Wicksite

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...