General Information:
Chemical Formula:
Fe++Fe+++4(PO4)3(OH)5·2(H2O)
Composition:
(Molecular Weight = 685.22 gm)
Iron 40.75 % Fe
Phosphorus 13.56 % P
Hydrogen 1.32 % H
Oxygen 44.36 % O
Empirical Formula:
Fe2+Fe3+4(PO4)3(OH)5·2(H2O)
Physical Properties:
Cleavage:
[???] Perfect, [???] Distinct
Color:
brown, greenish brown, green black, dark green, or olive green.
Density:
3.2 - 3.4, Average = 3.3
Diaphaniety:
Subtranslucent to opaque
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Fibrous - Crystals made up of fibers.
Hardness:
3.5-4 - Copper Penny-Flourite
Luminescence:
Non-fluorescent.
Luster:
Silky
Streak:
green
More details...