Tenacity
Brittle
Brittle
Solubility
Gelatinises in acids
-
Durability
-
-
Specific Gravity
2.4-2.52.90-2.98
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
Distinct on {110}
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Mohs Hardness
5-63.5
2
10
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Chemical Composition
(Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references