Tenacity
Brittle
Brittle
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.30-3.506.50-7.00
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Irregular, Conchoidal
Cleavage
Perfect on {110}, poor on {101}, {001} rare
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
53
2
10
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Chemical Composition
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
PbMoO 4Walter Schumann , Gemstones of the world (2001)