Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-2.982.60-2.65
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
3.56-6.5
2
10
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Chemical Composition
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)