Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.263.85-3.94
1
7.18
👆🏻
Fracture
Uneven
Conchoidal, Uneven
Cleavage
None
{010} Good, {100} Distinct
Mohs Hardness
-99995-5.5
2
10
👆🏻
Chemical Composition
NaFe3+3Fe3+6(BO 3) 3Si 6O 18(O,OH) 4Anthony et al , Handbook of Mineralogy (2001)
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)