Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.815.6-5.76
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Uneven
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
[001] perfect; [100] distinct
Mohs Hardness
8.52.5-3
2
10
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Chemical Composition
BeAl 2 O 4
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)