Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.62-2.672.60-2.64
1
7.18
👆🏻
Fracture
Uneven
Uneven, Splintery, Conchoidal
Cleavage
From the Greek, oligos and kasein, little cleavage.
Absent
Mohs Hardness
6-6.56.5-7
2
10
👆🏻
Chemical Composition
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
SiO 2Arthur Thomas , Gemstones (2009)