Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.502.62-2.67
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Uneven
Cleavage
None
From the Greek, oligos and kasein, little cleavage.
Mohs Hardness
76-6.5
2
10
👆🏻
Chemical Composition
Mn 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006)
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)