Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.50-5.902.72-2.75
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
On {10 1 0}, perfect; parting on {000 1 }
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
46-6.5
2
10
👆🏻
Chemical Composition
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)