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Characterization and crystal chemistry of an Fe-rich montmorillonite from Ölberg; Germany

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Abstract:

An Fe-rich smectite from Ölberg (Germany) was characterized using X-ray diffraction, infrared spectroscopy and analytical electron microscopy. Progressive reduction of the octahedral charge was performed through the Hofmann & Klemen effectatincreasing temperatures. The sample was heterogeneous, consisting of two smectite populations. One population, which comprises a minor portion of the sample, is an 'Fe3+-montmorillonite' with little or no tetrahedral charge and Fe3+ as the major octahedral cation. The other population, a sample, contains less Mg and more Al than the first one and exhibits some tetrahedral charge. This fraction may be considered as an inter-grade between nontronite (dominant tetrahedral charge) and Fe3+-montmorillonite (dominant octahedral charge). These two populations may occur as separate particles but also as interstratified layers. major constituent of the

Keywords: AEM; CHARGE DISTRIBUTION; CLAY MINERAL; CRYSTAL CHEMISTRY; FE-MONTMORILLONITE; FTIR; GERMANY; OLBERG; XRD

Document Type: Research Article

DOI: https://doi.org/10.1180/0009855023720034

Publication date: 2002-06-01

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