| 单词 | apatite |
| 例句 | Bournonite; apatite on muscovite; natural zircon in a spray of colors; dozens more minerals he cannot name. All the Light We Cannot See 2014-05-06T00:00:00Z Indeed, the resistance of the material, made of the mineral apatite with some of the lead atoms replaced by copper, is about 100 times higher than pure copper and other good conducting metals. LK-99 Is the Superconductor of the Summer 2023-08-03T04:00:00Z A paper posted by researchers in South Korea a few days ago claims that modifying the mineral apatite produces a superconductor that works at ordinary temperatures and pressures. A Looming Retraction Casts a Shadow Over a Field of Physics 2023-07-26T04:00:00Z For example, a minor constituent of granitic rocks is the calcium-phosphate mineral apatite, which is a source of the important soil nutrient phosphorus. Physical Geology 2015-01-01T00:00:00Z Phosphorus is an essential element that occurs in the mineral apatite, which is found in trace amounts in common igneous rocks. An Introduction to Geology 2017-01-01T00:00:00Z What’s more, the structures were found to contain graphite as well as the minerals apatite and carbonate – which are associated with biological matter. Do the Quebec fossils prove that life begin much earlier than we thought? 2017-03-03T05:00:00Z In an interview, Dr. Griffin said her paper, titled “Origin of correlated isolated flat bands in copper-substituted lead phosphate apatite,” did not confirm the hype. LK-99 Is the Superconductor of the Summer 2023-08-03T04:00:00Z So they examined the buildup of radiogenic elements in the mineral apatite. Storing greenhouse gas underground—for a million years 2014-10-14T04:00:00Z For example apatite is about three times harder than fluorite and diamond is three times harder than corundum. Physical Geology 2015-01-01T00:00:00Z An example of biologic precipitation from the vertebrate world is bone, which is composed mostly of a type of apatite, a mineral in the phosphate group. An Introduction to Geology 2017-01-01T00:00:00Z We modeled existing data from the literature, finding that nominally anhydrous minerals do not sufficiently fractionate H from F and Cl to generate H-rich apatite. [Report] The Lunar Apatite Paradox 2014-04-29T14:56:35.931Z Rather, her computer simulations show that the substitution of copper in the apatite did result in an unusual rearrangement of the atoms. LK-99 Is the Superconductor of the Summer 2023-08-03T04:00:00Z Chlorine is also attractive to apatite, but not quite as much as fluorine. Doubt cast on evidence for wet Moon 2014-03-22T14:50:30Z A US team studied a mineral called apatite, which is found in a variety of lunar rock types. Doubt cast on evidence for wet Moon 2014-03-22T14:50:30Z Incomplete understanding of He diffusion in apatite poses considerable difficulties in assigning constrained cooling paths, requiring critical examination of modeling assumptions. [Technical Comment] Comment on “Apatite 4He/3He and (U-Th)/He Evidence for an Ancient Grand Canyon” 2013-04-18T15:55:25.217Z Recent discoveries of water-rich lunar apatite are more consistent with the hydrous magmas of Earth than the otherwise volatile-depleted rocks of the Moon. [Report] The Lunar Apatite Paradox 2014-04-29T14:56:35.931Z Mica, iron oxides, apatite, zircon, epidote and hornblende may also be present in small amount. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z "We used to think it was a simple proportionality - that the more hydrogen was in the apatite, the more hydrogen in the magma," Dr Boyce explained. Doubt cast on evidence for wet Moon 2014-03-22T14:50:30Z "We used to think it was a simple proportionality, that the more hydrogen was in the apatite, the more hydrogen in the magma," Dr Boyce explained. Doubt cast on evidence for wet Moon 2014-03-22T14:50:30Z 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 A high proportion of zircon inclusions are made up of phosphate minerals called apatite, Williams says. Earth's 'Time Capsules' May Be Flawed 2011-11-17T19:07:05Z Zircon, apatite and iron oxides are the first; their crystals are small, very perfect and nearly free from enclosures; they are followed by hornblende and biotite; if muscovite is present it succeeds the brown mica. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z Among the accessory minerals may be mentioned apatite, magnetite, ilmenite, picotite and garnet. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z The apatite crystals contain uranium and thorium, which over millions of years decay radioactively, producing helium-4. Novel Technique Reveals How Glaciers Sculpted Their Valleys 2011-04-04T16:38:00Z Biotite, if present, is brown; epidote is yellow or colourless; rutile, apatite and quartz all occur with some frequency. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6 "English Language" to "Epsom Salts" 2011-02-19T03:00:59.807Z Cox’s team analyzed the apatite in two ways—the amounts of uranium, thorium and helium it contained, and the number of “fission tracks” left by decaying uranium—to build a cooling history of the Gamburtsevs. ?Fossil? Mountains Entombed by Ice 2010-10-18T16:28:00Z Since then, several research groups have also looked at the mineral apatite, which can lock up water in its chemical structure, in lunar rocks. All Wet, or High and Dry? 2010-08-09T14:55:00Z The “asparagus-stone” is a form of apatite, simulating asparagus in colour. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" At the moment, the technique works only with crystals of apatite, a calcium phosphate mineral found mainly in plutonic rocks, such as granite, that solidify from magma deep underground. Novel Technique Reveals How Glaciers Sculpted Their Valleys 2011-04-04T16:38:00Z The very coarse-grained granites of Ontario contain apatite crystals of corresponding size, which have been picked out as a source of artificial phosphate manures. