Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.752.90-2.98
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Mohs Hardness
4.5-53.5
2
10
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Chemical Composition
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references