Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.942.72-2.83
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Uneven
Cleavage
{010} Good, {100} Distinct
Good on {100} and {110}
Mohs Hardness
5-5.56-7
2
10
👆🏻
Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
Na 2(Ti,Fe)Si 4(O,F) 11Ulrich Henn and Claudio C.