It may occasionally be dug into for a depth of 20 or 30 ft., the quartz crystals and veins retaining their original positions, while the felspar is completely kaolinized. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z The felspar is sometimes very clear and fresh, its crystals being for the most part short and broad, with rather irregular or rounded outlines. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z Exceptions to this sequence are unusual; sometimes the first of the felspars have preceded the hornblende or biotite which may envelop them in ophitic manner. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z The felspar or China stone furnish the fluxing ingredients for fusing and binding. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z Blackish grey, fine grained, gneissose granite, composed of quartz, white felspar, and large quantities of fine grains and flakes of hornblende, passing into black mica. In the Arctic Seas A Narrative of the Discovery of the Fate of Sir John Franklin and his Companions 2011-10-10T02:00:18.377Z Minerals like felspar and mica are fused more readily than quartz, but analysis shows that some fulgurite glasses are very rich in silica, which perhaps was dissolved in the glass rather than simply fused. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z In these the minerals have a parallel arrangement, the felspars are often broken down by pressure into a mosaic of irregular grains, while greenish fibrous or bladed amphibole takes the place of pyroxene and olivine. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z The felspar is pearly, white or pink, with smooth cleaved surfaces; the quartz is usually transparent, glassy with rough irregular fractures; the micas appear as shining black or white flakes. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z Porcelain, which is composed, in England, of sand, calcined bones, china-clay, and potash; and, at Dresden, of kaolin, felspar, and broken biscuit-porcelain; 2. Triumphs of Invention and Discovery in Art and Science 2011-07-19T02:00:21.280Z A red granite, graphic texture, composed of quartz and red felspar, coarse grained. γ. In the Arctic Seas A Narrative of the Discovery of the Fate of Sir John Franklin and his Companions 2011-10-10T02:00:18.377Z As a rule their ingredients are not determinable by the unaided eye, but they are principally felspar and quartz as very minute particles. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 "Fairbanks, Erastus" to "Fens" 2011-06-19T02:00:16.580Z Of their minerals felspar Is usually the most abundant, and is principally labradorite and bytownite, though anorthite occurs in some, while oligoclase and orthoclase have been found in others. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z An earlier generation of felspar, and occasionally also of quartz, may be represented by large and perfect crystals of these minerals giving the rock a porphyritic character. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z Stoneware, composed of several kinds of plastic clay, mixed with felspar and sand, and occasionally a little lime. Triumphs of Invention and Discovery in Art and Science 2011-07-19T02:00:21.280Z These plates of mica are separated by bands of pure white felspar. In the Arctic Seas A Narrative of the Discovery of the Fate of Sir John Franklin and his Companions 2011-10-10T02:00:18.377Z Although the crystals of all felspars present a general resemblance in habit, they are usually regarded as belonging to two systems, some felspars being monoclinic and others anorthic. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 "Fairbanks, Erastus" to "Fens" 2011-06-19T02:00:16.580Z Some authors believe that the development of saussurite from felspar is also dependent on pressure rather than on weathering, and an analogous change may affect the olivine, replacing it by talc, chlorite, actinolite and garnet. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z In this way the rotten granite or china stone, used in pottery, originates; and over considerable areas kaolin replaces the felspar and forms valuable sources of china clay. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z Even graphic tellurium and felspar look, at their clearest, anything but legible. The Seven Lamps of Architecture 2011-04-20T02:00:20.760Z It is composed of quartz, red felspar, and dark green chlorite; and is accompanied with gneiss of the same composition. In the Arctic Seas A Narrative of the Discovery of the Fate of Sir John Franklin and his Companions 2011-10-10T02:00:18.377Z Twin-crystals are very common in all the felspars, as explained under their respective headings. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 "Fairbanks, Erastus" to "Fens" 2011-06-19T02:00:16.580Z The forms throughout the felspar series are closely similar, and the hardness is uniform, being just below that of quartz, and about that of a steel file. The New Gresham Encyclopedia Volume 4, Part 3: Estremoz to Felspar 2011-04-14T02:00:59.373Z The spheroids range from a fraction of an inch to a foot in diameter, and may have a felspar crystal at the centre. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z Diabase, originally an equivalent of diorite; then used for chloritic igneous rocks of the Intermediate series of various grain; and now usually for a type of dolerite in which the felspar is embedded in augite. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z Syenite, composed of honey-yellow felspar and hornblende, in very large crystals, the felspar passing into red and pink, and the whole rock mass penetrated by veins of the same material, but fine grained. In the Arctic Seas A Narrative of the Discovery of the Fate of Sir John Franklin and his Companions 2011-10-10T02:00:18.377Z All the felspars have a hardness of 6 to 6.5, being therefore rather less hard than quartz. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 "Fairbanks, Erastus" to "Fens" 2011-06-19T02:00:16.580Z Albite, the sodium felspar, has 68.8 per cent of silica, and the species between this and anorthite are regarded as mixtures of albite and anorthite molecules. The New Gresham Encyclopedia Volume 4, Part 3: Estremoz to Felspar 2011-04-14T02:00:59.373Z These larger felspars have no crystalline outlines and consist of orthoclase or microcline surrounded by borders of white oligoclase. