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Clay Minerals; September 2002; v. 37; no. 3; p. 517-529; DOI: 10.1180/0009855023730050
© 2002 Mineralogical Society of Great Britain and Ireland
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Research Paper

Fe-rich smectites from Gafsa (Tunisia): characterization and pillaring behaviour

S. LETAÏEF1,2, B. CASAL2, N. KBIR-ARIGUIB3, M. TRABELSI-AYADI1 and E. RUIZ-HITZKY2,*

1 L.P.C.M. Faculté des Sciences de Bizerte, Zarzouna Bizerte, Tunisia, 2 Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain, and 3 Institut Nationale de la Recherche Scientifique et Technique, Borj-Cédria, 2050 Hammam-Lif, Tunisia

* E-mail: eduardo{at}icmm.csic.es

(Received 24 May 2001; revised 19 February 2002)

Three raw samples of Fe-rich smectites from Gafsa (Jebels Shemsi and Hammadi, Tunisia) have been characterized by different techniques which indicate that they contain (15–20%) illite, probably interstratified and to a lesser extent they also contain kaolinite, calcite, quartz and Fe oxides. These samples present a relatively high Fe content (~9%) in the <2 µm fraction. From EPR and Mössbauer spectroscopy it is deduced that Fe is mainly present as Fe(III) in the octahedral environment of smectites and also in Fe-oxyhydroxides associated with the clays. Aluminium-pillared clays have been prepared from the Na+-purified samples, and their thermal stability and acidity have been studied.

KEYWORDS: Fe-rich smectite, bentonite, pillared clays, EPR, Mössbauer, IR




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Y. SEKI and K. YURDAKOC
Identification and characterization of Fe-rich smectites in the Camlica Region of western Turkey
Clay Minerals, June 1, 2007; 42(2): 153 - 160.
[Abstract] [Full Text] [PDF]


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