Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.58-2.643.08-3.12
1
7.18
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Fracture
-
ConchoidalWalter Schumann
Cleavage
None
{010} Perfect
Mohs Hardness
6.5-77.5
2
10
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Chemical Composition
SiO2 (with a high level of nickel impurities )
BeAlSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references