Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.50-3.604.32-4.48
1
7.18
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Fracture
Uneven
Uneven, Subconchoidal, Conchoidal
Cleavage
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
{101}, good; {010}, poor
Mohs Hardness
63.5
2
10
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Chemical Composition
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)