| 单词 | siliceous |
| 例句 | Because this style of siliceous fossilization extends long before and after the Ediacaran, the biota’s appearance—and disappearance—were not just an accident of the fossil record, Tarhan says. How Earth’s oldest animals were fossilized 2016-10-19T04:00:00Z M. Travers has suggested that it may explain the liberation of helium from minerals by heat, the gas being enabled to permeate the siliceous materials in which it is enclosed. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z The Reading beds consist of mottled and yellow clays and sands, the latter are frequently hardened into masses made up of pebbles in a siliceous cement, known locally as Hertfordshire puddingstone. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z Lydian stone, or black jasper, a variety of siliceous or flinty slate, of a grayish or bluish black color. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z Geologically the materials are called novaculites, and are supposed to be metamorphosed sandstone silt, chert or limestone resulting from the permeation through the mass of heated alkaline siliceous waters. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z The more argillaceous and the less siliceous the soil the more readily can balls of earth be retained about the roots. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 7 "Horticulture" to "Hudson Bay" 2012-03-04T03:00:13.390Z The hard ore is siliceous, and fine crystallized specimens occur in association with smoky quartz. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z It is, however, only a modification of the Bessemer process to the extent of substituting for the siliceous or 'acid' lining generally used, a lime or 'basic' lining for the converter. The Romance of Industry and Invention 2011-12-19T03:00:43.870Z Accident or the funeral pyre may have suggested the extraordinary durability the clay shape obtained when burned, and doubtless siliceous glazes were first the result of chance. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z When water is boiled for a long time in a glass vessel a considerable quantity of white siliceous earth is found in the vessel. Heroes of Science Chemists 2011-12-09T03:00:21.047Z The cementing material may be siliceous or argillaceous, and is sometimes calcareous. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 5 "Greek Law" to "Ground-Squirrel" 2011-12-05T03:00:51.527Z Origin of the sandstone and limestone.—The sandstone of the region, known as the Potsdam sandstone, consists of medium sized grains of sand, cemented together by siliceous, ferruginous, or calcareous cement. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z Professor W. A. Carlyle informs us that the ore worked must have been almost exclusively sulphides, as only negligible quantities of carbonates exist in the deposits; they probably mixed basic and siliceous ores. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z Most of the arrow-heads and a good many of the knives were made of a dark reddish siliceous rock. Alone with the Hairy Ainu or, 3,800 miles on a pack saddle in Yezo and a cruise to the Kurile Islands. 2011-10-30T02:00:10.270Z With about equal weights of alkali and siliceous sand is made glass, of so great use in admitting light and excluding the weather from our houses, as well as for making various useful utensils. Heads of Lectures on a Course of Experimental Philosophy: Particularly Including Chemistry 2011-10-11T02:01:05.817Z The deposition of the sinter is due in part to the cooling and evaporation of the siliceous waters, and in part to the presence of living algae. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 8 "Germany" to "Gibson, William" 2011-10-05T02:00:17.763Z They contain a small quantity of carbonic acid gas, and also of azotic gas; some sulphate of soda, and muriate of soda; selenite, carbonate of lime; siliceous earth; and a portion of oxyd of iron. Curiosities of Great Britain: England and Wales Delineated Vol.1-11 Historical, Entertaining & Commercial; Alphabetically Arranged. 11 Volume set. 2011-09-26T02:00:29.140Z The materials which ancient artists used for cutting into cameos were chiefly those siliceous minerals which, under a variety of names, present various strata or bands of two or more distinct colours. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z They extend back beyond the Carboniferous, where they occur as hyphae, &c., preserved in the fossil woods, but the best specimens are probably those in amber and in siliceous petrifactions of more recent origin. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z His first scientific discovery was the detection of siliceous earth in the outer coating of reeds and grasses. Triumphs of Invention and Discovery in Art and Science 2011-07-19T02:00:21.280Z The next is of a red clay, and is four or five feet thick, and less mixed with similar siliceous substances. Scenes and Andventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas 2011-07-10T02:00:18.883Z The siliceous part of it may be used in forming spicules. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z The design of it was to exhibit the application of chemistry to the arts in the fusion of siliceous and alkaline substances in the production of enamels, glass, etc. The International Monthly, Volume 3, No. 3, June, 1851 2011-05-18T02:00:14.897Z Ganister, a slightly plastic siliceous sand, is similarly used for the lining of Bessemer steel converters; it is found in the neighbourhood of Sheffield. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z It flourishes best in siliceous soils, and is not found in the Jura and Swiss Alps. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 7 "Fox, George" to "France" 2011-05-15T02:00:07.897Z Then comes a layer of gravel and rounded siliceous pebbles, about one foot thick, containing small portions of lead ore. Scenes and Andventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas 2011-07-10T02:00:18.883Z The food of V. bengalensis consists largely of diatoms, the siliceous shells of which often form the greater part of its excreta. