Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.313.2-3.4
1
7.18
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Fracture
-
Uneven
Cleavage
Indiscernible
Perfect on [001] imperfect on [100]
Mohs Hardness
-99993
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)
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)