Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.6-5.762.97-3.03
1
7.18
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Fracture
Uneven
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
[001] perfect; [100] distinct
{001} Poor
Mohs Hardness
2.5-37
2
10
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Chemical Composition
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)
CaB 2(SiO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references