Tenacity
Brittle
Brittle
Solubility
Dilute acid
-
Durability
-
-
Specific Gravity
2.93-2.962.72-2.75
1
7.18
👆🏻
Fracture
Subconchoidal, Conchoidal
Uneven
Cleavage
Distinct on {010}, imperfect {110} and {011}
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
3.5-46-6.5
2
10
👆🏻
Chemical Composition
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)