1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Subconchoidal, Conchoidal, Brittle
Brittle, Metallic, Brittle, Metallic
1.6 Cleavage
Fair on {100}, poor on {001} and {010}
{110} Perfect, {010} Perfect
1.7 Mohs Hardness
1.8 Chemical Composition
Mg2Al4Si5O18
Na 2ZrSi 3O 9 · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)