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Clays and Clay Minerals

, Volume 42, Issue 5, pp 643–651 | Cite as

Kaolinite/Montmorillonite Resembles Beidellite

  • J. Cuadros
  • A. Delgado
  • A. Cardenete
  • E. Reyes
  • J. Linares
Article

Abstract

A number of smectitic samples from Almeria (SE Spain) were studied by chemical analysis, DTA, TG, XRD (oriented aggregates with ethylene glycol treatment and Greene-Kelly test), FTIR and MAS NMR. Chemically they resembled a beidellite-montmorillonite series, displaying DTA/TG characteristics already quoted in the literature in beidellite descriptions. They did not swell after the Greene-Kelly test, as it has also been reported for some beidellites. Nevertheless XRD of the oriented, glycolated samples, FTIR, MAS NMR and revision of the chemical analysis demonstrated that they were mixed-layered kaolinite/montmorillonite. It is possible that some of the reported beidellites in the literature are kaolinite/montmorillonite. Beidellite characterization must be supported by several different techniques.

Key Words

Beidellite Greene-Kelly test Kaolinite/montmorillonite 

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Copyright information

© The Clay Minerals Society 1994

Authors and Affiliations

  • J. Cuadros
    • 1
  • A. Delgado
    • 1
  • A. Cardenete
    • 2
  • E. Reyes
    • 1
  • J. Linares
    • 1
  1. 1.U.E.I. Fisicoquímica y Geoquimica MineralEstación Experimental del Zooidín (C.S.I.C.)GranadaSpain
  2. 2.Departamento de Química FísicaFacultad de Ciencias Universidad de GranadaGranadaSpain

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