Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.753.32-3.43
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
Poor on {110} and {100} very poor on {001}
Mohs Hardness
4.5-56-7
2
10
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Chemical Composition
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4