Scheelite (CaWO4), a heavy white mineral of non-metallic luster, occurs in many contact-metamorphic deposits. The scheelite is associated with garnet, calcite, hornblende and pyroxene. Other metallic minerals are rare. In the early 1900s, this type scheelite deposit was discovered in Mono, Inyo County, California. In the same time frame, several such deposits were discovered and worked in the Humboldt Range, Nevada, particularly near Mill City. The association here is calcite, scheelite, garnet, epidote and pyrite, and the deposit occurs in limestone close to granite and is intersected by a dike of aplite.  A number of sheelite based scarn deposits have been worked extensively in California, Nevada and Utah where they have been of considerable economic importance.

 

In spite of the number of deposits that have been found, it is possible that many such deposits have been overlooked. At Atolia in San Bernardino, California, schists cut by granite, scheelite is found in gold-bearing quartz veins. Locally, around Atolia the sands and residual surface materials have been worked as placers.

 

Tests. Tungsten salts color the microcosmic bead blue in the reducing flame. Tungsten minerals, fused with sodium carbonate and dissolved in hydrochloric acid, give, on the addition of a small piece of tin or zinc, a blue solution when heated.

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