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z I am that amulet of green felspar, the necklace of the god Ra, which is given unto them that are on the horizon. The Religions of Ancient Egypt and Babylonia 2011-04-14T02:00:46.297Z The hills are in general rounded, and marked by broad veins of similar composition, but containing more perfectly crystallised felspar, quartz, and zeolith. The Highlands of Ethiopia 2011-02-25T03:01:07.193Z Mallard suggested that all felspars are really asymmetric, and that orthoclase presents only a pseudo-monosymmetric habit, due to twinning. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 "Fairbanks, Erastus" to "Fens" 2011-06-19T02:00:16.580Z Felsite, or Felstone, a hard, compact igneous rock of somewhat flinty appearance, composed usually of quartz and orthoclase felspar intimately mixed, but sometimes of less highly siliceous minerals. The New Gresham Encyclopedia Volume 4, Part 3: Estremoz to Felspar 2011-04-14T02:00:59.373Z Hydrofluoric and boric emanations exert a profound influence on granitic rocks; their felspar is resolved into aggregates of kaolin, muscovite and quartz; tourmaline appears, largely replacing the brown mica; topaz also is not uncommon. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z Why, for instance, when you change the composition of a felspar almost imperceptibly, do the angles change? Marriage 2011-02-22T03:00:06.867Z Thus the rock-forming substances, quartz, felspar, and mica, have each a definite chemical composition. Geology 2011-02-20T03:00:12.660Z Pure felspar is colourless, but the mineral is usually white, yellow, red or green. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 "Fairbanks, Erastus" to "Fens" 2011-06-19T02:00:16.580Z At the same time orthoclase and microcline are both potassium felspars; yet the former crystallizes in the monoclinic, and the latter in the triclinic system. The New Gresham Encyclopedia Volume 4, Part 3: Estremoz to Felspar 2011-04-14T02:00:59.373Z In the weathering of granite the quartz suffers little change; the felspar passes into dull cloudy, soft aggregates of kaolin, muscovite and secondary quartz, while chlorite, quartz and calcite replace the biotite, hornblende and augite. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z She would have it polished on one side only—the other should be rough to show the felspar in its natural state.... Marriage 2011-02-22T03:00:06.867Z It is not so common a constituent of rocks as either of the other felspars just referred to. Geology 2011-02-20T03:00:12.660Z The high translucency of “ivory porcelain” depends on the large proportion of felspar in the body. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 "Fairbanks, Erastus" to "Fens" 2011-06-19T02:00:16.580Z The essential minerals, hornblende and felspar, rarely show crystalline outlines, and this is generally true also of the others. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6 "English Language" to "Epsom Salts" 2011-02-19T03:00:59.807Z Though occasionally we may find larger grains of felspar, quartz or epidote, it is more characteristic of these rocks that all the minerals are in small, nearly uniform, imperfectly shaped individuals. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z The rutile is invariably in small brown prisms; the kyanite forms bladed crystals, with perfect cleavage; felspar, if present, belongs to basic varieties rich in lime. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward" 2011-01-19T03:00:19.027Z Basalt is a dark or almost black compact homogeneous rock, composed of felspar and augite with magnetic iron. Geology 2011-02-20T03:00:12.660Z Among the applications of felspar is that of pure orthoclase in the manufacture of artificial teeth. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 "Fairbanks, Erastus" to "Fens" 2011-06-19T02:00:16.580Z EPIDIORITE, in petrology, a typical member of a family of rocks consisting essentially of hornblende and felspar, often with epidote, garnet, sphene, biotite, or quartz, and having usually a foliated structure. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6 "English Language" to "Epsom Salts" 2011-02-19T03:00:59.807Z It passes through various shades of colour, from white to yellow, green, blue, and occasionally red, scratches fluor-spar but is scratched by felspar, and has a specific gravity of about 3.5. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli Quartz also is usually present in these rocks, but felspar is rare. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward" 2011-01-19T03:00:19.027Z In foliated rocks, the minerals are chiefly quartz, felspar, and mica, talc, or chlorite. Geology 2011-02-20T03:00:12.660Z All the felspars are silicates containing aluminium with some other metallic base or bases, generally potassium, sodium or calcium, rarely barium, but never magnesium or iron. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 "Fairbanks, Erastus" to "Fens" 2011-06-19T02:00:16.580Z Adula′ria, a very pure, limpid, translucent variety of the common felspar, called by lapidaries moonstone, on account of the play of light exhibited by the arrangement of its crystalline structure. The New Gresham Encyclopedia. Vol. 1 Part 1 A to Amide An�desin, a kind of felspar containing both soda and lime, and named from being first obtained in the Andes. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli Like all the felspars, it possesses two cleavages, one perfect and the other less so, here inclined to one another at an angle of 85� 50′. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" But there is still much to be learned about quartz, felspar, and mica; for, as the chemist will tell us, these are not 'elementary substances.' Geology 2011-02-20T03:00:12.660Z Vitreous silica is less hard than chalcedony, but harder than felspar. The Methods of Glass Blowing and of Working Silica in the Oxy-Gas Flame For the use of chemical and physical students This is remarkably white and pure, as though derived from white felspar, like the China clay in Cornwall. The Geological Story of the Isle of Wight Andesite is often porphyritic in character, with large crystals of felspar scattered through it. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli They consist essentially of plagioclase felspar, with hornblende or augite, and may contain also biotite, quartz and a limited amount of orthoclase. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" And so on with mica and felspar, and every other mineral. Geology 2011-02-20T03:00:12.660Z Sometimes the felspar is brownish-red, and the rock not unfrequently contains disseminated augite? Narrative of a Second Expedition to the Shores of the Polar Sea A variety of trap, composed of hornblende and felspar. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Cassiterite occurs as a pseudomorph after orthoclase felspar in some of the altered granite of Cornwall, and it has occasionally been found as a cementing material in certain brecciated lodes. