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Stunning Cacoxenite Crystals

Stunning Cacoxenite Crystals. From: La Paloma Mine, Zarza la Mayor, Cáceres, Extremadura, Spain. Photo: Rewitzer Christian

Cacoxenite

Formula: Fe³⁺₂₄Al(PO₄)₁₇O₆(OH)₁₂·17(H₂O)
System: Hexagonal
Colour: Yellow to brownish ...
Hardness: 3 - 4

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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