Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.34-2.512.90-2.98
1
7.18
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Fracture
-
Conchoidal
Cleavage
None
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Mohs Hardness
-99993.5
2
10
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Chemical Composition
SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references