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Cacoxenite

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Category
  
Phosphate minerals

Crystal system
  
Hexagonal

Strunz classification
  
8.DC.40

Space group
  
P63/m

Cacoxenite

Formula(repeating unit)
  
Fe24Al(PO4)17O6(OH)12·17(H2O)

Crystal class
  
Dipyramidal (6/m)(same H-M symbol)

Cacoxenite is an iron aluminium phosphate mineral with formula: Fe3+24Al(PO4)17O6(OH)12·17(H2O). It is associated with iron ores. The name comes from the Greek κăκός for "bad" or "evil" and ξένος for "guest" because the phosphorus content of cacoxenite lessens the quality of iron smelted from ore containing it.

It was first described in 1825 for an occurrence in the Hrbek Mine, Bohemia, Czech Republic. It occurs as a secondary phase in oxidized magnetite and limonite deposits. It also occurs in novaculites and in iron and phosphorus rich sediments.

References

Cacoxenite Wikipedia


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