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z This descent of the hard parts of organisms, both calcareous and siliceous, from the waters of the sea has led to the accumulation of a sheet of slimy sediment over almost the entire sea-bottom. North America 2011-05-05T02:00:20.027Z It is noteworthy that though of similar habitat each species selects its own size or sort of sand, some utilizing the siliceous spicules of sponges. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 "Foraminifera" to "Fox, Edward" 2011-04-22T02:00:08.637Z 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 Earths, a term applied in geology to certain loosely aggregated siliceous and aluminous materials, the detritus of pre-existing rocks. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z Where the flints lie the chalk must have been dissolved away; we have in fact a kind of metasomatic replacement in which a siliceous rock has slowly replaced a calcareous one. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z Loam, a soil composed of siliceous sand, clay, carbonate of lime, oxide of iron, magnesia, and various salts, and also decayed vegetable and animal matter. A Manual of the Antiquity of Man 2011-02-21T03:00:07.080Z Mention an instance of the abundant occurrence in the sea of animalcules with siliceous coverings and skeletons. Geology 2011-02-20T03:00:12.660Z These rocks, which include some highly siliceous lavas, form part of the Eocene series that is so conspicuously displayed above Carlingford in Co. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 5 "Arculf" to "Armour, Philip" The substance called tabasheer is a siliceous deposit that gathers at the internodes of the stems. The New Gresham Encyclopedia. Vol. 1 Part 3 Atrebates to Bedlis Some cherts contain tests of radiolaria, and correspond fairly closely to the siliceous radiolarian oozes which are gathering at the present day at the bottom of some of the deepest parts of the oceans. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z Marl, a mixed earthy substance, consisting of carbonate of lime, clay, and siliceous sand. A Manual of the Antiquity of Man 2011-02-21T03:00:07.080Z When much silica is diffused through the rock, we have a siliceous limestone; the presence of clay and of carbonaceous matter gives us argillaceous and carbonaceous limestones. Geology 2011-02-20T03:00:12.660Z Ag′ate, a semi-translucent compound mineral mass formed in the cavities of rocks by the successive deposition of various types of silica, or by the staining of a siliceous mass thus deposited along concentric zones. The New Gresham Encyclopedia. Vol. 1 Part 1 A to Amide For the preparation of metallic antimony the crude stibnite is first liquated, to free it from earthy and siliceous matter, and is then roasted in order to convert it into oxide. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" It may be siliceous or of other material. The Geological Story of the Isle of Wight The geologist may well consider what r�le osmotic growth may have played in the formation of the various rocks, siliceous, calcareous, barytic, magnesian, the fibrous and nodular rocks and atolls. The Mechanism of Life A small percentage of siliceous materials occurs in the ooze, made up partly of granules of quartz, and partly of the skeletons and coverings of minute animal and vegetable organisms. Geology 2011-02-20T03:00:12.660Z Changed "silicious" to "siliceous" on page 143: "filled with siliceous sand." The Eruption of Vesuvius in 1872 The subformations of the country being chiefly composed of sandstone and porous calcareous and siliceous rocks, renders the thin soils on these higher tracts extremely dry and arid. Memoranda on Tours and Touraine Including remarks on the climate with a sketch of the Botany And Geology of the Province also on the Wines and Mineral Waters of France The siliceous skeletons of marine organisms are formed of amorphous silica. The Geological Story of the Isle of Wight The external shape of stems or branches of trees, is best preserved in some fragments impregnated with slate-clay, and occasionally with siliceous matter, which occur imbedded in the coal. Narrative of a Second Expedition to the Shores of the Polar Sea When the coating of white siliceous clay was replaced by an opaque tin-enamel as in Spain, Italy, France, Holland, &c., a necessary change in the colour schemes resulted. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Crystals of sulphate of copper are placed at the bottom of the outer cell, into which water is poured; and the inner cell, into which the zinc plate goes, is filled with siliceous sand. The Eruption of Vesuvius in 1872 Any substance that is petrified or mineralized by siliceous earth. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology These thickenings are known as the nodules, and they are generally connected by a long median line, the raphe, which is a cleft in the siliceous valve, extending at least some part of its length. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" Mr. Darwin collected some masses of tufa which were found to be mainly organic, containing, besides remains of fresh-water infusoria, the siliceous tissue of plants! Island Life Or the Phenomena and Causes of Insular Faunas and Floras Vases, tiles, &c., shaped in good plastic clay, were covered with a white, highly siliceous coating fit to receive glazes of this type, and giving the best possible ground for the painted colours then known. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" They are mostly siliceous, but sometimes calcareous, and may differ very little in general appearance from the bulk of the sandstone. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" A siliceous mineral, nearly allied to chalcedony and flint, but less homogeneous and simple in texture. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology The cell-contents within the enclosure of the siliceous case separate into two distinct masses. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" Amongst such eruptions of hot-water and steam we might expect the formation of siliceous sinter, and the deposition of sulphur and other minerals; nor will our expectations be disappointed. Volcanoes: Past and Present The minute particle of their protoplasm is contained within the siliceous case. The Contemporary Review, Volume 36, September 1879 In clays also siliceous and calcareous concretions are often found. