Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
1.98-2.504.32-4.48
1
7.18
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Fracture
ConchoidalWalter Schumann
Uneven, Subconchoidal, Conchoidal
Cleavage
None
{101}, good; {010}, poor
Mohs Hardness
5.5-6.53.5
2
10
👆🏻
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)