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Crystallochemistry of Fe-rich palygorskite from eastern China

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Abstract:

Iron cations in the octahedral sheet are a disadvantage to the industrial application of palygorskite clays. In this study, a palygorskite sample from eastern China (Mayaoshan deposit, Jiangsu Province) is shown to have an Fe content that is much greater than usual. The structural formula of the Fe-rich palygorskite sample was established as (Si7.48 l0.52) (Al1.24Fe0.94Mg1.77Ti0.031.02)O20(OH)2(OH2)4. The palygorskite is seen to be dioctahedral according to the structural formula, consistent with Fourier transform infrared data. Occurrences of AlFe3+□OH and Fe3+Fe3+□OH vibrations in the OH-stretching and -bending regions show that Fe atoms occupy inner sites of octahedral sheets. A Mössbauer spectrum confirmed that Fe ions occupy inner octahedral sites as trivalent Fe cations (Fe3+).

Keywords: FE-RICH; FTIR; MOSSBAUER; OCTAHEDRAL OCCUPANCY; PALYGORSKITE

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/claymin.2007.042.4.03

Publication date: December 1, 2007

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