Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.082.72-2.75
1
7.18
👆🏻
Fracture
Subconchoidal, Uneven, Conchoidal
Uneven
Cleavage
Poor on {100}
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
56-6.5
2
10
👆🏻
Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)