Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.642.62-2.67
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
Uneven
Cleavage
Absent
From the Greek, oligos and kasein, little cleavage.
Mohs Hardness
6.5-76-6.5
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)