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" Any stone which is composed of an agglutination of grains of sand, whether calcareous, siliceous, or of any other mineral nature. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology A new siliceous valve is secreted by each of the two masses on the side opposite to the original valve, the new valves being situated within the girdle of the original frustule. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" It is also on the hearth that the flux combines with the siliceous and other impurities of the ore. Scientific American magazine Vol 2. No. 3 Oct 10 1846 The Advocate of Industry and Journal of Scientific, Mechanical and Other Improvements The wall is formed of parallel bands of glassy siliceous fibres, crossed by others at right angles, so as to form a square meshed net. The Beauties of Nature and the Wonders of the World We Live In It will be seen from the details given above that concretions may be calcareous, siliceous, argillaceous and phosphatic, and they may consist of carbonate or sulphide of iron. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" A siliceous rock is one mainly composed of silex. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology This peculiarity of structure affords ample scope for the growth of the protoplasmic cell-contents, for as the latter increase in volume the siliceous valves are pushed out, and their corresponding siliceous rims become broader. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" We find it composed of a siliceous bed, so intensely compact and hard, that it has preserved its proportions entire, while every other rock has worn from around it. The Cruise of the Betsey or, A Summer Ramble Among the Fossiliferous Deposits of the Hebrides. With Rambles of a Geologist or, Ten Thousand Miles Over the Fossiliferous Deposits of Scotland As is well known opal is a solidified jelly of siliceous composition, containing also combined water. A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public This is beautifully shown by many siliceous and calcareous nodules out of recent clays. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" Rounded water-worn fragments of rock or pebbles, cemented together by another mineral substance, which may be of a siliceous, calcareous, or argillaceous nature. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology The valves of some of the marine genera exhibit a beautiful areolated structure due to the presence of larger chambers within the siliceous cell-wall. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" The shells, some of them exceedingly minute, and not of edible species, occur in layers in a siliceous stratified sand, overlaid by a bed of bluish-colored silt. The Cruise of the Betsey or, A Summer Ramble Among the Fossiliferous Deposits of the Hebrides. With Rambles of a Geologist or, Ten Thousand Miles Over the Fossiliferous Deposits of Scotland These sands, in a state of greater or less division, and agglutinated by siliceous or calcareous cements, form the rocks called sandstones. The American Quarterly Review, No. 17, March 1831 After the paint had dried, the slip, or the siliceous glaze, was laid over the vase, except the under part of the foot and the inside. Museum of Antiquity A Description of Ancient Life Soil of the same description abounds everywhere on the surface of the decomposing limestone in Greece, that rock containing in it much siliceous and ferruginous matter. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology When the plant has fulfilled its natural course the siliceous covering sinks to the bottom of the water in which it had lived, and there forms part of the sediment. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" Tripoli and rottenstone are light, porous, siliceous rocks which have resulted from the leaching of calcareous materials from various siliceous limestones or calcareous cherts in the process of weathering. The Economic Aspect of Geology Note.—In selecting candles for use in the laboratory avoid those with metal fittings, since during sterilisation cracks develop at the junction of the metal and the siliceous material owing to the unequal expansion. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. The whole was then covered with a very fine siliceous glaze, probably formed of soda and well-levigated sand. Museum of Antiquity A Description of Ancient Life In Italy this term has been applied to a siliceous sandstone sometimes containing calcareous grains, mica, &c. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology It includes chalky limestones, siliceous earths, red clay, and, at the top, a layer of mudstone composed mainly of volcanic dust. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 3 "Banks" to "Bassoon" In others of the Brazilian ores, the manganese was deposited in sedimentary layers interbedded with siliceous "iron formations," and the whole series has subsequently been altered and recrystallized. The Economic Aspect of Geology The outer cuticle of Oriental species is so hard that it forms a sharp and durable cutting edge, and it is so siliceous that it can be used as a whetstone. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" Sand, absorptive power of, 68; an adulterant of guano, 319; calcareous, absorptive power of, 98; siliceous, absorptive power of, 98. Manures and the principles of manuring A siliceous mineral substance, sometimes approaching nearly to flint, or common quartz. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology The limestones contain Globigerina and other Foraminifera, the siliceous beds are made of Radiolaria, sponge spicules and diatoms, while the red clay closely resembles the red clay of the deepest parts of the oceans. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 3 "Banks" to "Bassoon" For this purpose siliceous rocks, chiefly quartzites and sandstones, are ground up, mixed with lime as a binder, and fused and pressed into bricks and shapes. The Economic Aspect of Geology This substance, which has been found to be a purely siliceous concretion, is possessed of peculiar optical properties. