Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.353.76-3.77
1
7.18
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Fracture
Conchoidal
-
Cleavage
Perfect on {100}, imperfect on {001}
{110} Perfect, {110} Perfect
Mohs Hardness
2.55-6
2
10
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Chemical Composition
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.