Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.942.7-3.3
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Uneven, Even
Cleavage
{010} Good, {100} Distinct
Perfect on the {001}
Mohs Hardness
5-5.52.5-3.0
2
10
👆🏻
Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
K(Mg,Fe++)3[AlSi3O10(OH,F)2