Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.773.7-3.9
1
7.18
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Fracture
-
Conchoidal
Cleavage
{110} Perfect, {110} Perfect
{001} perfect; {111} imperfect, may exhibit parting on , {011}
Mohs Hardness
5-65.5-6
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
MgOMichael OâDonoghue , Gems, Sixth Edition (2006)