Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
-99992.33-2.37
1
7.18
👆🏻
Fracture
-
ConchoidalWalter Schumann
Cleavage
-
Perfect on {010}, good on {100}
Mohs Hardness
-99997.5
2
10
👆🏻
Chemical Composition
SiO2, Al2O3, CaO, MgO, FeO
Be 2BO 3(OH)Ulrich Henn and Claudio C.