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" The cap for the pivots of the compass-cards, formed of hard siliceous stone, a chalcedony or carnelian, &c. The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. Wood petrified by siliceous earth, and acquiring a structure similar to the simple mineral called opal. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Shell and coral sands consist chiefly of fragments of shells and coral disintegrated by the action of the waves, and mixed with more or less siliceous sand, and containing small quantities of phosphate of lime. Elements of Agricultural Chemistry Because of their common gangue of quartz these are often called "dry" or "siliceous" ores. The Economic Aspect of Geology Lord Curryfin said petrifactions were often siliceous, but never pure silex; which this purported to be. Gryll Grange The coast, as well as the embouchures of the rivers, exhibit a deposit of deep mud, and yet far at sea banks of clean siliceous sand arise. The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. The Great Geyser rises out of a spacious basin at the summit of a circular mound composed of siliceous incrustations deposited from the spray of its waters. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Carbonate of lime, sand, or siliceous matter, and water, of course, are altogether worthless. Elements of Agricultural Chemistry In the United States about a third of the production comes from dry or siliceous ores, over a third from lead and zinc ores, and a fourth to a third from copper ores. The Economic Aspect of Geology If, therefore, the gluten of the sandstone be either calcareous or siliceous, it will naturally produce the effect above alluded to, though it is certainly singular that the stone should be soft when first quarried. On the Old Road, Vol. 2 (of 2) A Collection of Miscellaneous Essays and Articles on Art and Literature These reeds, as those used at the present day, were formed of the outer siliceous layer of a tall grass, Arundo donax, or sativa, which grows in Egypt and the south of Europe. The Recent Revolution in Organ Building Being an Account of Modern Developments Thus we find occasionally that shingle and sand have been agglutinated firmly together by a ferruginous or siliceous cement, or that lime in solution has been introduced, so as to bind together materials previously incoherent. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology The surface soil is clay in which are embedded fragments of siliceous sandstone, used for millstones and constructional purposes; the subsoil is limestone. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The general geologic features of the silver-bearing copper and lead ores, and of the dry or siliceous gold and silver ores, have been described on previous pages. The Economic Aspect of Geology Material.—The clay is generally gray or dark-reddish gray in the mass, and is apparently quite siliceous or sandy, numerous grains of quartz being visible. Illustrated Catalogue of a Portion of the Collections Made During the Field Season of 1881 Third Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1881-82, Government Printing Office, Washington, 1884, pages 427-510 On the wall, placed there in adding to its height, were a broken taro pestle and a very dense siliceous rock, of high specific gravity, and filled with olivines. Archeological Investigations Bureau of American Ethnology, Bulletin 76 They are, he says, in great part, of organic and freshwater origin, consisting of the siliceous cases of microscopic infusoria. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology We were now walking on granite mixed with siliceous sandstone; the soil shivered under our feet like the sides of boilers in which over-heated steam is forcibly confined. A Journey to the Centre of the Earth Certain developments in progress, notably the project for concentration of siliceous eastern Mesabi Range ores, make it likely that future domestic production will more nearly be able to meet the requirements. The Economic Aspect of Geology The figure represents one made 378 from potters’ clay, the other is of siliceous material. Illustrated Catalogue Of The Collections Obtained From The Indians Of New Mexico And Arizona In 1879 Second Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1880-81, Government Printing Office, Washington, 1883, pages 307-428 The line of demarkation between the limestone matrix, where this still exists in part, and the siliceous filling is as distinct as that between the stone and brick in a building. Archeological Investigations Bureau of American Ethnology, Bulletin 76 It contains so much siliceous matter in its pores that it quickly dulls chisels and saws used in working it. Growing Nuts in the North A Personal Story of the Author's Experience of 33 Years with Nut Culture in Minnesota and Wisconsin This final stage is macroscopically nothing more than a siliceous slate or schist, and is barely distinguishable from the end products of similar metamorphism in the more feldspathic schists and the Loudoun sandy slates. History and Comprehensive Description of Loudoun County, Virginia The word gem is used as a common name for all precious stones or jewels; they consist of the siliceous earths; and are much valued for their lustre, transparency, color, hardness, and rarity. A Catechism of Familiar Things; Their History, and the Events Which Led to Their Discovery. With a Short Explanation of Some of the Principal Natural Phenomena. For the Use of Schools and Families. Enlarged and Revised Edition. The viscous movements of siliceous materials, and the out-pouring of igneous rocks which often attend mountain elevation, would find an explanation in such temperatures. The Birth-Time of the World and Other Scientific Essays These siliceous bodies belong partly to the lowly vegetable organisms which are called Diatomace�, and partly to the minute and extremely simple animals, termed Radiolaria. Young Folks' Library, Volume XI (of 20) Wonders of Earth, Sea and Sky There are other means of chemical accretion, such as the depositions of dissolved calcareous or siliceous particles, as are seen in the formation of the stalactites of limestone in Derbyshire, or of calcedone in Cornwall. Zoonomia, Vol. I Or, the Laws of Organic Life It is so named on account of its prominent outcrops in South Mountain, near Weverton, Maryland, and consists entirely of siliceous fragments, mainly quartz and feldspar. History and Comprehensive Description of Loudoun County, Virginia As in borax, but leaves an insoluble siliceous skeleton. