Abstract
Three-layer type iron bearing clay minerals, Illite and Montmorillonite, have been analyzed by Mossbauer effect with a view to find the oxidation state, coordination symmetry and site distortion of the iron ion. Furthermore, these samples were treated with concentrated solutions of Fe(NO 3 ) 3 , pH 0.1 to study the exchange of cations. It is concluded that in the natural samples of Montmorillonite and Illite, Fe 3+ ion is in the alumina octahedra in place of Al 3+ ion. In the case of Montmorillonite, treated with ferric nitrate solution, the iron ion is taken up in three inequivalent sites of cubic symmetry: into the vacant sites of Si tetrahedra as [FeO 4 ] - , in the basal plane and on the broken edges. In the case of Illite, the main exchange location for Fe 3+ is the broken edge and only a small amount goes into the basal plane.
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