Letter to the editor on fougerite

B.C. Christiansen, K. Dideriksen, L.L. Skovbjerg, S. Nedel, S.L.S. Stipp

Publikation: Bidrag til tidsskriftKommentar/debat

2 Citationer (Scopus)


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.

Sider (fra-til)3-9
Antal sider7
TidsskriftClays and Clay Minerals
Udgave nummer1
StatusUdgivet - feb. 2011
Udgivet eksterntJa


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