Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.63-3.92.62-2.67
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Uneven
Cleavage
Indistinct
From the Greek, oligos and kasein, little cleavage.
Mohs Hardness
7.5-86-6.5
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)