Tenacity
Sectile
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.073.30-3.50
1
7.18
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Fracture
-
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Perfect on {010}, indistinct on {100} and {102}
Perfect on {110}, poor on {101}, {001} rare
Mohs Hardness
25
2
10
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Chemical Composition
Ni3(AsO4)2•8(H2O)
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references