Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.373.355-3.433
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Uneven
Cleavage
Perfect on {010}, good on {100}
{???} Good, {???} Good
Mohs Hardness
7.5-9999
2
10
👆🏻
Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)