Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.753.89-4.18
1
7.18
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Fracture
Conchoidal
Conchoidal, Uneven
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
{0001}, {11 2 0} imperfect
Mohs Hardness
4.5-55.5
2
10
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Chemical Composition
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references