Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-2.983.69-3.81
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
3.58.5
2
10
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Chemical Composition
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
BeAl 2 O 4