Tenacity
-
Brittle
Solubility
Partially soluble in water
-
Durability
-
-
Specific Gravity
1.772.72-2.75
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
Perfect on {10 1 0}
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
2-2.56-6.5
2
10
👆🏻
Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)