Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.5-4.83.85-3.94
1
7.18
👆🏻
Fracture
Uneven
Conchoidal, Uneven
Cleavage
None, parting may develop along {111}
{010} Good, {100} Distinct
Mohs Hardness
5.55-5.5
2
10
👆🏻
Chemical Composition
Fe++Cr2O4
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)