Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.632.90-2.98
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
{001} Perfect, {010} Good
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Mohs Hardness
6-6.53.5
2
10
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Chemical Composition
KAlSi 3O 8Arthur Thomas , Gemstones (2009)
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references