Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.773.70-3.90
1
7.18
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Fracture
-
Conchoidal
Cleavage
{110} Perfect, {110} Perfect
Perfect on {011}, fair on {100}, poor on {110}
Mohs Hardness
5-63.5-4
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
Cu 3(OH) 2(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references