Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.374.00-4.62
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Conchoidal, Uneven
Cleavage
Perfect on {010}, good on {100}
Indistinct parting on [111]
Mohs Hardness
7.57.5-8
2
10
👆🏻
Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)