Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.756.50-7.00
1
7.18
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Fracture
Conchoidal
Irregular, Conchoidal
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
4.5-53
2
10
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Chemical Composition
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
PbMoO 4Walter Schumann , Gemstones of the world (2001)