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" Still another mode of occurrence is presented by beautifully developed and transparent crystals found with crystals of felspar and quartz lining the crevices in the gneiss of the Alps. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" It often occurs as a constituent of granite, not unfrequently being associated in the same rock with pink felspar or orthoclase. Geology 2011-02-20T03:00:12.660Z The trap-rock, whose fragments strewed the valley, consists of felspar, deeply coloured by hornblende. Narrative of a Second Expedition to the Shores of the Polar Sea The term is hence applied to every species of unstratifled rock in which detached crystals or felspar or some other mineral are diffused through a base of other mineral composition. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology They contain a small amount of quartz, and often micropegmatite, as the last element to consolidate, filling up little angular interspaces between the felspars and pyroxenes, which had previously crystallized. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 "Dodwell" to "Drama" The ferromagnesian minerals crystallize comparatively early and have some idiomorphism; the felspar usually follows and only in part shows good crystalline outlines. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" When mica or felspar occurs plentifully, we have, in the one case, micaceous sandstone, and in the other felspathic sandstone. Geology 2011-02-20T03:00:12.660Z The porphyry has a compact basis, like hornstone, of a dull brown colour, which contains imbedded crystals of felspar and quartz, and occasionally of augite. Narrative of a Second Expedition to the Shores of the Polar Sea A variety of lava essentially composed of glassy felspar, and frequently having detached crystals of felspar in the base or body of the stone, giving it the structure of porphyry. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Their essential minerals are those of basalt, viz. olivine, augite and plagioclase felspar, while hornblende, ilmenite, apatite and biotite are their commonest accessory ingredients. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 "Dodwell" to "Drama" In many diorites the plagioclase felspar has crystallized before the hornblende, which consequently has less perfect outlines and forms irregular plates which enclose sharply formed individuals of felspar. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" Subdivisions.—In their chemical and mineralogical composition, igneous rocks offer great variety; but they all agree in having felspar for their base. Geology 2011-02-20T03:00:12.660Z The mica is mostly black in all the granite boulders that occur here, the felspar most frequently reddish. Narrative of a Second Expedition to the Shores of the Polar Sea The term is as old as the time of Pliny, and was applied to a red rock with small, angular, white bodies diffused through it, which are crystallized felspar, brought from Egypt. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology The commonest type of structure in dolerite is the ophitic, which results from the felspar of the rock having crystallized before the augite; the latter mineral forms shapeless masses in which the idiomorphic felspars lie. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 "Dodwell" to "Drama" The hornblendites differ from the diorites in containing little felspar, and consist principally of hornblende. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" Under the microscope a tolerably thin section shows the outlines of felspar crystals, lying in a hazy milk-white semi-opaque granular matrix. Etna A History of the Mountain and of its Eruptions The larger or “nut” sizes, from � in. upwards, are washed on plain sieve plates, but for finer-grained duff the sieve is covered with a bed of broken felspar lumps about 3 in. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" In common felspar the alkali is potash; in another variety, called Albite or Cleavlandite, it is soda. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology These sediments are fine and tenacious; their principal components, in addition to clay, being small grains of quartz, zircon, tourmaline, hornblende, felspar and iron compounds. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" The felspar of the diorites ranges in composition from oligoclase to labradorite, and is often remarkably zonal, the external layers being more alkaline than the internal. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" The felspar crystals are lighter and more translucent than the matrix, but are of much the same character, having a granulated or flocculent appearance, somewhat like that of the decomposed felspars in diabase. Etna A History of the Mountain and of its Eruptions Andesite.—This is a dark-coloured, compact or vesicular, semi-vitreous group of volcanic rocks, composed essentially of a glassy plagioclase felspar, and a ferro-magnesian constituent enclosed in a glassy base. Volcanoes: Past and Present It is usually composed of three simple minerals, felspar, quartz, and mica, and derives its name from having a coarse granular structure; granum, Latin for grain. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology The felspar decomposes into kaolin and quartz; its alkalis are for the most part set free and removed in solution, but are partly retained in the white mica which is constantly found in crude china-clays. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" In Book Second, Chapter III, "felspar" was changed to "feldspar". Timar's Two Worlds Sections of Etna Lavas seen under the Microscope Plagioclastic felspars are unquestionably the dominant constituents of these lavas. Etna A History of the Mountain and of its Eruptions He wrote specially on the means of determining the different felspars. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 2 "Demijohn" to "Destructor" One of the varieties of the Trap-rocks, composed of augite and felspar. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology The alkalis are very interesting; often they form 5 or 10% of the whole rock; they indicate abundance of white micas or of undecomposed particles of felspar. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" In the later stages of alteration the amphibole becomes compact and well crystallized; the rocks consist of green hornblende and plagioclase felspar, and are then generally known as epidiorites or amphibolites. