Scheelite Composition, Structure and Associated Minerals

Composition, Structure and Associated Minerals:

Scheelite is found in granite pegmatites, contact metamorphic deposits, and high temperature veins. In these veins, it occurs usually with quartz in crystalline rocks associated with cassiterite, topaz, fluorite, apatite, molybdenite, wolframite, and many other metallic compounds. Found at times with gold. As a contact metamorphic product in altered limestone intruded by granite it is associated with typical scarn minerals like garnet and epidote. It is probably in all cases deposited from hot solutions. Sometimes found as crystals, but usually occurs reniform, with a columnar structure; also massive and granular.

Identification and Diagnostics

Scheelite is distinguished from limestone, which its massive forms closely resemble, by its higher specific gravity and the absence of effervescence with HCl. From quartz it is distinguished by its softness and from barite by greater hardness and higher specific gravity. Nearly all scheelite fluoresces under short wave ultra violet light. This can make for a fast method of finding scheelite specimens.



 

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