Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-3.022.62-2.67
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
Perfect
From the Greek, oligos and kasein, little cleavage.
Mohs Hardness
-99996-6.5
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)