Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
4.00-4.622.33-2.37
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
ConchoidalWalter Schumann
Cleavage
Indistinct parting on [111]
Perfect on {010}, good on {100}
Mohs Hardness
7.5-87.5
2
10
👆🏻
Chemical Composition
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Be 2BO 3(OH)Ulrich Henn and Claudio C.