Scheelite/Calcium Tungstate-III
- Details
- Category: Tungsten Information
- Published on Thursday, 02 July 2015 15:31
Physical characteristics of scheelite/calcium tungstate:
Color is white, yellow, orange or greenish gray to brown.
Luster is adamantine to greasy.
Transparency: Crystals are transparent to translucent.
Crystal System is tetragonal; 4/m
Crystal Habits include the pseudo-octahedral crystals that are actually tetragonal dipyramids. Also massive and granular.
Cleavage is indistinct in two directions and good in another (dipyramidal).
Fracture is conchoidal.
Hardness is 4.5 - 5.
Specific Gravity is approximately 5.9 - 6.1 (very heavy for translucent minerals).
Streak is white.
Other Characteristics: Fluoresces blue (yellow with molybdenum traces) under short wave ultraviolet light.
Associated Minerals are quartz, garnets, vesuvianite, epidote, topaz, schorl, apatite, gold, silver, molybdenite, cassiterite, wolframite and fluorite.
Notable Occurrences include Hollinger Mine, Ontario, Canada; Saxony, Germany; Tong Wha, Korea; Brazil; Sonora, Mexico; Cornwall, England; New South Wales and Queensland, Australia and Mill City, Nevada, Atolia, San Bernardino Co., California, Cochise Co., Arizona, Utah and Colorado, USA.
Best Field Indicators are crystal habit, color, density, luster and especially its fluorescence.
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