Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.72-2.752.69-2.79
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
Perfect on [001], good on [010], imperfect on [110]
Poor on {0001}
Mohs Hardness
6-6.55.5-6.5
2
10
👆🏻
Chemical Composition
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
KNa 2(Fe3+ ,Mn3+ ,Al) 2Li 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references