Tenacity
Brittle
Brittle
Solubility
Soluble
Slowly dissolves in water
Durability
-
-
Specific Gravity
3.30-3.50-9999
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Conchoidal
Cleavage
Perfect on {110}, poor on {101}, {001} rare
None
Mohs Hardness
53.5-4
2
10
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Chemical Composition
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
K2Mg2(SO4)3