Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.32-4.481.98-2.50
1
7.18
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Fracture
Uneven, Subconchoidal, Conchoidal
ConchoidalWalter Schumann
Cleavage
{101}, good; {010}, poor
None
Mohs Hardness
3.55.5-6.5
2
10
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Chemical Composition
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)