Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.083.32-3.43
1
7.18
👆🏻
Fracture
Subconchoidal, Uneven, Conchoidal
Conchoidal
Cleavage
Poor on {100}
Poor on {110} and {100} very poor on {001}
Mohs Hardness
56-7
2
10
👆🏻
Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4