Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.755.85-6.15
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
Fair in four directions forming octahedrons
Mohs Hardness
4.5-53.5-4
2
10
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Chemical Composition
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references