Stunning Cacoxenite Crystals
Stunning Cacoxenite Crystals. Photo: Honorio Cocera-La Parra


Cacoxenite

Formula: Fe3+24Al(PO4)17O6(OH) 12· 17(H2O)
System: Hexagonal
Colour: Yellow to brownish ...
Hardness: 3 – 4
From: Benetusser, Valencia, Spain


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.
 
Often times, it forms as fuzzy brownish yellow, brown, yellow, or gold radiated tufts or strands. It may also appear as reddish orange or greenish yellow. The cacoxenite is occasionally referred to cacoxene or cacoxitite.


 
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