Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.773.43-3.44
1
7.18
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Fracture
-
-
Cleavage
{110} Perfect, {110} Perfect
None Observed
Mohs Hardness
5-66.5-7
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references