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3 "Destructors" to "Diameter" The vitreous matter which occurs in these lavas is principally present in the form of inclosures in the felspar, and, sometimes, the augite and olivine crystals previously described. Etna A History of the Mountain and of its Eruptions It has eyes of green felspar cemented in with resin. Boy Scouts Handbook The First Edition, 1911 It is a dark green or black stone, composed of augite and felspar, very compact in texture, and of considerable hardness, often found in regular pillars of three or more sides called basaltic columns. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology It consists of very fine scaly kaolin, larger, shining plates of white mica, grains of quartz and particles of semi-decomposed felspar, tourmaline, zircon and other minerals, which originally formed part of the granite. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" But transition forms are very common, having more or less of the augite remaining, surrounded by newly formed hornblende which at first is rather fibrous and tends to spread outwards through the surrounding felspar. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3 "Destructors" to "Diameter" The felspar microliths, which constitute so large a proportion of the ground-mass in the Etna lavas, are in most instances probably triclinic. Etna A History of the Mountain and of its Eruptions They are chiefly made of crystals of various minerals, such as quartz, felspar, mica, and pyrite. Boy Scouts Handbook The First Edition, 1911 The white angular portions in granite are felspar. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology In addition to the reddish or brownish argillaceous matrix it contains fresh or decomposed crystals of volcanic minerals, such as felspar, augite, hornblende, olivine and pumiceous or palagonitic rocks. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" The minerals of diabase are the same as those of dolerite, viz. olivine, augite, and plagioclase felspar, with subordinate quantities of hornblende, biotite, iron oxides and apatite. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3 "Destructors" to "Diameter" Monoclinic felspar does, however, occur in some of these rocks; but the difficulty of ascertaining the precise character of microliths renders it unsafe to speculate on the amount of sanidine which may be present. Etna A History of the Mountain and of its Eruptions Granite often contains large crystals of felspar or mica. Boy Scouts Handbook The First Edition, 1911 Glassy felspar is a term applied when the crystals have a considerable degree of transparency. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology The Minerals are most abundant, and amongst these may be reckoned quartz, porphyry, felspar, malachite, manganese, and basalt. Blackwood's Edinburgh Magazine, Volume 58, Number 360, October 1845 This range consists of granite, with ramifications of schist, and large masses of quartz, mica, and felspar. Rambles in the Islands of Corsica and Sardinia with Notices of their History, Antiquities, and Present Condition. The ground mass was found to consist of felspar microliths, and grains of olivine, augite, and magnetite, with some interstitial glass. Etna A History of the Mountain and of its Eruptions Among the mineral productions is a kind of felspar, which, when polished, exhibits a display of brilliant and beautiful colours. Travels in North America, From Modern Writers With Remarks and Observations; Exhibiting a Connected View of the Geography and Present State of that Quarter of the Globe Compact felspar is a name of more vague signification. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology The plagioclase felspar, if fresh, is transparent and appears simple in ordinary light, but when polarized breaks up into a series of bars of different colours owing to its complex twinned structure. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 3 "Banks" to "Bassoon" Other kinds of felspar, even orthoclase, may however also show the aventurine appearance. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 "Austria, Lower" to "Bacon" On the floor of the square well lay a fragment of a flint bracelet, and some pieces of green felspar, alabaster, and malachite. El Kab According as the base potash, soda, or lime predominates, the felspar is known as Orthoclase, Albite, and Oligoclase, respectively. Manures and the principles of manuring Volcanic rocks composed of felspar, augite, and hornblende. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology If nepheline entirely replaces felspar, the rock is known as nepheline-basalt; if the replacement is only partial the term nepheline-basanite is used. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 3 "Banks" to "Bassoon" Structurally, therefore, these isles are a continuation of Land's End, but the granite has become less consistent and more friable; it is largely broken into felspar, quartz, and mica, with schorl, chlorite, and hornblende. The Cornwall Coast In green felspar there were small flat discs, hawks, and hippopotamus heads. El Kab The felspars are composed of silica and alumina, along with potash, soda, and lime, with traces of iron and magnesia. Manures and the principles of manuring Mineral composition of volcanic products.—The mineral called felspar forms in general more than half of the mass of modern lavas. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Basalt is an igneous rock composed largely of augite and felspar, which are silicate crystals of calcium, potassium, alumina, etc., of which the Moonstone is a variety. Second Sight A study of Natural and Induced Clairvoyance The west arm of the pier is built on a vein of felspar porphyry, visible at low water. The Cornwall Coast It is usually rich in potash, the predominating felspar being orthoclase, but somewhat deficient in nitrogen and phosphoric acid. Fruits of Queensland The uppermost, known technically as chuca, is of a friable nature, and consists of sand and gypsum; while the lower, the costra, is a rocky conglomerate of clay, gravel, and fragments of felspar. Manures and the principles of manuring There is great similarity in the composition of the ancient and modern lavas of Etna, both consisting of felspar, augite, olivine, and titaniferous iron. