cacoxenite

cacoxenite

[kə′käk·sə‚nīt]
(mineralogy)
Fe4(PO4)3(OH)3·12H2O Yellow or brownish mineral consisting of a hydrous basic iron phosphate occurring in radiated tufts.
References in periodicals archive ?
Horizon C (695-740 cm) contains a high proportion of illite, quartz and a small amount of plagioclase, kaolinite and cacoxenite.
The intense yellow-orange color of the karbibite is spectacular, recalling cacoxenite, with which it can be confused if one ignores the associated species.
After the visit, Embrey sent Kay a reprint of Laubmann and Steinmetz's 1923 description of Hagendorf "xanthoxenite": the authors' sketch showed a single crystal resting on one of a clump of jumbled (wirrstrahlige) yellow acicular crystals which they called cacoxenite. Kay realized that the "xanthoxenite" of Laubmann and Steinmetz was probably stewartite--"no other mineral from that locality looks like that!" she insisted--and that the yellow jumbled crystals were not cacoxenite (which is never wirrstrahlige at Hagendorf) but strunzite--and later research proved her right.
Cacoxenite (Fe,Al)[.sub.25](P[O.sub.4])[.sub.17][O.sub.6](OH)[.sub.12] * 75[H.sub.2]O(SO)
Other minerals present in attractive, smaller crystals or coatings include cacoxenite, crandallite, dufrenite, gypsum, jarosite, native selenium and strengite/variscite.
Cacoxenite [([Fe.sup.3+],Al).sub.25][([PO.sub.4]).sub.17][O.sub.6][(OH).sub.12].
Cacoxenite occurs rarely as lustrous, pale yellow, hourglass-shaped acicular bundles a few tenths of a millimeter in length, in vugs in feldspar.
At the Brewer mine east of Cedartown, Georgia, similar veins of green and blue-green planerite occur along with wavellite, crandallite, aluminum-strengite and cacoxenite. Rarely, the planerite from the Brewer mine forms distinct green crystals and appears very similar to the material from the Coon Creek mine in Arkansas.
Excellent crystallized cacoxenite is present at location 1 on the 5,375 bench.
Beau Gordon (Jendon Minerals) found some excellent phosphate microcrystals at the Red Ball mine, Calhoun County, including golden yellow cacoxenite, gray-green botryoidal kidwellite, pink strengite and colorless, transparent wavellite.
The Red Ball mine, Calhoun County, Alabama, was once a source of iron for Confederate cannon, and now is a source of colorful strengite, cacoxenite, beraunite, and kidwellite in earthy brown "bog iron" matrixes.
First, in the Bilbao show, Javier Garcia from Madrid had about two dozen cacoxenite specimens, some associated with heraunite, found on the dumps in the summer of 1994.