Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.313.69-3.81
1
7.18
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Fracture
-
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Indiscernible
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
-99998.5
2
10
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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)
BeAl 2 O 4