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Their number is by no means large, and they all consist of mixtures in variable proportions of quartz, felspar, mica, hornblende, augite, and zeolites. Elements of Agricultural Chemistry The ice of our winters, and of our polar regions, is its handiwork, and so also are the quartz, felspar, and mica of our rocks. Fragments of science, V. 1-2 “Only very fine, hard granite, with scarcely a grain of felspar,” he said. The Crystal Hunters A Boy's Adventures in the Higher Alps A volcanic rock known as palagonite, and that most commonly occurring of all potash minerals—viz., felspar—have both been experimented with in this way with considerable success. Manures and the principles of manuring This elastic fluid has the property of decomposing many of the hardest rocks with which it comes in contact, particularly that numerous class in whose composition felspar is an ingredient. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology The four kinds of felspar which have been already named are compounds of silica with alumina, and another base which is either potash, soda, or lime. Elements of Agricultural Chemistry Thus an ore containing a large proportion of fluor-spar may with great advantage be employed to flux another containing felspar or quartz, which substances are almost infusible alone. Chambers's Edinburgh Journal, No. 458 Volume 18, New Series, October 9, 1852 They had been to a spot twenty miles south-east of the Van Diemen's Land Company's establishment, whither they were accustomed to resort for a mineral, which is found in a decomposed bed of felspar. The History of Tasmania , Volume II That felspar should prove, when finally ground, a valuable source of potash, is not to be wondered at when we remember that some varieties of it contain over 16 per cent. Manures and the principles of manuring The last-mentioned mineral contains soda instead of the potash found in common felspar. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology This decomposition of felspar is the source of the great deposits of clay which are so abundantly distributed over the globe, and it takes place with nearly equal rapidity with potash and soda felspar. Elements of Agricultural Chemistry What lovely pictures you would have made in the old butterfly times, of opal and felspar! Hortus Inclusus Messages from the Wood to the Garden, Sent in Happy Days to the Sister Ladies of the Thwaite, Coniston Gwyn took out his knife, and began to pick with the point at a large crystal of pinkish felspar, which stood partly out of the huge block of granite. Sappers and Miners The Flood beneath the Sea Some idea of the enormous potential fertility of a soil containing felspar, so far as potash is concerned, may be obtained from this statement. Manures and the principles of manuring Vesuvian minerals.—A great variety of minerals are found in the lavas of Vesuvius and Somma; augite, leucite, felspar, mica, olivine, and sulphur are most abundant. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Owing to the small quantity of felspar which it contains, and the abundance of the difficulty decomposable mica, the soils formed by its disintegration are generally inferior. Elements of Agricultural Chemistry And now, look here, I have paid at least a hundred visits to the vein you showed me—the decomposing felspar vein.” Menhardoc The boys settled themselves in uncomfortable positions on the narrow top, where the felspar crystals stood out at uncomfortable angles, and those of quartz were sharper still, and prepared for their long confab. Sappers and Miners The Flood beneath the Sea This change may be illustrated by quoting the analysis of a kaolin clay formed by the disintegration of orthoclase felspar. Manures and the principles of manuring This lava ran quite down to the sea—a distance of about two miles; in color it varies from iron-gray to reddish black, and is remarkable for the glassy felspar which it contains. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Granite is a mixture of quartz, felspar, and mica in variable proportions, and the quality of the soil it yields depends on whether the variety of felspar present be orthoclase or albite. Elements of Agricultural Chemistry It is formed of grains of quartz, mica the shiny, and felspar, that soft white creamy stone like our old alley marbles. Menhardoc At length I came upon one—a flake of felspar of a dull cream-color—hollowed enough on one side to hold a pint or upwards. Left on Labrador or, The cruise of the Schooner-yacht 'Curlew.' as Recorded by 'Wash.' It depends on the felspar present—i.e., whether it is orthoclase, oligoclase, or albite—whether the soil will be rich in potash or not. Manures and the principles of manuring The industries include the manufacture of fine pottery, and of so-called porcelain buttons made of felspar and milk by a special process; its inventor, Bapterosses, has a bust in the town. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Mica slate is also a mixture of quartz, felspar, and mica, but consisting almost entirely of the latter ingredient, and consequently presenting an extreme infertility. Elements of Agricultural Chemistry The surrounding country consists almost entirely of coarse grained granite, frequently enclosing large masses of reddish felspar. Narrative of a Journey to the Shores of the Polar Sea, in the Years 1819-20-21-22, Volume 1 By these it is distinguished from felspar and similar minerals, which it somewhat resembles in general appearance. A Text-book of Assaying: For the Use of Those Connected with Mines. Granite containing orthoclase felspar produces a fairly fertile soil. Manures and the principles of manuring All clays contain more or less free silica in the form of sand, and usually a small percentage of undecomposed felspar. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The purest clays are produced by the decomposition of felspar, but almost all the crystalline rocks may produce them by the removal of their alkalies, iron, lime, etc. Elements of Agricultural Chemistry The rock is of trap, greenstone, or whinstone, which miners call iron-stone and Cornishmen 'blue elvan:' this diorite, composed of felspar and the hardest hornblende, contains granular iron and pyrites like silver. To The Gold Coast for Gold, Vol. II A Personal Narrative It is, that though the predominant felspar in them is always of the basic type, yet they not unfrequently contain free quartz, sometimes in very large proportion. Round About the Carpathians Gneiss, another common rock, is similar in composition, only that it contains very little felspar, and a correspondingly greater amount of mica. Manures and the principles of manuring We had granite again to-day, and fine beds of felspar, pebbles, and rocks. Narrative of a Mission to Central Africa Performed in the Years 1850-51, Volume 1 Under the Orders and at the Expense of Her Majesty's Government Some rivulets had a tinge of white in them, as if of