Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.6-5.762.55-2.65
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
[001] perfect; [100] distinct
Perfect {10 1 0}
Mohs Hardness
2.5-35.5-6
2
10
👆🏻
Chemical Composition
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)