Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.313.85-3.94
1
7.18
👆🏻
Fracture
-
Conchoidal, Uneven
Cleavage
Indiscernible
{010} Good, {100} Distinct
Mohs Hardness
-99995-5.5
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)
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)