Tenacity
-
-
Solubility
-
Partly soluble in HCl.
Durability
-
-
Specific Gravity
3.313.32-3.43
1
7.18
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Fracture
-
Conchoidal
Cleavage
Indiscernible
{100} perfect; {110} and {1 1 0} good; {010} poor
Mohs Hardness
-99995.5-6
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)
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references