Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-2.982.82
1
7.18
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Fracture
Conchoidal
-
Cleavage
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Perfect in one direction, indistinct in one direction
Mohs Hardness
3.56
2
10
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Chemical Composition
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]