Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.942.6-3.3
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Lamellar
Cleavage
{010} Good, {100} Distinct
Perfect 001
Mohs Hardness
5-5.52-2.5
2
10
👆🏻
Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6