1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.4 Solubility
Not Available
Not Available
1.7 Durability
Not Available
Not Available
1.9 Specific Gravity
2.58-2.643.05-3.21
1
7.18
1.16 Fracture
Gems, Sixth Edition (2006)
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
1.17 Cleavage
None
Good on {110}, poor on {100}
1.18 Mohs Hardness
1.19 Chemical Composition
SiO2 (with a high level of nickel impurities )
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references