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Brochantite-2M2 from Pierre Plate Mine, Vizille

Published online by Cambridge University Press:  29 February 2012

Wilson A. Crichton  and
Harald Müller
Wilson A. Crichton
Affiliation:
European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble Cedex, France
Harald Müller
Affiliation:
European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble Cedex, France
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Abstract

Evidence for the recently described 2M2 polytype of brochantite from X-ray powder diffraction investigation of secondary alteration products of ore material from the Pierre Plate Mine, Vizille, Isère, France is presented. This report is the first to describe the 2M2 polytype from locations outside of Italy and through the use of powder XRD methods. In the procedure used herein, developed in a study by Merlino et al. [Eur. J. Mineral 15, 267–275 (2003)], we have used family reflections, common to both main types of brochantite, as the source of approximate cell parameters from which we obtain positions of characteristic reflections to demonstrate the unique choice of polytype, before final refinement stage. This method demonstrates that the determination of polytype is possible from powder data, for samples typical of both geological and urban environments. Least-squares refined cell parameters for the 2M2 polytype from Pierre Plate are a=12.7409(8) Å, b=9.8371(6) Å, c=6.0109(3) Å, and a=90.135(9)°, constrained in space group P21/n11.

Keywords

brochantitepolytypeX-ray powder diffractionalteration

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Type
NEW DIFFRACTION DATA
Information
Powder Diffraction , Volume 23 , Issue 3 , September 2008 , pp. 246 - 250
Copyright
Copyright © Cambridge University Press 2008

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