felspar in disintegrating granite; some nearly stagnant burns had as if milk and water in them, and some red oxide of iron. The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume I (of 2), 1866-1868 Now we sometimes see zircons in felspars and in quartz, etc., but in no such case is a halo produced. The Birth-Time of the World and Other Scientific Essays It has a base of dark green with angular crystals of felspar of a lighter green imbedded in it. Roman Mosaics Or, Studies in Rome and Its Neighbourhood It must be remembered, however, that it is only the orthoclase or potash felspars which contain large quantities of potash—other felspathic rocks, such as oligoclase and labradorite, being comparatively poor in it. Manures and the principles of manuring Then there are many varieties of this stone, and others springing out of granite, as quartz rocks and felspar, and some sandstone mixed with quartz. Narrative of a Mission to Central Africa Performed in the Years 1850-51, Volume 1 Under the Orders and at the Expense of Her Majesty's Government The belt-buckles, angles, and head-rests in red jasper, carnelian, and hematite, are, on the contrary, finished to the minutest details, notwithstanding that carnelian and red jasper are even harder than green felspar. Manual of Egyptian Archaeology and Guide to the Study of Antiquities in Egypt Some few of the grains are of chalky-looking felspar; again a granitic mineral. The Birth-Time of the World and Other Scientific Essays In the Egyptian breccia are found very fine pebbles of red granite, porphyry of a darker or lighter green, and yellow quartz, held together by a cement of compact felspar. Roman Mosaics Or, Studies in Rome and Its Neighbourhood You have there what mineralogists call quartz, you have felspar, you have mica. Six Lectures on Light Delivered In The United States In 1872-1873 In this case also are the Aluminates of Magnesia, including the sapphirine; the chrysoberyls from Brazil, and those inclosed in quartz and felspar with garnets. How to See the British Museum in Four Visits Lapis lazuli is insufficiently homogeneous, almost as hard as felspar, and seems as if it were incapable of being finely worked. Manual of Egyptian Archaeology and Guide to the Study of Antiquities in Egypt The porphyry, which is of warm brown or chocolate colour, includes many crystals of lighter coloured felspar, and dark crystals of hornblende. Gold, Sport, and Coffee Planting in Mysore The oxide of iron thus produced communicates its colouring to the laterite, and in proportion as felspar and hornblende abound in the gneiss, the cabook assumes respectively a white or yellow hue. Ceylon; an Account of the Island Physical, Historical, and Topographical with Notices of Its Natural History, Antiquities and Productions, Volume 1 The surrounding country consists almost entirely of coarse-grained granite, frequently enclosing large masses of reddish felspar. The Journey to the Polar Sea We found that the beryls occurred in a very coarse granite, where the quartz appeared in masses and the felspar in huge crystals. Lippincott's Magazine of Popular Literature and Science Volume 11, No. 27, June, 1873 Others are for wearing on the wrist, like the bracelets of modern ladies, and are made of small beads in gold, lapis lazuli, carnelian, and green felspar. Manual of Egyptian Archaeology and Guide to the Study of Antiquities in Egypt During our day's journey I found grey porphyry, the base consisting apparently of granular felspar with embedded crystals of common felspar and grains of hornblende. Three Expeditions into the Interior of Eastern Australia, Volume 2 One, named Einerguendi by Brown, consisted of compact felspar, coloured green by chlorite, with grains of quartz and acicular crystals of felspar. Three Expeditions into the Interior of Eastern Australia, Volume 1 The rock in the immediate neighbourhood of Cape York is a porphyry with soft felspathic base, containing numerous moderately-sized crystals of amber-coloured quartz, and a few larger ones of flesh-coloured felspar. Narrative of the Voyage of H.M.S. Rattlesnake, Commanded By the Late Captain Owen Stanley, R.N., F.R.S. Etc. During the Years 1846-1850. Including Discoveries and Surveys in New Guinea, the Louisiade Archipelago, Etc. to Which Is Added the Account of Mr. E.B. Kennedy's Expedition for the Exploration of the Cape York Peninsula. By John Macgillivray, F.R.G.S. Naturalist to the Expedition. — Volume 1 At Royalston we observed them to spring seemingly from the felspar and project into smoky quartz, becoming more transparent as they advanced into the harder stone. Lippincott's Magazine of Popular Literature and Science Volume 11, No. 27, June, 1873 The legend of Ahmes is inlaid thereon in characters of lapis lazuli, carnelian, turquoise, and green felspar. Manual of Egyptian Archaeology and Guide to the Study of Antiquities in Egypt It consisted of a variety of the same quartz rock as Wallangome, but contained pebbles of laminated compact felspar. Three Expeditions into the Interior of Eastern Australia, Volume 2 The part of the river adjacent to this spot was fordable, the bed consisting of a variety of sandstone composed of small siliceous grains cemented by decomposed felspar. Three Expeditions into the Interior of Eastern Australia, Volume 1 This is a small, high, rocky island, of flesh-coloured compact felspar. Narrative of the Voyage of H.M.S. Rattlesnake, Commanded By the Late Captain Owen Stanley, R.N., F.R.S. Etc. During the Years 1846-1850. Including Discoveries and Surveys in New Guinea, the Louisiade Archipelago, Etc. to Which Is Added the Account of Mr. E.B. Kennedy's Expedition for the Exploration of the Cape York Peninsula. By John Macgillivray, F.R.G.S. Naturalist to the Expedition. — Volume 1 Indistinct specimens, apparently consisting of decomposed compact felspar. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 This clay is not fusible by the highest heat of our furnaces, though the felspar, from the decomposition of which it is derived, forms a spongy milk-white glass, or enamel, at a low white heat. The Mirror of Literature, Amusement, and Instruction Volume 19, No. 548, May 26, 1832 This hill consisted of immense blocks of common granite composed of white felspar and quartz and black mica; and it appeared to form the western extremity of a low range. Three Expeditions into the Interior of Eastern Australia, Volume 2 To the north-west, in a hollow containing water which drains from beneath the part ignited, is a coarse sandstone, in some places highly charged with decomposed felspar, and containing impressions of spirifers. Three Expeditions into the Interior of Eastern Australia, Volume 1 The sedimentary deposits within the influence of the volcanic action have passed through considerable changes, the sandstone having become granitic quartz rock, chiefly composed of pure white quartz with particles of decomposed felspar. What to See in England A Guide to Places of Historic Interest, Natural Beauty or Literary Association A compound of quartz, mica, and felspar, having the appearance of re-composed granite. