Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.72-2.753.19-3.56
1
7.18
👆🏻
Fracture
Uneven
Uneven, Conchoidal
Cleavage
Perfect on [001], good on [010], imperfect on [110]
{110} Perfect, {010} Indistinct
Mohs Hardness
6-6.55.5-6
2
10
👆🏻
Chemical Composition
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)