Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3-3.152.72-2.75
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
Good on [110] and on [001]
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
6.0-6.56-6.5
2
10
👆🏻
Chemical Composition
[ ]Na2(Mg3Al2)Si8O22(OH)2
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)