Tenacity
Sectile
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.072.90-2.98
1
7.18
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Fracture
-
Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect on {010}, indistinct on {100} and {102}
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
27.5-8
2
10
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Chemical Composition
Ni3(AsO4)2•8(H2O)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references