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations I suppose the siliceous epidermis must then have become too hard, and the pores in the stem too much closed up to admit of the further depredation of the fungi. Rambles and Recollections of an Indian Official Flints may be replaced by any siliceous stone, as agate, rock-crystal, or quartz. The Art of Travel Shifts and Contrivances Available in Wild Countries Three sorts of limestone were employed: for the best tombs, the fine white limestone of T�rah, or the compact siliceous limestone of Sakkarah; for ordinary tombs, the marly limestone of the Libyan hills. Manual of Egyptian Archaeology and Guide to the Study of Antiquities in Egypt The general composition of the two is the same—i. e., beds of feldspathic, siliceous material derived from crystalline rocks. History and Comprehensive Description of Loudoun County, Virginia Minute fresh-water plants, of a green colour, without a siliceous epidermis. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science The earlier glazes are applied directly to the clay; later a white or coloured slip is applied first, and a clear siliceous glaze over this. How to Observe in Archaeology A partly siliceous stone, such as granite, will answer in default of one that is wholly siliceous. The Art of Travel Shifts and Contrivances Available in Wild Countries They are composed of a tiny drop of plasm, resembling glue, covered by a thin shell of siliceous or sandy material. A Series of Lessons in Gnani Yoga 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 An order of minute plants which are provided with siliceous envelopes. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science I appeal to the analogy which, in this treatise, he has formed, between the stalactical concretions upon the surface of the earth, and the mineral concretions of siliceous substance. Theory of the Earth, Volume 1 (of 4) In nearly all varieties there will be found a siliceous residue insoluble in acids. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Dynamite, a powerful explosive substance, intensely local in its action; formed by impregnating a porous siliceous earth or other substance with some 70 per cent. of nitro-glycerine. The Nuttall Encyclopædia Being a Concise and Comprehensive Dictionary of General Knowledge At the base of those hills I found, as elsewhere, pebbles consisting chiefly of a splintery quartz rock, in which the grains of sand or quartz were firmly embedded in a siliceous cement. Three Expeditions into the Interior of Eastern Australia, Volume 1 We shall, however, afterwards see that some siliceous rocks are of organic origin. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science These are pieces of fossil wood, penetrated with a siliceous substance, which are brought from England, Germany, and Lochneagh in Ireland. Theory of the Earth, Volume 1 (of 4) Specimens are easily obtainable which are nearly pure and leave on treatment with acid only a slight siliceous residue. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The rice kernel is inclosed within two coverings, a course outer husk, which is easily removed, and an inner, reddish, siliceous coating. Science in the Kitchen. This projection, which we called Eagle Point, is of a siliceous sandstone formation, intersected by nearly vertical veins of quartz, and forms a spur thrown off from a high range four miles to the south-eastward. Discoveries in Australia, Volume 1. With an Account of the Coasts and Rivers Explored and Surveyed During The Voyage of H.M.S. Beagle, in the Years 1837-38-39-40-41-42-43. By Command of the Lords Commissioners of the Admiralty. Also a Narrative Of Captain Owen Stanley's Visits to the Islands in the Arafura Sea. Diatoms, which likewise secrete a siliceous skeleton, often of great beauty. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science I have one specimen, in which the primary crystals are siliceous, the secondary thin foliaceous crystals of deep red but transparent iron-ore, forming elegant figures, that have the form of roses. Theory of the Earth, Volume 1 (of 4) The geological character of the island is a red-coloured, coarse-granular, siliceous sandstone, disposed in horizontal strata, and intersected by veins of crystallised quartz. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 When well ground, it can be digested, with the exception of the siliceous coating. Science in the Kitchen. For the siliceous ingredient of his composition he made choice of chalk-flints, calcined and ground to powder. The Mirror of Literature, Amusement, and Instruction Volume 19, No. 550, June 2, 1832 In addition to deposits formed of flint itself, there are other siliceous deposits formed by certain silicates, and also of organic origin. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science The tertiary crystallization is a frosting of small siliceous crystals upon the edges of the foliaceous crystals. Theory of the Earth, Volume 1 (of 4) The summit of the head is flat and tabular, and the rocks in the vicinity are described by Captain King as consisting of siliceous sandstone. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 I noticed that each time the horse put its foot on the fine siliceous sand, a gentle chirping noise was produced. The Voyage of the Beagle The name alludes to the peculiar mixture of calcareous and siliceous characteristics in many of the beds. The Gutenberg Webster's Unabridged Dictionary Section C We find also in the same siliceous material the singular spherical bodies, with radiating spines, which occur so abundantly in the chalk flints, and which are termed Xanthidia. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science We have strata consolidated with siliceous matter, in a state different from that under which it has been observed, on certain occasions, to be deposited by water. Theory of the Earth, Volume 1 (of 4) Reddish, coarsely granular, siliceous sandstone; in horizontal strata, intersected by veins of crystallized quartz.* Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 The sand is entirely, or in greater part, siliceous; but some points are of a black colour, and from their glossy surface possess a metallic lustre. The Voyage of the Beagle The cellular tissue of the vegetable matter is filled, or even replaced, by various siliceous minerals like chalcedony, jasper, crystalline quartz and semi-opal, the silica having probably been introduced by thermal waters. The Project Gutenberg Encyclopedia Volume 1 of 28 The group consists, in Britain, of sands and clays, sometimes with bands of calcareous grit or siliceous limestone, and occasionally containing concretions of phosphate of lime, which are largely worked for agricultural purposes. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science M. de Dolomieu sees no corrosion of quartz, or solution of that substance, upon the surface of the earth; from this, then, he concludes, that siliceous substance is not dissolved in that situation of things. Theory of the Earth, Volume 1 (of 4) Coarse siliceous sand, concreted by ferruginous matter; which, in some places, is in the state of brown hematite. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 A fine siliceous material discolored by iron oxide, acts as a cement between the grains. The Long Labrador Trail Angles of sand destroyed by attrition and solution in steam; siliceous breccia cemented by solution in red-hot water. The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation The upper part of the mountains consists entirely of siliceous rock. Travels in Syria and the Holy Land I have septaria of this kind, in which, besides pyrites, iron-ore, calcareous spar, and another that is ferruginous and compound, there is contained siliceous crystals; a case which is not so common. Theory of the Earth, Volume 1 (of 4) But 'siliceous dust' will not wholly account for the veiling of the sun and the opaqueness of the higher atmosphere. To the Gold Coast for Gold A Personal Narrative in Two Volumes.—Volume I The shells of some are calcareous, of others siliceous. Vestiges of the Natural History of Creation The colours of these siliceous vegetables are generally brown, from the iron, I suppose, or manganese, which induced them to crystallize or to fuse more easily. The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation Only place your marble at the proper level, and twice a day you have the grand salubrious sparkling influx of ocean's self, self-filtered, and by its own operation permeated with a fine siliceous element. Erema — My Father's Sin Many of these are filled with a siliceous crystallization, which evidently proceeds from the circumference towards the centre. Theory of the Earth, Volume 1 (of 4) I am not much inclined to believe in such effects of the shock of water against blocks of granite, and in the erosion of siliceous matter. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 Ehrenberg suggests that it is composed of the siliceous coverings of a portion of the microscopic creatures, whose shells he has in other instances detected in their original condition. Vestiges of the Natural History of Creation These siliceous nodules resemble the nodules of iron-stone mentioned in note on Canto II. l. The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation White siliceous sand with layers of chalky marl, and included fragments of Chalk, for the most part unstratified, 9 feet. The Antiquity of Man But what I would here more particularly represent is, the transverse section of those longitudinal siliceous bodies These are seen in fig. Theory of the Earth, Volume 1 (of 4) Yet, according to M. Cordier, the fine pebbles of Suez owe their origin to a breccia formation, or siliceous agglomerate. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 The veinstone is pure quartz containing water in microscopical cavities, as in the quartz crystals of granite, but not combined as in the hydrous siliceous sinter deposited from hot springs. The Naturalist in Nicaragua Water with great degrees of heat dissolves siliceous matter. The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation The little mound, from the top of which the jet appears to rise, is composed of a substance named siliceous sinter, and is a deposit from the water of the fountain. Wonders of Creation In others, again, the primary crystals are siliceous, and the secondary calcareous. Theory of the Earth, Volume 1 (of 4) The changes at or near Cape Florida, from the Atlantic coast and its siliceous sand, to the Florida coast and its coral sand, must be curious. Louis Agassiz: His Life and Correspondence The ridge itself was chiefly of slate-rock, intermixed with masses of coarse siliceous granite. Journals of Two Expeditions into the Interior of New South Wales On cooling it deposited a siliceous matter or chalcedony forming a bason round its base. The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation The ranges on either side of the glen were generally varieties of gneiss and granite, in many of which feldspar predominated, coarse ferruginous sandstone, and a siliceous rock with mammillary hematite and hornblende. Expedition into Central Australia Of this kind, I have one which has, upon the calcareous crystals, beautiful transparent siliceous crystals, and iron sphericles both upon all these crystals, and within them. Theory of the Earth, Volume 1 (of 4) By the help of nature, its help-meet, it transformed a great deposit of siliceous limestone into beautiful onyx and painted it in all the colors and after the pattern of the rainbow. Tales of Aztlan; the Romance of a Hero of our Late Spanish-American War, Incidents of Interest from the Life of a western Pioneer and Other Tales The strongest and most lasting cement is siliceous, and sand rocks whose grains are closely cemented by silica, the chemical substance of which quartz is made, are known as quartzites. The Elements of Geology If it met with the fluor acid it became fluor; if with the siliceous acid, flint; and when mixed with clay and sand, or either of them, acquires the name of marl. The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation Below this, and in place of the shales, are talc-schists, jasper, and hornstone; and at the bottom, instead of the siliceous and argillaceous sandstones, are