Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.773.89-4.18
1
7.18
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Fracture
-
Conchoidal, Uneven
Cleavage
{110} Perfect, {110} Perfect
{0001}, {11 2 0} imperfect
Mohs Hardness
5-65.5
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references