Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.6-5.762.70-2.75
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
[001] perfect; [100] distinct
From the Greek for luster, for its pearly luster on the cleavage.
Mohs Hardness
2.5-34.5-5
2
10
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Chemical Composition
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)