Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.943.32-3.43
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Conchoidal
Cleavage
{010} Good, {100} Distinct
Poor on {110} and {100} very poor on {001}
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)
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4