Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.375.05-5.22
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Uneven
Cleavage
Perfect on {010}, good on {100}
None
Mohs Hardness
7.55.5-6
2
10
👆🏻
Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
(Zn,Mn2+ ,Fe2+ )(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)