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Mineralpedia Details for Cacoxenite

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Cacoxenite

Cacoxenite

Named for the Greek words kakos, meaning “bad,” and xenizomenos, meaning “guest,” in reference to its presence in iron ores, which the phosphate content of the mineral degrades the quality of iron from the ore. Cacoxenite is an uncommon mineral in the broad sense, but is a common accessory in oxidized magnetite and limonite iron ore, and can also be found in iron and manganese bearing novaculites and in iron-rich sediment and soil. Localities for Cacoxenite are found in the Czech Republic, Germany, France, Ireland, Sweden, and the United States, among others. Orange, reddish orange, golden yellow, or brownish yellow acicular crystals in compact, concentric spherical to radial aggregates or coatings.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/cacoxenite.pdf


Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Crystal System
Hexagonal 
Crystal Habit
Radial, Acicular, Stellate 
Cleavage
None, None, None 
Luster
Silky 
Color
brownish yellow, green, yellow, golden yellow, red yellow 
Streak
yellow 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
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Cacoxenite from Union Carbide mine, Wilson Springs, Garland Co., Arkansas, United States

Cacoxenite
            from Union Carbide mine, Wilson Springs, Garland Co., Arkansas, United States

Golden acicular crystals in tiny 1mm and less radial balls.

Stunning golden brown, acicular radial sprays of Cacoxenite to 1mm.

Sprays of golden Cacoxenite to about 1mm well protected in a seam 6cm long and 1.5cm wide.

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Cacoxenite from Těškov quarry, SE of Prague, Bohemia, Czech Republic

Cacoxenite
            from Těškov quarry, SE of Prague, Bohemia, Czech Republic

Golden fibrous sprays to 1mm.

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Cacoxenite from San Salvador pit, Tyrone mine, New Mexico, United States

Cacoxenite
            from San Salvador pit, Tyrone mine, New Mexico, United States

Golden acicular sprays to about 0.75mm lining vugs.

Golden straw-like colored radial sprays of Cacoxenite to 0.5mm.

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Cacoxenite from South Rasmussen Ridge mine, Soda Springs, Caribou Co., Idaho, United States

Cacoxenite
            from South Rasmussen Ridge mine, Soda Springs, Caribou Co., Idaho, United States

Gold-yellow thin botryoidal Cacoxenite totally covering one side of black Shale matrix.

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Cacoxenite from Roosevelt mine, Custer Co., South Dakota, United States

Cacoxenite
            from Roosevelt mine, Custer Co., South Dakota, United States

Small orange sphericules of Cacoxenite less than 1mm.

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Cacoxenite from Three Oaks Gap, Polk Co., Arkansas, United States

Cacoxenite
            from Three Oaks Gap, Polk Co., Arkansas, United States

Cacoxenite as a thin orange film alteration over light green botryoidal Kidwellite and Dufrenite crystals to 4mm.

Sprays of Cacoxenite to 1mm.

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Cacoxenite from Moore's Mill, Cumberland Co., Pennsylvania, United States

Cacoxenite
            from Moore's Mill, Cumberland Co., Pennsylvania, United States

Golden yellow sprays to 1mm.

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Cacoxenite from Indian Mountain, Cherokee Co., Alabama, United States

Cacoxenite
            from Indian Mountain, Cherokee Co., Alabama, United States

Golden spherules and fibrous sprays of Cacoxenite with purple balls of Strengite.

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Cacoxenite from Kamariza mine, Laurium, Greece

Cacoxenite
            from Kamariza mine, Laurium, Greece

Golden fibrous hairs of Cacoxenite.

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Cacoxenite from Fumade, Castelnau-de-Brassac, Tarn, Midi-Pyrénées, France

Cacoxenite
            from Fumade, Castelnau-de-Brassac, Tarn, Midi-Pyrénées, France

Radial sprays of orange Cacoxenite to almost 1mm.

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Cacoxenite from Augusta Ridge, Cherokee Co., Alabama, United States

Cacoxenite
            from Augusta Ridge, Cherokee Co., Alabama, United States
Special Info
Specimen & Photo of: Henry Barwood Professor, Earth Science Department of Chemistry and Physics Troy University

The first two photos are those by Dr. Henry Barwood. Micro Cacoxenite fibers with well formed prisms and pyramidal terminations. FOV is about .6  X .4mm. Imaged with a Canon 40D, 23mm Nikon objective and 300mm Canon FD telephoto in a tube configuration and stacked using Combine Z software.

The second set were taken by Tom Loomis: Cacoxenite sprays to about 0.75mm. There is thick, rich coverage like carpet in places and also singular sprays throughout.

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Cacoxenite from Leveäniemi Iron mine, Svappavaara, Lappland, Sweden

Cacoxenite
            from Leveäniemi Iron mine, Svappavaara, Lappland, Sweden

Golden fibrous hairs of Cacoxenite in iron ore matrix of Hematite. Uncommon, at least on the market for this locality.

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