Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.813.05-3.08
1
7.18
👆🏻
Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Subconchoidal, Uneven, Conchoidal
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
Poor on {100}
Mohs Hardness
8.55
2
10
👆🏻
Chemical Composition
BeAl 2 O 4
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)