General Information:
Chemical Formula:
Mn++Fe+++4(PO4)3(OH)5
Composition:
(Molecular Weight = 648.28 gm)
Manganese 8.47 % Mn
Iron 34.46 % Fe
Phosphorus 14.33 % P
Hydrogen 0.78 % H
Oxygen 41.96 % O
Empirical Formula:
Mn2+Fe3+4(PO4)3(OH)5
Physical Properties:
Cleavage:
[100] Perfect, [010] Distinct, [001] Distinct
Color:
brown, brown green, brownish black, green black, or dark green.
Density:
3.476
Diaphaniety:
Subtranslucent
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Vitreous - Dull
Streak:
brownish gray
More details...