Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.62-2.673.63-3.9
1
7.18
👆🏻
Fracture
Uneven
Conchoidal, Uneven
Cleavage
From the Greek, oligos and kasein, little cleavage.
Indistinct
Mohs Hardness
6-6.57.5-8
2
10
👆🏻
Chemical Composition
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references