quartzite and gneiss. The Student's Elements of Geology Therefore, to prove the present point, we have but to exhibit specimens of siliceous and calcareous strata which have been evidently consolidated in this manner. Theory of the Earth, Volume 1 (of 4) We walked upon granite mingled with siliceous tufa. A Journey to the Interior of the Earth SYENITE, composed of feldspar and mica, has consolidated from a less siliceous mixture than has granite. The Elements of Geology Other siliceous sands have had their angles rounded off, like the pebbles in gravel-beds. The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation They appear to have been cracks, into which siliceous matter was infiltered. The Student's Elements of Geology For, instead of a siliceous ground, maculated with the rhombic feld-spar, which is the common state of porphyry, the ground is uniformly crystallised, or a homogeneous regular feld-spar, maculated with the transparent siliceous substance. Theory of the Earth, Volume 1 (of 4) Amongst them I here first noticed a variety often to be referred to, namely, a peculiar gallstone-yellow siliceous porphyry, frequently, but not invariably, containing grains of quartz. Geological Observations on South America DIORITE, still less siliceous, is composed of hornblende and feldspar,—the latter mineral being of different variety from the feldspar of granite and syenite. The Elements of Geology It is probable most siliceous sands or pebbles have at some ages of the world been long exposed to aqueous steams raised by subterranean fires. The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation In some places the siliceous matter of the schist becomes a granular quartz; and when hornblende and mica are added, the altered rock loses its stratification, and passes into a kind of granite. The Student's Elements of Geology This siliceous substance, viewed in one direction, or longitudinally, may be considered as columnar, prismatical, or continued in lines running nearly parallel. Theory of the Earth, Volume 1 (of 4) The gypseous formation, as here seen, has a coarser, more mechanical texture, and contains much more siliceous matter than the corresponding beds lower down the valley. Geological Observations on South America Small fragments of the jasper, examined under the microscope, seem to resemble the chalcedony with its colouring matter not separated into layers, but mingled in the siliceous paste, together with some impurities. Volcanic Islands By its union with the calcareous earth of the morass other strata of siliceous sand have been produced; and by the mixture of this with clay and lime arose the beds of marl. The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation In like manner gneiss and mica-schist may be nothing more than altered micaceous and argillaceous sandstones, granular quartz may have been derived from siliceous sandstone, and compact quartz from the same materials. The Student's Elements of Geology The Spanish marble already described, as well as many consolidated strata of siliceous gravel, of which I have specimens, afford the clearest evidence of this fact. Theory of the Earth, Volume 1 (of 4) Some of the layers of the black siliceous slate contained irregular angular fragments of imperfect pitchstone, which I believe, as in the Uspallata range, has originated in a metamorphic process. Geological Observations on South America The curiously formed veins have, I believe, been formed by siliceous matter being subsequently segregated. Volcanic Islands This curious fossil shews the transmutation of calcareous earth into siliceous, as much as the siliceous shells which abound in the cabinets of the curious. The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation The arenaceous laminae are much hardened at the point of contact, and the clays are converted into siliceous schist. The Student's Elements of Geology Feld-spar is a compound of siliceous, argillaceous, and calcareous earth, intimately united together. Theory of the Earth, Volume 1 (of 4) Highly siliceous, fine-grained white sandstone. 8th and 9th. Geological Observations on South America The sandstones of the great platforms of Eastern Australia, which also rest on granite, differ in containing more earthy and less siliceous matter. Volcanic Islands These were placed close to the fire, and the heat was sufficient to melt a portion of one of them, which, mixing with the siliceous sand at its base, produced a stream of glass. History of Phoenicia Some of the siliceous rocks of this formation are used extensively for mill- stones. The Student's Elements of Geology It may be, therefore, asserted, that no siliceous body having the hardness of flint, nor any crystallization of that substance, has ever been formed, except by fusion. Theory of the Earth, Volume 1 (of 4) In some of the jaspery layers, and in some of the black siliceous slaty bands, there were irregular seams of imperfect pitchstone, undoubtedly of metamorphic origin, and other seams of brown, crystalline limestone. Geological Observations on South America In some places I observed a breccia of quartz, with the fragments almost dissolved in a siliceous paste. Volcanic Islands Few objects are more beautiful than the minute siliceous cases of the diatomaceae: were these created that they might be examined and admired under the higher powers of the microscope? The Origin of Species by means of Natural Selection, 6th Edition Immediately upon the chalk at the bottom of all the tertiary strata in France there generally is a conglomerate or breccia of rolled and angular chalk-flints, cemented by siliceous sand. The Student's Elements of Geology In other specimens, there is first a lining of colourless siliceous crystals, then another lining of amethystine crystals, and sometimes within that, fuliginous crystals. Theory of the Earth, Volume 1 (of 4) Above this conglomerate, there is a black siliceous claystone, and above it numerous alternations of dark-purplish and green porphyries, which may be considered as the uppermost limit of the porphyritic conglomerate formation. Geological Observations on South America Silica is the mineral with which the waters of this fountain are impregnated, and the substance which they deposit, as they slowly evaporate, is