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Letter to the Editor on Fougerite

Published online by Cambridge University Press:  01 January 2024

B. C. Christiansen*
Affiliation:
Nano-Science Center, Department of Chemistry, University of Copenhagen, Denmark
K. Dideriksen
Affiliation:
Nano-Science Center, Department of Chemistry, University of Copenhagen, Denmark
L. L. Skovbjerg
Affiliation:
Nano-Science Center, Department of Chemistry, University of Copenhagen, Denmark
S. Nedel
Affiliation:
Nano-Science Center, Department of Chemistry, University of Copenhagen, Denmark
S. L. S. Stipp
Affiliation:
Nano-Science Center, Department of Chemistry, University of Copenhagen, Denmark
*
* E-mail address of corresponding author: bochr@nano.ku.dk
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Abstract

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Fougerite (IMA 2003-057) was accepted by the Commission on New Minerals and Mineral Names of the International Mineralogical Association (IMA) in 2004 as a new mineral to represent the green rust (GR) family. The data on which it was approved, however, are inconsistent. X-ray diffraction patterns from the Fougères soils contain no peaks that could meaningfully be attributed to a GR phase. The sequential dissolution procedure used to identify GR in the soils was not rigorously tested for selectivity. If indeed it is selective, the results indicate the presence of 40–78% Fe in minerals other than GR. Other Fe-bearing phases were not included in the interpretation of the spectroscopy data that were presented. The data are consistent with the presence of Fe-bearing clays and other silicate minerals. In light of the ambiguous and conflicting data, we recommend that the case for fougerite as a mineral be re-evaluated by the IMA.

Type
Article
Copyright
Copyright © The Clay Minerals Society 2011

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