Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.082.97-3.03
1
7.18
👆🏻
Fracture
Subconchoidal, Uneven, Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Poor on {100}
{001} Poor
Mohs Hardness
57
2
10
👆🏻
Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
CaB 2(SiO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references