Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.312.33-2.37
1
7.18
👆🏻
Fracture
-
ConchoidalWalter Schumann
Cleavage
Indiscernible
Perfect on {010}, good on {100}
Mohs Hardness
-99997.5
2
10
👆🏻
Chemical Composition
NaFe 3+ 3 Al 6 (BO 3 ) 3 Si 6 O 18 (O,F,OH) 4 Anthony et al, Handbook of mineralogy (2001)
Be 2BO 3(OH)Ulrich Henn and Claudio C.