Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.2-3.42.33-2.37
1
7.18
👆🏻
Fracture
Uneven
ConchoidalWalter Schumann
Cleavage
Perfect on [001] imperfect on [100]
Perfect on {010}, good on {100}
Mohs Hardness
37.5
2
10
👆🏻
Chemical Composition
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Be 2BO 3(OH)Ulrich Henn and Claudio C.