| 单词 | fluorspar |
| 例句 | One result is the fluorspar district of southern Illinois, which once produced a majority of the country’s fluorite—used to smelt steel and create hydrofluoric acid. Major U.S. geological survey aims to uncover minerals critical for batteries and microchips 2023-06-01T04:00:00Z Salt, fluorspar and galena crystallize in simple cubes. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z 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 These were probably quartz in this instance, although fluorspar is also included in this same genus. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z It is often associated with blende and pyrites, and with calcite, fluorspar, quartz, barytes, chalybite and pearlspar as gangue minerals; in the upper oxidized parts of the deposits, cerussite and anglesite occur as alteration products. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z The commodities at issue in the WTO case also included magnesium, manganese, silicon carbide, fluorspar, silicon carbide and yellow phosphorus, which are used by the steel, aluminum, automotive and chemicals industries. Chinese Curbs on Raw-Material Exports Break Rules, WTO Says 2011-07-05T15:26:44Z Examples of simple forms amongst crystallized substances are octahedra of alum and spinel and cubes of salt and fluorspar. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z The crystals occurred in association with topaz, fluorspar and cassiterite; but they were mostly of rather pale colour. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Of 41 minerals and metals it analyzed, the commission identified these 14 as short in supply: antimony, beryllium, cobalt, fluorspar, gallium, indium, germanium, graphite, magnesium, niobium, platinum group metals, rare earths, tantalum and tungsten. Europe Sounds Alarm on Minerals Shortage 2010-06-16T19:03:00Z Boron fluoride BF3 was first prepared in 1808 by Gay Lussac and L. Th�nard and is best obtained by heating a mixture of the trioxide and fluorspar with concentrated sulphuric acid. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" Blende occurs in metalliferous veins, often in association with galena, also with chalcopyrite, barytes, fluorspar, &c. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 1 "Bisharin" to "Bohea" Copper, coal, gold, molybdenum, fluorspar, uranium, tin, and tungsten account for a large part of industrial production and foreign direct investment. The 2008 CIA World Factbook The chief foreign producer of fluorspar is Great Britain, and much of this product comes to the United States. The Economic Aspect of Geology Afghanistan, antimony, beryllium, , , cobalt, Democratic Republic of Congo, fluorspar, gallium, germanium, graphite, indium, magnesium, metals, minerals, niobium, platinum group metals, rare earths, Russia, tantalum, tungsten U.N. Europe Sounds Alarm on Minerals Shortage 2010-06-16T19:03:00Z Those stones which show electricity on the application of pressure are such as the fluorspar, calcite, and topaz. The Chemistry, Properties and Tests of Precious Stones The aluminium in the form of a fine powder is mixed with the metallic oxide, together with some substance such as fluorspar to act as a flux. An Elementary Study of Chemistry Copper, coal, gold, molybdenum, fluorspar, uranium, tin, and tungsten account for a large part of industrial production and foreign direct investment. The 2008 CIA World Factbook The production of fluorspar in the United States is several times that of any other country. The Economic Aspect of Geology These chemists electrolyse either pure calcium chloride, or a mixture of this salt with fluorspar, in a graphite vessel which serves as the anode. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" See, the metallic core of this planet is covered, much less thickly than that of Terra, with fluoride rock—fluorspar, and that sort of thing. Uller Uprising Hydrofluoric acid is readily obtained from fluorspar by the action of concentrated sulphuric acid. An Elementary Study of Chemistry These beautiful ornaments of polished fluorspar—first made and brought into fashion, we believe, by the late Mr. Mawe, of the Strand—are even more appreciated by our Gallic neighbours than by ourselves. The Mirror of Literature, Amusement, and Instruction Volume 20, No. 577, July 7, 1827 The United States has sufficient supplies of fluorspar to meet all its own demands for this material. The Economic Aspect of Geology The fluoride of calcium, or fluorspar, may be used for this experiment. 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 These fluorspar stoppers, which are covered with a coating of gum lac during the electrolysis, carry the electrode rods, t, which are thus perfectly insulated. Scientific American Supplement, No. 832, December 12, 1891 A mixture of fluorspar and sulphuric acid is then painted over the vessel and after a few minutes the vessel is washed clean. An Elementary Study of Chemistry In addition there were shown splendid specimens of fluorspar, lead, and zinc. Final Report of the Louisiana Purchase Exposition Commission The domestic fluorspar is suitable for practically all purposes for which fluorspar is used except for lenses in optical instruments. The Economic Aspect of Geology We have to mix one part of the silicate with two parts of a mixture composed of one part of fluorspar and one and a half parts of bisulphate of potassa. 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 If it is required to heat the fluorspar tubes, they are surrounded by a closely wound copper spiral, which may be heated by a Bunsen flame. Scientific American Supplement, No. 832, December 12, 1891 What is the significance of the term fluorspar? An Elementary Study of Chemistry It is obtained from decomposition of fluorspar by strong sulphuric acid. American Hand Book of the Daguerreotype For this use very small quantities of material imported from Japan have been used, but recently fluorspar of a grade suitable for optical purposes has been found in Illinois, Kentucky, New Hampshire, and other states. The Economic Aspect of Geology Aluminum is formed by the electrolysis of the aluminum oxide in a fused bath of cryolite and fluorspar. The Story of Electricity When the liquid contains water, or when hydrofluoric acid is a product of the reaction, cylinders of platinum or of fluorspar are employed. Scientific American Supplement, No. 832, December 12, 1891 The chief use of fluorspar is as a flux in the manufacture of open-hearth steel. The Economic Aspect of Geology The apparatus is first filled with the gas to be experimented upon, then the fluorine is allowed to enter, and an observation of what occurs may be made through the fluorspar windows. Scientific American Supplement, No. 832, December 12, 1891 For fluxing purposes domestic fluorspar is superior to the foreign product. The Economic Aspect of Geology When the experiment is performed in the fluorspar tube, the gaseous fluoride may be collected over mercury. Scientific American Supplement, No. 832, December 12, 1891 It is composed of a tube of platinum, fifteen centimeters long, closed by two plates of clear, transparent, and colorless fluorspar, and carrying three lateral narrower tubes also of platinum. Scientific American Supplement, No. 832, December 12, 1891 Metallic calcium also burns in fluorine gas, forming the fused fluoride, and occasionally minute crystals of fluorspar. Scientific American Supplement, No. 832, December 12, 1891 The best mode of obtaining the fluoride of platinum for this purpose is to heat a bundle of platinum wires to low redness in the fluorspar reaction tube in a rapid stream of fluorine. Scientific American Supplement, No. 832, December 12, 1891 The large fluorspar deposits of Illinois and Kentucky contain fluorite with calcite, barite, and metallic sulphides, in wide veins filling fissures in limestones and sandstones and replacing the fissure walls. The Economic Aspect of Geology |
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