Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.702.72-2.75
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
None
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
6.5-76-6.5
2
10
👆🏻
Chemical Composition
SiO 2 (with trace Cr minerals) Gemdat.org , Management Team (2012)
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)