Tenacity
Brittle
-
Solubility
-
Partially soluble in water
Durability
-
-
Specific Gravity
2.72-2.751.77
1
7.18
👆🏻
Fracture
Uneven
-
Cleavage
Perfect on [001], good on [010], imperfect on [110]
Perfect on {10 1 0}
Mohs Hardness
6-6.52-2.5
2
10
👆🏻
Chemical Composition
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)