Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.76-3.773.25-3.35
1
7.18
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Fracture
-
Conchoidal, ConchoidalWalter Schumann
Cleavage
{110} Perfect, {110} Perfect
Perfect in three directions
Mohs Hardness
5-65
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references