Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.083-3.15
1
7.18
👆🏻
Fracture
Subconchoidal, Uneven, Conchoidal
Conchoidal
Cleavage
Poor on {100}
Good on [110] and on [001]
Mohs Hardness
56.0-6.5
2
10
👆🏻
Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
[ ]Na2(Mg3Al2)Si8O22(OH)2