Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.50-5.903.76-3.77
1
7.18
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Fracture
Conchoidal
-
Cleavage
On {10 1 0}, perfect; parting on {000 1 }
{110} Perfect, {110} Perfect
Mohs Hardness
45-6
2
10
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Chemical Composition
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.