1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.72-2.753.21-3.38
1
7.18
1.5 Fracture
Uneven, Uneven, Gems, Sixth Edition (2006)
Irregular/uneven, Uneven
1.6 Cleavage
Perfect on [001], good on [010], imperfect on [110]
Perfect on {001}
1.7 Mohs Hardness
1.8 Chemical Composition
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Ca 2Al 3(SiO 4) 3(OH)Walter Schumann , Gemstones of the world (2001) More from other references