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 Obviously, at each step the percentage of felspar and phosphorus is less and less until in the final concentrates the percentage of iron oxide is 91 to 93 per cent. Edison, His Life and Inventions The rock consisted of a base of compact felspar with embedded grains of quartz, giving to some parts the character of conglomerate, and there were also embedded crystals of common felspar. Three Expeditions into the Interior of Eastern Australia, Volume 2 The road crosses it at the very lowest part, and where the rock consists of a dark grey felspar with grains of quartz. Three Expeditions into the Interior of Eastern Australia, Volume 1 Its essential constituents are felspar, quartz and riebeckite—a soda amphibole. The Project Gutenberg Encyclopedia Volume 1 of 28 A reddish granitic stone, composed of quartz, felspar, and tourmaline. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 It was composed of black and vitreous lava, mixed with fragments of felspar. Twenty Thousand Leagues under the Sea A remarkably projecting ridge on the banks of Peel's river contained limestone of so peculiar an aspect as to resemble porphyry, and it was associated with a rock having a base of chocolate-coloured granular felspar. Three Expeditions into the Interior of Eastern Australia, Volume 2 In the soil here the only rock I found was a large, hard boulder, being a conglomerate of pebbles and grains of quartz, cemented by decomposed felspar or clay. Three Expeditions into the Interior of Eastern Australia, Volume 1 Like all the felspars it possesses two cleavages, one perfect and the other less so, which are here inclined at an angle of 86 deg. The Project Gutenberg Encyclopedia Volume 1 of 28 Compact felspar, of a flesh-red colour; very nearly resembling that of the Percy Islands, above-mentioned. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 Fragments of conglomerate rocks appeared in the soil of the plains, pebbles and grains of quartz cemented by felspar. Journal of an Expedition into the Interior of Tropical Australia This eminence, which I distinguished as Mount Stavely, consisted apparently of decomposed clay-stone or felspar, having a tendency to divide naturally into regular prisms. Three Expeditions into the Interior of Eastern Australia, Volume 2 There were also pebbles of a quartzose conglomerate, and others of decomposed porphyry, the base consisting of granular felspar, with crystals of common felspar. Three Expeditions into the Interior of Eastern Australia, Volume 1 Aventurine and moonstone varieties occur, though these special appearances are more usually displayed by the oligoclase and orthoclase felspars respectively. The Project Gutenberg Encyclopedia Volume 1 of 28 The specimens, in Mr. Brown's collection from this place, consist of coarse-slaty porphyritic conglomerate, with a base of greenish-grey compact felspar, containing crystals of reddish felspar and quartz. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 At one turn, denuded rocks appeared in its bed, consisting of ironstone in a whitish cement or matrix, which might have been decomposed felspar. Journal of an Expedition into the Interior of Tropical Australia On the summit I found hornstone and granular felspar. Three Expeditions into the Interior of Eastern Australia, Volume 2 It is at this point in general finely grained, but the felspar partly decomposed, with distinct crystals of felspar unchanged. Three Expeditions into the Interior of Eastern Australia, Volume 1 At last they came to hard granite close in grain, and containing garnets and felspar crystals, which flew out with every stroke of the pickaxe. The Field of Ice Part II of the Adventures of Captain Hatteras A small island, near Cape Arnhem, is also composed of granite, in which the felspar has a bluish hue. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 These consisted chiefly of quartz, felspar, and a silicious petrifaction of woody appearance. Journal of an Expedition into the Interior of Tropical Australia The lower parts of the same country, according to the rocks seen in Yalwal creek, consist of granite, basalt, and compact felspar. Three Expeditions into the Interior of Eastern Australia, Volume 2 The summit of this hill consists of a dark grey felspar. Three Expeditions into the Interior of Eastern Australia, Volume 1 The well known mineral felspar has a specific gravity intermediate between that of the coal and the shale, or stone, with which it is found intermixed. Scientific American Supplement, No. 417, December 29, 1883 A sienitic compound, consisting of a large proportion of reddish felspar, with specks of a green substance, probably mica; resembling a rock from Shap in Cumberland. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 The rock consisted of that found about the basin of the Darling; a quartzose conglomerate with much felspar, and having pebbles of quartz imbedded. Journal of an Expedition into the Interior of Tropical Australia After travelling five miles over tolerable land we crossed a range of very fine-grained granite consisting of felspar, quartz, and small particles of mica and having a very crystalline aspect. Three Expeditions into the Interior of Eastern Australia, Volume 2 One of these was about a mile to the east of our camp and consisted of hardish sandstone, composed of grains of quartz, without any apparent cement, but containing a small quantity of decomposed felspar. Three Expeditions into the Interior of Eastern Australia, Volume 1 Glittering Labrador stones, and many other kinds of felspar, red, green, and blue, were sprinkled on the unfrequented beach, with grey and yellow pummice-stone, and lustrous variegated obsidian. The Fur Country Seventy Degrees North Latitude Compact felspar of a flesh-red hue, enclosing a few small crystals of reddish felspar and of quartz. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 A gutter leads from the mouth, showing signs of water-wear, and the blocks of trachyte are so loaded with glossy white felspar that I attempted to dust them before sitting down. To the Gold Coast for Gold A Personal Narrative in Two Volumes.