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Crystal chemistry of zinc incorporation in strunzite-group minerals containing zeolitic water

Published online by Cambridge University Press:  02 January 2018

I. E. Grey*
Affiliation:
CSIRO Mineral Resources, Private Bag 10, Clayton, 3169, Victoria, Australia
E. Keck
Affiliation:
Algunderweg 3, D-92694 Etzenricht, Germany
C. M. MacRae
Affiliation:
CSIRO Mineral Resources, Private Bag 10, Clayton, 3169, Victoria, Australia
A. M. Glenn
Affiliation:
CSIRO Mineral Resources, Private Bag 10, Clayton, 3169, Victoria, Australia
A. R. Kampf
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA
B. P. Nash
Affiliation:
Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
S. J. Mills
Affiliation:
Geosciences, Museum Victoria, GPO Box 666, Melbourne 3001, Victoria, Australia
*

Abstract

A comparative study is presented of the chemistry and crystallography of zinc-bearing strunzites from Hagendorf Süd, Bavaria, Germany and the Sitio do Castelo mine, Folgosinho, Portugal. Electron microprobe analyses of samples from the two localities show quite different cation substitutions. The Hagendorf Süd mineral is a Zn-bearing ferristrunzite, with compositional zoning due to Zn2+ replacing predominantly Fe3+ as well as minor Mn2+, whereas the Portugese mineral is a Zn-bearing strunzite, in which Zn2+ replaces Mn2+, with minor replacement of Fe3+ by Mn3+. Zincostrunzite, with dominant Zn in the interlayer octahedrally coordinated site, is a new strunzite-group mineral that has been characterized at both locations. Analysis of single-crystal synchrotron data for zinc-bearing ferristrunzite and zincostrunzite crystals from Hagendorf Süd show that the structures of both minerals contain zeolitic water in the interlayer region. The formula for strunzite-group minerals containing the zeolitic water is MFe23+(PO4)2(OH)2·6.5H2O, M=Fe, Mn, Zn. This formulation agrees with that found for zincostrunzite from the Sitio do Castelo mine, but differs from that reported previously for strunzite, MFe2+(PO4)2(OH)2·6H2O, which has no interlayer water. Interestingly, the zincostrunzites from the two localities differ in the location of the interlayer water molecule, with a corresponding difference in the H bonding.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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