Clays and Clay Minerals, Vol. 59, No. 1, 3–9, 2011
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Authors
Christiansen, B.C.
Dideriksen, K.
Skovbjerg, L.L.
Nedel, S.
Stipp, S.L.S.
Issue Date
2011
Type
Article
Language
Keywords
Periodicals , Geology , Fougerite , Green Rust , IMA 2003-057 , Mineral Ambiguity
Alternative Title
Letter To The Editor On Fougerite
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 Fouge`res 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.
Description
gsccm59102-chr.pdf-- 195KB
Citation
Clays and Clay Minerals, Vol. 59, No. 1, 3–9, 2011
Publisher
License
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