Tenacity
-
Slightly sectile
Solubility
-
1.04 x 10−25 g per 100 ml water (Ksp at 25°C = 2 x 10−32)
Durability
-
-
Specific Gravity
3.312
1
7.18
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Fracture
-
Uneven
Cleavage
Indiscernible
Prismatic {10 1 0}, perfect
Mohs Hardness
-99992-2.5
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)
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references