Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.943.76-3.77
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
-
Cleavage
{010} Good, {100} Distinct
{110} Perfect, {110} Perfect
Mohs Hardness
5-5.55-6
2
10
👆🏻
Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.