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Dominant species
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Anhydrite
Chemical
Formula
CaSO4
Species
Sulfates
Crystal
System
Orthorhombic
Mohs
Scale
3
Specific
Gravity
2.97
Color
Colorless to pale blue or Purple if transparent; white, mauve, rose, pale brown or gray from included impurities
Streak
White
Luster
Vitreous, Greasy, Pearly
Refractive
Index
n = 1.567 - 1.574 n = 1.574 - 1.579 n = 1.609 - 1.618
Diaphaneity
Transparent, Translucent
Cleavage
PerfectOn perfect; on nearly perfect; on good to imperfect.
Fracture
Irregular/Uneven, Splintery
Crystal Habit:Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments. Also occurs as grainy, massive, or nodular masses
Geological Setting:Sedimentary evaporite deposits, cap rock of salt domes.
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