1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.72-2.753.55-3.70
1
7.18
1.5 Fracture
Uneven, Uneven, Gems, Sixth Edition (2006)
Gemstones (2009)
1.6 Cleavage
Perfect on [001], good on [010], imperfect on [110]
Not Available
1.7 Mohs Hardness
1.8 Chemical Composition
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Al 2SiO 5Arthur Thomas , Gemstones (2009) More from other references