Scheelite is a calcium tungstate mineral (CaWO4). It has a nonmetallic luster, is variably colored, moderately hard (H = 4.5 to 5), has one cleavage plane, is fairly heavy for its size, and fluoresces an intense blue under ultraviolet light. Scheelite occurs in igneous & metamorphic rocks, and is a ore mineral for tungsten (W).
Scheelite in matrix (field of view 3.4 cm across) from Timmins, Ontario, Canada.
Left: scheelite (light brown) under white light.
Right: scheelite under ultraviolet light; scheelite usually fluoresces a bright blue under UV.