1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.62-2.673.69-3.81
1
7.18
1.5 Fracture
Gems, Sixth Edition (2006), Gems, Sixth Edition (2006), Uneven
Not Available
1.6 Cleavage
From the Greek, oligos and kasein, little cleavage.
Not Available
1.7 Mohs Hardness
1.8 Chemical Composition
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
BeAl 2O 4Arthur Thomas , Gemstones (2009)