Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
1.98-2.503.98-4.04
1
7.18
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Fracture
ConchoidalWalter Schumann
Conchoidal
Cleavage
None
Imperfect, poor one {100}
Mohs Hardness
5.5-6.54.5-5
2
10
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Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references