Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.353.43-3.44
1
7.18
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Fracture
Conchoidal
-
Cleavage
Perfect on {100}, imperfect on {001}
None Observed
Mohs Hardness
2.56.5-7
2
10
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Chemical Composition
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references