Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.752.9-3.5
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
{110} Perfect, {???} Distinct, {???} Distinct
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)
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)