Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.082.78
1
7.18
👆🏻
Fracture
Subconchoidal, Uneven, Conchoidal
Uneven, Conchoidal
Cleavage
Poor on {100}
{???} Distinct, {???} Indistinct
Mohs Hardness
55-6
2
10
👆🏻
Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
3CaAl 2Si 2O 8 · CaCO 3Anthony et al , Handbook of mineralogy (2001)