Tenacity
Brittle
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
5.6-5.765.00-5.20
1
7.18
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Fracture
Uneven
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
[001] perfect; [100] distinct
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
2.5-36-6.5
2
10
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Chemical Composition
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references