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli Grains of the mineral apatite preserve a record, known as a cooling age, of how fast the mountains were eroded. ?Fossil? Mountains Entombed by Ice 2010-10-18T16:28:00Z Another apatite researcher, Francis McCubbin of the University of New Mexico, points out that one person’s “bone-dry” could be another person’s “relatively damp.” All Wet, or High and Dry? 2010-08-09T14:55:00Z The accessory minerals of these rocks are principally oligoclase, muscovite, apatite and zircon. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Other minerals, except apatite, zircon and magnetite, are typically absent. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" Other localities are known; for instance, Brandy Gill in Caldbeck Fells, Cumberland, where with molybdenite and apatite it is embedded in white quartz. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 1 "Bisharin" to "Bohea" 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" “I think we’re dealing with a case of three blind men and an elephant,” says James Greenwood, a planetary scientist at Wesleyan University in Connecticut who has worked on apatite studies. All Wet, or High and Dry? 2010-08-09T14:55:00Z In this type of symmetry, of which apatite is the best example, there is only one plane of symmetry, which is perpendicular to the hexad axis. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" The interior contains two long prisms, probably of apatite. Volcanoes: Past and Present 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" The gangue is usually quartz, containing smaller amounts of a number of less common minerals—including lithium mica, fluorite, topaz, tourmaline, and apatite. The Economic Aspect of Geology This apatite has ceased to be imported of late years, owing to a duty on exportation. Manures and the principles of manuring In its general appearance, apatite exhibits wide variations. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" On the large scale, mechanical arrangements are employed for mixing the materials, so as to economise labour, and mineral phosphates, such as apatite, can then be used with advantage. Elements of Agricultural Chemistry Phosphorite and sombrerite are mineral forms of calcium phosphate, while apatite consists of calcium phosphate together with calcium fluoride or chloride. An Elementary Study of Chemistry Phosphate of lime, in the forms of apatite, phosphorite, coprolite, &c., is largely mined. A Text-book of Assaying: For the Use of Those Connected with Mines. We have already referred in Chapter V. to large deposits of apatite or phosphorite found in Canada. Manures and the principles of manuring With regard to its mode of occurrence, apatite is found under a variety of conditions. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" The dolomite of Ceylon is not pure, far from it, being mixed freely with apatite or phosphate of lime. The Commercial Products of the Vegetable Kingdom Considered in Their Various Uses to Man and in Their Relation to the Arts and Manufactures; Forming a Practical Treatise & Handbook of Reference for the Colonist, Manufacturer, Merchant, and Consumer, on the Cultivation, Preparation for Shipment, and Commercial Value, &c. of the Various Substances Obtained From Trees and Plants, Entering into the Husbandry of Tropical and Sub-tropical Regions, &c. The mineral apatite is composed of calcium phosphate, associated with calcium chloride, or fluoride. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes It always occurs compined, usually in phosphates, as in the mineral apatite, in bones, etc. The Gutenberg Webster's Unabridged Dictionary Section P and Q The difficulty of grinding the phosphate varies, of course, with the nature of the material used—apatite, for example, being much more difficult to reduce to the necessary fineness than phosphatic guano. Manures and the principles of manuring Another common mode of occurrence of apatite is in metamorphic crystalline rocks, especially in crystalline limestones: in eastern Canada extensive beds of apatite occur in the limestones associated with the Laurentian gneisses. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" How Minerals Got Their Names Names of most minerals end in "ite"—apatite, calcite, dolomite, fluorite. Let's Collect Rocks and Shells Since the calcium phosphate of the apatite is also insoluble in ammoniacal solutions, this procedure cannot be applied directly. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes It occurs in granite and other rocks, as the mineral apatite, in soils, in plants, particularly in seeds and grains, and in the bones, brains, etc., of vertebrates. An Introduction to Chemical Science It most abundantly occurs as apatite, a mineral consisting of calcium phosphate, with small quantities of calcium fluoride or calcium chloride. Manures and the principles of manuring The first consists of calcium phosphate along with calcium fluoride; and in other kinds of apatite the calcium fluoride is replaced by calcium chloride. Manures and the principles of manuring Phosphorite is another name for apatite, but is chiefly applied to impure amorphous apatite. Manures and the principles of manuring Of the substances likely to occur in apatite, silicic acid alone interferes with the precipitation of the phosphoric acid in nitric acid solution. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The main sources of phosphates and P are the phosphate beds of South Carolina, the apatite beds of Canada, and the bones of animals. An Introduction to Chemical Science This apatite, or phosphorite, is found in certain parts of the world in large masses; but as a rule, it only occurs in small quantities in most rocks. Manures and the principles of manuring The percentage of phosphate of lime in different kinds of apatite may be stated at from 70 to 90 per cent. Manures and the principles of manuring It occurs in very large quantities in Canada, the Canadian apatite being very rich in phosphate of lime—80 to 90 per cent. Manures and the principles of manuring A sample of apatite weighing 0.60 gram is analyzed for its phosphoric anhydride content. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes |
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