Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
4.32-4.482.60-2.65
1
7.18
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Fracture
Uneven, Subconchoidal, Conchoidal
Uneven, Conchoidal
Cleavage
{101}, good; {010}, poor
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
3.56-6.5
2
10
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Chemical Composition
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)