Scheelite

Scheelite: Calcium tungstate (CaWO4), crystallizes in the Tetragonal System in tabular crystals, often granular to massive; colors range from colorless, white, gray, yellow, orange, to green. Density 5.90–6.1 g/cm³, Mohs hardness 4.5–5, refractive index 1.918–1.920 and 1.934–1.937.

scheelite
(Photo: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0/Wikimedia Commons, License CC-BY-SA-3.0)

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