Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.25-3.352.70-2.75
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Conchoidal
Cleavage
Perfect in three directions
From the Greek for luster, for its pearly luster on the cleavage.
Mohs Hardness
54.5-5
2
10
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Chemical Composition
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)