named siliceous sinter. The San Francisco calamity by earthquake and fire To strike out love from that siliceous nature a man of iron was needed. The Marriage Contract These may be said to belong principally to three divisions, the siliceous, the argillaceous, and the calcareous, which are formed respectively of flint, clay, and carbonate of lime. The Student's Elements of Geology Hitherto, however, the nature of the siliceous substance is not sufficiently known, to enable us to found, upon chemical principles, the mineral operations of nature. Theory of the Earth, Volume 1 (of 4) Those substances are chiefly the siliceous and aluminous earths. Theory of the Earth, Volume 1 (of 4) Now, let those who would deny the fusion of this siliceous body explain how water could dissolve these three different bodies, and deposit them in their present shape. Theory of the Earth, Volume 1 (of 4) The fact is, that I have seen in sandstone the empty mould of marine shells with some siliceous crystallization, so far as I remember, which corresponded perfectly with that idea. Theory of the Earth, Volume 1 (of 4) The above-mentioned three classes of rocks, the siliceous, argillaceous, and calcareous, pass continually into each other, and rarely occur in a perfectly separate and pure form. The Student's Elements of Geology The cavity within the coated part of the pebble is filled up without vacuity, first, with colourless siliceous crystals; secondly, with fuliginous crystals; and, lastly, with white or colourless calcareous spar. Theory of the Earth, Volume 1 (of 4) What should we now conclude from this?—That calcareous and siliceous substances were mutually convertible. Theory of the Earth, Volume 1 (of 4) This water, therefore, not only contains siliceous substance in a dissolved state, but deposits this again, either by means of cooling, or being aerated, or of evaporating. Theory of the Earth, Volume 1 (of 4) Dr Black has been analysing the water; and he finds in it siliceous matter dissolved by an alkaline substance, in the manner of liquor silicum44. Theory of the Earth, Volume 1 (of 4) The siliceous sandstone called "upper quader" by the Germans overlies white argillaceous chalk or "planer-kalk," a deposit resembling in composition and organic remains the chalk marl of the English series. The Student's Elements of Geology It must not be here objected, That there are frequently found siliceous crystals and amethysts containing water; and that it is impossible to confine water even in melted glass. Theory of the Earth, Volume 1 (of 4) It supposes a calcareous body to be metamorphosed, somehow by means of the mountain acid, into a siliceous body. Theory of the Earth, Volume 1 (of 4) He sees plainly that the common notion of infiltration will not at all explain the evident confusion of those calcareous and siliceous bodies which appear to him to be metamorphosing into each other. Theory of the Earth, Volume 1 (of 4) The supposed case is this; a calcareous body is to be metamorphosed into a siliceous nodule, having a cavity within it lined with quartz, crystals, etc. Theory of the Earth, Volume 1 (of 4) This compact siliceous limestone extends over a wide area. The Student's Elements of Geology Such is the lapis amygdaloides, and many of our whin-stone rocks, which contain pebbles crystallized and variously figured, both calcareous, siliceous, and of a mixture in which both these substances form distinct parts. Theory of the Earth, Volume 1 (of 4) All the specimens which I have seen consist of incrustation, some purely siliceous, some calcareous, and others mixed of those two, more or less. Theory of the Earth, Volume 1 (of 4) But the siliceous crystallizations within close cavities is a curious subject, which we shall have occasion to examine more particularly in treating of agates. Theory of the Earth, Volume 1 (of 4) There is nothing particular in the siliceous mixture in this species of lime-stone, except the vein of that substance. Theory of the Earth, Volume 1 (of 4) As more than half of their bulk is formed of siliceous earth, they may afford an endless supply of silica to all the great rivers which flow into the ocean. The Student's Elements of Geology There are to be found, among the various strata of the globe, bodies formed of two different kinds of substances, siliceous bodies, and those which may be termed sulphureous or phlogistic. Theory of the Earth, Volume 1 (of 4) Consequently, without knowing the principle upon which it proceeds, we here perceive a natural operation by which siliceous petrifaction may be performed. Theory of the Earth, Volume 1 (of 4) Lastly, We have another principle for the dissolution of siliceous substance. Theory of the Earth, Volume 1 (of 4) This is the fluor acid which volatilises the siliceous substance. Theory of the Earth, Volume 1 (of 4) The siliceous grains in sand are usually rounded, as if by the action of running water. The Student's Elements of Geology This compound siliceous body being, for ages, exposed to the weather, the calcareous part of it is dissolved, and the siliceous part is left in form of a soft white earth. Theory of the Earth, Volume 1 (of 4) To speak first of the sandy division: beds of loose sand are frequently met with, of which the grains consist entirely of silex, which term comprehends all purely siliceous minerals, as quartz and common flint. The Student's Elements of Geology In attempting to explain the process of petrifaction in such cases, we may first assume that strata are very generally permeated by water charged with minute portions of calcareous, siliceous, and other earths in solution. The Student's Elements of Geology Pure siliceous rocks may be known by not effervescing when a drop of nitric, sulphuric or other acid is applied to them, or by the grains not being readily scratched or broken by ordinary pressure. The Student's Elements of Geology The calcareous matter hence derived has evidently served, at some former period, as a cement to the siliceous grains of sand, and thus a solid sandstone has been produced. The Student's Elements of Geology This, however, is certain, that we must consider siliceous substances as insoluble in water. Theory of the Earth, Volume 1 (of 4) |
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