Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.85-3.943.10-3.20
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Uneven, Conchoidal
Cleavage
{010} Good, {100} Distinct
Poor to good on (001)
Mohs Hardness
5-5.56-6.5
2
10
👆🏻
Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
(Mg,Fe) 5(SiO 4) 2(F,OH) 2Ulrich Henn and Claudio C.