—Volume I Nearer the coast a friable whitish sandstone affords but a poor soil, except where the partial occurrence of decomposed laminated felspar and gneiss produced one somewhat better. Three Expeditions into the Interior of Eastern Australia, Volume 2 This consists of a dark mottled trap with crystals of felspar. Three Expeditions into the Interior of Eastern Australia, Volume 1 The porphyry is of a red-brown colour, consisting of grey paste with crystal of felspar and angular fragments of slate and granite sometimes one foot in length. Journals of Australian Explorations This specimen is marked "general character of the rocks at Percy Island," and very much resembles the compact felspar of the Pentland Hills near Edinburgh, and of Saxony. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 Most of them contained crystals of felspar and pyroxene. To the Gold Coast for Gold A Personal Narrative in Two Volumes.—Volume I The reefs at Portland Bay consist of the same rock in rounded nodules, a more compact trap-rock consisting principally of felspar lying above them, as was observable in the section of the coast. Three Expeditions into the Interior of Eastern Australia, Volume 2 It consisted of a very hard conglomerate composed of irregular concretions of milk-white quartz, in a ferruginous basis, with apparently compact felspar weathering white. Three Expeditions into the Interior of Eastern Australia, Volume 1 Does he know why the twenty- sixth chapter of the 'Book of the dead' was written upon lapis-lazuli, the twenty-seventh upon green felspar, the twenty-ninth upon cornelian, and the thirtieth upon serpentine? Bat Wing Dark grey porphyritic hornstone, approaching to compact felspar, with imbedded crystals of felspar. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 Some beds consist of an impalpable mud, like putty, apparently derived from the grinding down of felspar, and resembling the mud produced by the grinding action of modern glaciers. The Antiquity of Man The hill was composed of granular felspar in a state of decomposition; the surrounding country consisting chiefly of very fine-grained sandstone. Three Expeditions into the Interior of Eastern Australia, Volume 2 The range that we had ascended consisted of porphyry, having a base of fawn-coloured compact felspar, with grains of quartz, and crystals of common felspar. Three Expeditions into the Interior of Eastern Australia, Volume 1 The rock was found by Watson to be gneiss, rich in mica, felspar and garnets. The Home of the Blizzard Being the Story of the Australasian Antarctic Expedition, 1911-1914 Grey granite, consisting of brown and white mica, quartz, and a large proportion of felspar somewhat decomposed. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 The rock of Campbell's Peak is domitic; at the top it is of a bluish colour and very hard, and contains very visible, though minute, crystals of felspar. Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845 This hill had a very remarkable feature--a deep chasm separating it from the ridge behind, the sides being so steep as to present a section of the trap-rock which consisted principally of compact felspar. Three Expeditions into the Interior of Eastern Australia, Volume 2 This hill consisted of a rock resembling felspar, and was connected with the former, which was of granite, by low hills consisting of schistus and trap. Three Expeditions into the Interior of Eastern Australia, Volume 1 He knew a vast deal about cairngorms and agates and such-like pretty things, and showed Charles quartz and felspar and red cornelian, and I don't know what else, in the crags on the hillside. An African Millionaire Episodes in the Life of the Illustrious Colonel Clay Granite, composed of grey and somewhat bluish felspar, dark brown mica, and a little quartz; containing minute disseminated specks of molybdena, and indistinct crystals of pale red garnet. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 Repulse Island produced a compact felspar--a compound of quartz, mica, and felspar, having the appearance of decomposed granite. Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845 The rock is trap consisting principally of felspar; and the soil is excellent as was amply testified by the luxuriant vegetation in Mr. Henty's garden. Three Expeditions into the Interior of Eastern Australia, Volume 2 Beneath these wild and craggy fortresses of nature a shining stretch of beach had formed itself, on which the fine white sand, mixed with crushed felspar, sparkled like powdered silver. Thelma Thus she contrives to intenerate the granite and felspar, takes the boar out and puts the lamb in and keeps her balance true. Essays — First Series Fragment, apparently from a columnar mass, of a stone intermediate between clink-stone and compact felspar. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 The whole country from the large flat to our camp, was composed of felspathic porphyry, containing crystals of felspar, and accidentally of quartz, in a paste varying in colour and hardness. Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845 The Minerals are most abundant, and among these may be reckoned quartz, porphyry, felspar, malachite, manganese, and basalt. Stories by English Authors: Scotland (Selected by Scribners) GRANITE.—A rock consisting essentially of crystals of felspar and mica in a mass of quartz. The Origin of Species by means of Natural Selection, 6th Edition The second stratum was granite DISINTEGRATED; aqueous vapor, having been produced in such abundance as to be enabled to rise upward, partially disintegrating the crystals of felspar and mica, and superficially dissolving those of quartz. A History of Science — Volume 3 The rock was still granitic, with small outbreaks of basalt; the leaflets of white mica were visible everywhere in the soil and in the large ant-hills, whose building materials were derived from the decomposed felspar. Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845 Another rock was composed of felspar and large leaflets of white mica, or of quartz and white mica. Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845 A larger range to the southward of it was also porphyritic, very hard, as if penetrated by quartz, and containing small crystals of flesh-coloured felspar. Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845 Its higher part was composed of sandstone and conglomerate; but a coarse-grained granite, with much quartz and felspar, but little mica and accidental hornblende, was below. Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845 |
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