Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.753.87-4.14
1
7.18
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Fracture
Conchoidal
Subconchoidal, Conchoidal
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
Poor on {120}, in traces on {001}
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)
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references