Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.843.85-3.94
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal, Uneven
Cleavage
none, may show indistinct parting
{010} Good, {100} Distinct
Mohs Hardness
7-7.55-5.5
2
10
👆🏻
Chemical Composition
(Mg,Fe)3Al2Si3O12
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)