Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.32-4.483.19-3.56
1
7.18
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Fracture
Uneven, Subconchoidal, Conchoidal
Uneven, Conchoidal
Cleavage
{101}, good; {010}, poor
{110} Perfect, {010} Indistinct
Mohs Hardness
3.55.5-6
2
10
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Chemical Composition
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)