Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.755.50-5.90
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
On {10 1 0}, perfect; parting on {000 1 }
Mohs Hardness
4.5-54
2
10
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Chemical Composition
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)