General Information:
Chemical Formula:
NaCa2(Fe++,Mn++)4MgFe+++(PO4)6·2(H2O)
Composition:
(Molecular Weight = 1,011.64 gm)
Sodium 2.27 % Na
Calcium 7.92 % Ca
Magnesium 2.40 % Mg
Manganese 5.43 % Mn
Iron 22.08 % Fe
Phosphorus 18.37 % P
Hydrogen 0.40 % H
Oxygen 41.12 % O
Empirical Formula:
NaCa24(Fe2+0.75)4(Mn2+0.25)MgFe3+(PO4)6·2(H2O)
IMA Status:
Approved IMA 1979
Physical Properties:
Cleavage:
[010] Good
Color:
bluish black, dark blue, or black.
Density:
3.54
Hardness:
4.5-5
Luster:
Sub Metallic
Streak:
green
More details...