Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.085.6-5.76
1
7.18
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Fracture
Uneven, Irregular, Conchoidal
Uneven
Cleavage
None
[001] perfect; [100] distinct
Mohs Hardness
6.52.5-3
2
10
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Chemical Composition
Ca 3Al 2(SiO 4) 3-x(OH) 4x (x=0.2 to 1.5)Anthony et al , Handbook of mineralogy (2001)
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)