General Information:
Chemical Formula:(Fe++,Mn)Fe+++4(PO4)3(OH)5
Composition:(Molecular Weight = 648.96 gm)Manganese 2.12 %
MnIron 40.88 %
FePhosphorus 14.32 %
P Hydrogen 0.78 %
H Oxygen 41.91 %
O Empirical Formula: Fe2+0.75Mn2+0.25Fe3+4(PO4)3(OH)5
Physical Properties: Cleavage:[100] Perfect, [010] Distinct, [001] Distinct
Color:green, dark olive green, black, brownish green, or reddish brown.
Density:3.3 - 3.49, Average = 3.39
Diaphaniety:Subtranslucent
Hardness:4.5 - Between Fluorite and Apatite
Luster:Vitreous - Dull
Streak:greenish gray
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