Tenacity
Brittle
-
Solubility
-
Partially soluble in water
Durability
-
-
Specific Gravity
5.6-5.761.77
1
7.18
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Fracture
Uneven
-
Cleavage
[001] perfect; [100] distinct
Perfect on {10 1 0}
Mohs Hardness
2.5-32-2.5
2
10
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Chemical Composition
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)