Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.32-3.433.05-3.08
1
7.18
👆🏻
Fracture
Conchoidal
Subconchoidal, Uneven, Conchoidal
Cleavage
Poor on {110} and {100} very poor on {001}
Poor on {100}
Mohs Hardness
6-75
2
10
👆🏻
Chemical Composition
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)