|SCHEELITE MINERAL FACTS|
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Scheelite Mineral Facts:
Chemical Formula: CaWO4 80.6%
Colors: White, yellow, orange, green, brown. Streak is white.
Hardness: 4.5 to 5
Cleavage: Perfect parallel to the pyramid. Fracture uneven, brittle.
Crystallography: Tetragonal; tri-pyramidal
Luster:. Vitreous to adamantine; transparent to opaque.
(Refractive Index): e= 1.9345,
Identification and Diagnostics
Localities and Origins:
Production. Scheelite has been mined in quantity in Idaho, Alaska, California, Nevada, Arizona, and New Mexico, as a source of tungsten, but most of this element has heretofore been produced from other compounds, mainly wolframite. For some years it was produced in large quantity near Bishop, Inyo Co., California.
Scheelite is a subordinate ore of tungsten, with wolframite furnishing the greater amount on a worldwide basis. In the US, Scheelite has been the more important source of the metal. Tungsten is used principally in the manufacture of tool steel, various steel alloys and electric furnaces. It is also employed as the filaments in electric-light bulbs, in the manufacture of sodium tungstate which is used for fireproofing cloth, as a mordant in dyeing, and for a number of other minor purposes.
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Please note that the author, Chris Ralph, retains all copyrights to this entire document and it may not be reproduced, quoted or copied without permission.
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