Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
4.00-4.652.72-2.75
1
7.18
👆🏻
Fracture
Uneven, Sub-Conchoidal
Uneven
Cleavage
Perfect on [1011]
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
5-5.56-6.5
2
10
👆🏻
Chemical Composition
ZnCO 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)