Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.943-3.15
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Conchoidal
Cleavage
{010} Good, {100} Distinct
Good on [110] and on [001]
Mohs Hardness
5-5.56.0-6.5
2
10
👆🏻
Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
[ ]Na2(Mg3Al2)Si8O22(OH)2