Tenacity
Brittle
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.72-2.752.36
1
7.18
👆🏻
Fracture
Uneven
Uneven, Subconchoidal, Fibrous
Cleavage
Perfect on [001], good on [010], imperfect on [110]
[110] perfect, [101] good, [010] distinct
Mohs Hardness
6-6.53.5-4
2
10
👆🏻
Chemical Composition
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references