Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.72-2.752.55-2.63
1
7.18
👆🏻
Fracture
Uneven
Uneven
Cleavage
Perfect on [001], good on [010], imperfect on [110]
{001} Perfect, {010} Good
Mohs Hardness
6-6.56-6.5
2
10
👆🏻
Chemical Composition
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
KAlSi 3O 8Arthur Thomas , Gemstones (2009)