Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.774.32-4.48
1
7.18
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Fracture
-
Uneven, Subconchoidal, Conchoidal
Cleavage
{110} Perfect, {110} Perfect
{101}, good; {010}, poor
Mohs Hardness
5-63.5
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)