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Scanning Electron Microscopic and X-ray Powder Diffraction Study of Manganiferous Bauxite, Kincsesbánya, Hungary

Published online by Cambridge University Press:  02 April 2024

György Bárdossy ,
Anna Csordás-Toth  and
Annamária Klug
György Bárdossy
Affiliation:
Hungarian Aluminium Corporation, Budapest, Hungary
Anna Csordás-Toth
Affiliation:
HUNGALU Engineering and Development Centre, Budapest, Hungary
Annamária Klug
Affiliation:
HUNGALU Engineering and Development Centre, Budapest, Hungary
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Abstract

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Manganiferous karst bauxites are rare on a worldwide scale. One such body, recently mined at Kincsesbánya, Hungary, has been studied by chemical, petrographic, X-ray powder diffraction, scanning electron microscopic, and energy dispersive X-ray analytical techniques. The bauxite deposits of Kinesesbánya are of Paleocene to Lower Eocene age; however, the enrichment of manganese in them was a much later, epigenetic process. Lithiophorite is the main Mn mineral in this bauxite and occurs chiefly in dusters of < 1-μm size crystallites. Well-developed crystallites, however, 5–10 μm in size, line the walls of many microfissures and voids.

The oxidation of pyritic bauxite and lignitic clays in the overlying beds apparently mobilized finely disseminated Mn and Fe. Downward-migrating acidic solutions were gradually neutralized, and Mn and Fe minerals precipitated. The manganiferous bauxite was found only along the eastern rim of heavily eroded Middle Eocene sedimentary rocks. Here, epigenetic oxidation and mobilization were optimum. Farther to the east, pyrite-rich overburden and bauxite were apparently eroded away before Fe and Mn could be mobilized.

Keywords

AluminumBauxiteLithiophoriteManganeseScanning electron microscopyX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 33 , Issue 6 , December 1985 , pp. 532 - 538
Copyright
Copyright © 1985, The Clay Minerals Society

References

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