Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.72-2.752.9-3.5
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
Perfect on [001], good on [010], imperfect on [110]
{110} Perfect, {???} Distinct, {???} Distinct
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)
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)