Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.56-2.663.05-3.08
1
7.18
👆🏻
Fracture
Uneven, ConchoidalWalter Schumann
Subconchoidal, Uneven, Conchoidal
Cleavage
Distinct
Poor on {100}
Mohs Hardness
7-7.55
2
10
👆🏻
Chemical Composition
Mg 2Al 4Si 5O 18Ulrich Henn and Claudio C.
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)