Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.774.32-4.48
1
7.18
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Fracture
Uneven
Uneven, Subconchoidal, Conchoidal
Cleavage
Perfect [001] good [010] poor [110]
{101}, good; {010}, poor
Mohs Hardness
6-6.53.5
2
10
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Chemical Composition
CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)