Abstract
Fougèrite mineral responsible for the bluish-green shade of gleysols in aquifers was identified as FeII − III oxyhydroxycarbonate, [Fe\(^{\rm II}_{6(1-x) }\)Fe\(^{\rm III}_{6x}\)O12H2(7 − 3x)]2 + · [CO\(_{3}^{2-}\) · 3H2O]2 − where the average ferric molar fraction x = [FeIII/Fetotal] was restricted to the [1/3–2/3] range, up till now. In this paper, Mössbauer spectra of gleys extracted from the schorre of maritime marshes have values of x in the [2/3–1] range. Magnetic properties of homologous chemical compounds studied by Mössbauer spectroscopy are explained with long range order of FeIII ions within Fe cation layers for x = 1/3, 2/3 and 1. Observed values are mixtures of topotactic domains that are in fact minerals with names proposed to IMA: fougèrite for x = 1/3, trébeurdenite for x = 2/3 and mössbauerite for x = 1.
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Génin, JM.R. et al. (2013). Redox topotactic reactions in FeII − III (oxy)hydroxycarbonate new minerals related to fougèrite in gleysols: “trébeurdenite and mössbauerite”. In: Yoshida, Y. (eds) ICAME 2011. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4762-3_9
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DOI: https://doi.org/10.1007/978-94-007-4762-3_9
Publisher Name: Springer, Dordrecht
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