Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.51-2.533.85-3.94
1
7.18
👆🏻
Fracture
Conchoidal, Splintery
Conchoidal, Uneven
Cleavage
None
{010} Good, {100} Distinct
Mohs Hardness
55-5.5
2
10
👆🏻
Chemical Composition
KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)