Abstract

A comprehensive Mossbauer spectroscopic and X-ray diffraction study of six purified glauconites is presented The Mossbauer spectra were computer-fitted with three Fe (super 3+) and three Fe (super 2+) doublets, both Fe species occupying the trans-OH and two cis-OH octahedral sites. In addition, a seventh smaller doublet is assigned to Fe (super 3+) in tetrahedral coordination. It has been shown that an increasing IV Fe (super 3+) content directs VI Fe (super 3+) substitution to the cis-OH octahedrally coordinated sites. A correlation between the d(060) reflection and elemental composition is demonstrated.

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