Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.753.19-3.56
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
{110} Perfect, {010} Indistinct
Mohs Hardness
4.5-55.5-6
2
10
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Chemical Composition
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)