1 Physical Properties
1.2 Tenacity
2.3 Solubility
Not Available
Not Available
2.6 Durability
Not Available
Not Available
2.9 Specific Gravity
2.60-2.652.58-2.64
1
7.18
2.17 Fracture
Uneven, Uneven, Gems, Sixth Edition (2006), Uneven, Conchoidal
Gems, Sixth Edition (2006)
2.18 Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
None
2.19 Mohs Hardness
4.4 Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
SiO2 (with a high level of nickel impurities )