International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

Native selenium as a byproduct of microbial oxidation of distorted pyrite crystals: the first occurrence in the Carpathians

Pages: 231 - 236

Authors: ELIGIUSZ SZELEG, JANUSZ JANECZEK, PAWEL METELSKI

Abstract: Acicular crystals of native selenium up to 30 µm long occur together with barite on the surface of goethite partial pseudomorphs after millimeter-sized pseudotetragonal-prismatic pyrite crystals in calcite veins that cross-cut Senonian sandstones of the Silesian Nappe in the western Polish Outer Carpathians. Native selenium originated from selenium apparently released during bacteria-induced oxidation of pyrite at neutral or near-neutral pH conditions. Oxidizing bacteria preferentially colonized {100} faces of pyrite relative {111} faces.

Keywords: Outer Carpathians, Poland, bacterial oxidation, goethite, pyrite, native selenium

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