1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.57-2.662.60-2.65
1
7.18
1.5 Fracture
Subconchoidal, Conchoidal, Brittle
Uneven, Uneven, Gems, Sixth Edition (2006), Uneven, Conchoidal
1.6 Cleavage
Fair on {100}, poor on {001} and {010}
Perfect on {001}, very good on {010}, imperfect on {110}
1.7 Mohs Hardness
1.8 Chemical Composition
Mg2Al4Si5O18
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)