Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.6-5.763.69-3.81
1
7.18
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Fracture
Uneven
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
[001] perfect; [100] distinct
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
2.5-38.5
2
10
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Chemical Composition
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)
BeAl 2 O 4