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scheelite
scheelite Mineral, CaWO4; sp. gr. 5.9–6.1; hardness 4.5–5.0; tetragonal; white, or sometimes shades of yellow, green, brown, or red; white streak; vitreous lustre; crystals usually bipyramidal, also occurs massive or granular; cleavage good {111}; fluorescent; occurs in pegmatite veins and high-temperature mineral veins, often in association with wolframite, cassiterite, molybdenite, fluorite, and topaz, also in contact metamorphic zones together with axinite, garnet, wollastonite, and metamorphic calcium minerals. It is one of the chief ores of tungsten, and named after the 18th-century Swedish chemist K. W. Scheele.
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AILSA ALLABY and MICHAEL ALLABY. "scheelite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. AILSA ALLABY and MICHAEL ALLABY. "scheelite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O13-scheelite.html AILSA ALLABY and MICHAEL ALLABY. "scheelite." A Dictionary of Earth Sciences. 1999. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-scheelite.html |
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scheelite
scheelite , heavy white or yellow mineral, calcium tungstate, CaWO 4 , crystallizing in the tetragonal system. It is found in granite pegmatites, in contact-metamorphic deposits (especially limestones intruded by granites), and in quartz veins. It is an important ore of tungsten and is mined in many parts of the world. Scheelite fluoresces bright bluish-white in ultraviolet radiation, a distinguishing feature utilized in prospecting and mining. |
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Cite this article
"scheelite." The Columbia Encyclopedia, 6th ed.. 2008. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "scheelite." The Columbia Encyclopedia, 6th ed.. 2008. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1E1-scheelit.html "scheelite." The Columbia Encyclopedia, 6th ed.. 2008. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-scheelit.html |
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