Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.58-2.643.00-3.15
1
7.18
👆🏻
Fracture
-
-
Cleavage
None
Indistinct
Mohs Hardness
6.5-75-5.5
2
10
👆🏻
Chemical Composition
SiO2 (with a high level of nickel impurities )
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006)