Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.6-5.762.25-2.40
1
7.18
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Fracture
Uneven
-
Cleavage
[001] perfect; [100] distinct
perfect on {010}; good on {100}
Mohs Hardness
2.5-35-5.5
2
10
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Chemical Composition
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)
NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references