Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-2.982.78
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.
{???} Distinct, {???} Indistinct
Mohs Hardness
3.55-6
2
10
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Chemical Composition
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
3CaAl 2Si 2O 8 · CaCO 3Anthony et al , Handbook of mineralogy (2001)