Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.373.31
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
-
Cleavage
Perfect on {010}, good on {100}
Indiscernible
Mohs Hardness
7.5-9999
2
10
👆🏻
Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
NaFe 3+ 3 Al 6 (BO 3 ) 3 Si 6 O 18 (O,F,OH) 4 Anthony et al, Handbook of mineralogy (2001)