Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.775.35
1
7.18
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Fracture
-
Conchoidal
Cleavage
{110} Perfect, {110} Perfect
Perfect on {100}, imperfect on {001}
Mohs Hardness
5-62.5
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)