Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.752.50
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
Distinct on {100} and {110}
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)
3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)