CaWO
Scheelite is extremely rare at MSH. In fact, only one specimen has been identified and there is no record of the owner of the specimen.
PHYSICAL CHARACTERISTICS:
Color is usually colorless.
Luster is vitreous to adamantine.
Diaphaneity is transparent to translucent.
Crystal System is tetragonal;
Crystal Habits include irregular grains to 2mm.
Cleavage {101} is distinct and {001} is indistinct.
Fracture is subconchoidal to uneven.
Hardness is 4.5 – 5.
Specific Gravity is approximately 6.1 g/cm
Streak is white.
Associated Minerals are unknown.
Distinguishing Features: Luster and fluorescence.
Origin: Named in 1821 after Karl Wilhelm Scheele (1742-1786),
Swedish chemist and apothecary, who proved the existence of
tungstic oxide in the mineral in 1781.
CLASSIFICATION:
Dana System
# 48.1.2.1
Strunz Classification
# VI/G.01-20
REFERENCES:
MinRec 21:334 (1990), Dana 8:996-998 (1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH
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