Tenacity
-
-
Solubility
insoluble in common solvents
-
Durability
-
-
Specific Gravity
2.653.85-3.94
1
7.18
👆🏻
Fracture
Conchoidal, ConchoidalWalter Schumann
Conchoidal, Uneven
Cleavage
Indiscernible
{010} Good, {100} Distinct
Mohs Hardness
75-5.5
2
10
👆🏻
Chemical Composition
SiO2
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)