scheelite

noun Mineralogy.

1. calcium tungstate, CaWO4, usually occurring in tetragonal crystals: an important ore of tungsten.

noun

1. a white, brownish, or greenish mineral, usually fluorescent, consisting of calcium tungstate in tetragonal crystalline form with some tungsten often replaced by molybdenum: occurs principally in contact metamorphic rocks and quartz veins, and is an important source of tungsten and purified calcium tungstate. Formula: CaWO 4