General Information:
Chemical Formula:
Mn9(SiO4)4(OH,F)2
Composition:
(Molecular Weight = 897.79 gm)
Manganese 55.07 % Mn
Silicon 12.51 % Si
Hydrogen 0.17 % H
Oxygen 31.19 % O
Fluorine 1.06 % F
Empirical Formula:
Mn2+9(SiO4)4(OH)1.5F0.5
IMA Status:
Approved IMA 1963
Physical Properties:
Cleavage:
[???] Indistinct
Color:
dark brown, dark reddish brown, pink brown, or reddish orange.
Density:
3.82
Diaphaniety:
Transparent to Translucent
Hardness:
5.5 - Knife Blade
Luster:
Vitreous (Glassy)
More details...