General Information:
Chemical Formula:(Fe+++,Al)25(PO4)17O6(OH)12·75(H2O)
Composition:(Molecular Weight = 4,481.51 gm)Aluminum 3.76 %
AlIron 23.37 %
FePhosphorus 11.75 %
P Hydrogen 3.64 %
H Oxygen 57.48 %
O Empirical Formula: Fe2+18.75Al6.25(PO4)17O6(OH)12·75(H2O)
Name Origin:From the Greek kakos, meaning "wrong" and xenos, meaning "guest.;"
Physical Properties: Cleavage:None
Color:brownish yellow, green, yellow, golden yellow, or red yellow.
Density:2.3 - 3.4, Average = 2.84
Habits:Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Acicular - Occurs as needle-like crystals., Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.
Hardness:3-3.5 - Calcite-Copper Penny
Luminescence:None.
Luster:Silky
Streak:yellow
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