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Fe(II)/Fe(III) ‘green rust’ developed within ochreous coal mine drainage sediment in South Wales, UK

Published online by Cambridge University Press:  05 July 2018

J. M. Bearcock ,
W. T. Perkins ,
E. Dinelli  and
S. C. Wade
J. M. Bearcock*
Affiliation:
Institute of Geography and Earth Sciences, University of Wales, Aberystwyth SY23 3DB, UK
W. T. Perkins
Affiliation:
Institute of Geography and Earth Sciences, University of Wales, Aberystwyth SY23 3DB, UK
E. Dinelli
Affiliation:
Bologna University, Piazza di Porta San Donato, 1, Bologna, I-40126, Italy
S. C. Wade
Affiliation:
Institute of Biological Sciences, University of Wales, Aberystwyth SY23 3DA, UK
*
*E-mail: [email protected]
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Abstract

‘Green rusts’ are a group of reduced Fe hydroxides with a pyroaurite-like structure. In a new occurrence, green rust is present as a 45–60 mm thick band which lies just below the surface (∼4 mm) of an ochreous deposit at an abandoned coal mine site. The sample is characterized by the presence of μm-sized hexagonal crystals which have been identified from SEM imaging. Chemical analyses reveal an Fe(II):Fe(III) ratio which is close to the characteristic 2:1 ratio, and XRD analysis identifies the material by characteristic lattice spacings. The green rust layer also contains aragonite which is not present in the surrounding ochre. Green rusts are important as they have the potential to be used in water treatment.

Keywords

Green rustcoal mineochredrainageSouth Wales
Type
Letter
Information
Mineralogical Magazine , Volume 70 , Issue 6 , December 2006 , pp. 731 - 741
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2006

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