Letter to the editor : On fougerite
Christianse, B. C. (University of Copenhagen. Nano-Science Center. Department of Chemistry)
Dideriksen, K. (University of Copenhagen. Nano-Science Center. Department of Chemistry)
Skovbjerg, L. L. (University of Copenhagen. Nano-Science Center. Department of Chemistry)
Nedel, S. (University of Copenhagen. Nano-Science Center. Department of Chemistry)
Stipp, S. L. S. (University of Copenhagen. Nano-Science Center. Department of Chemistry)

Date:	2011
Abstract:	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.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Fougerite ; Green Rust ; IMA 2003-057 ; Mineral Ambiguity
Published in:	Clays and Clay Minerals, Vol. 59, Núm. 1 (2011) , p. 3-9, ISSN 1552-8367

DOI: 10.1346/CCMN.2011.0590102

7 p, 361.8 KB  UAB restricted access

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