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Structural and compositional variations of basic Cu(II) chlorides in the herbertsmithite and gillardite structure field

Published online by Cambridge University Press:  02 January 2018

Matthew J. Sciberras,
Peter Leverett,
Peter A. Williams,
Jochen Schlüter,
Thomas Malcherek,
Mark D. Welch,
Peter J. Downes,
David E. Hibbs and
Anthony R. Kampf
Matthew J. Sciberras*
Affiliation:
School of Science and Health, Western Sydney University, Locked Bag 1797, Penrith NSW 2751, Australia
Peter Leverett
Affiliation:
School of Science and Health, Western Sydney University, Locked Bag 1797, Penrith NSW 2751, Australia
Peter A. Williams
Affiliation:
School of Science and Health, Western Sydney University, Locked Bag 1797, Penrith NSW 2751, Australia
Jochen Schlüter
Affiliation:
Mineralogisch-Petrographisches Institut, Universität Hamburg, Grindelallee 48, D-20146 Hamburg, Germany
Thomas Malcherek
Affiliation:
Mineralogisch-Petrographisches Institut, Universität Hamburg, Grindelallee 48, D-20146 Hamburg, Germany
Mark D. Welch
Affiliation:
Mineral and Planetary Sciences Division, Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK
Peter J. Downes
Affiliation:
Western Australian Museum, Locked Bag 49, Welshpool DC, Western Australia 6986, Australia
David E. Hibbs
Affiliation:
Faculty of Pharmacy, University of Sydney, NSW 2006, Australia
Anthony R. Kampf
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA
*
*E-mail: matthew.sciberras@gmail.com
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Abstract

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Natural samples of the substituted basic Cu(II) chloride series, Cu4–xM x 2+(OH)6Cl2(M = Zn, Ni, or Mg) were investigated by single-crystal X-ray diffraction in order to elucidate compositional boundaries associated with paratacamite and its congeners. The compositional ranges examined are Cu3.65Zn0.35(OH)6Cl2 – Cu3.36Zn0.64(OH)6Cl2 and Cu3.61Ni0.39(OH)6Cl2 – Cu3.13Ni0.87(OH)6Cl2, along with a single Mg-bearing phase. The majority of samples studied have trigonal symmetry (R3̄m) analogous to that of herbertsmithite (Zn) and gillardite (Ni), with a ≈ 6.8, c ≈ 14.0 Å. Crystallographic variations for these samples caused by composition are compared with both published and new data for the R3̄m sub-cell of paratacamite, paratacamite-(Mg) and paratacamite-(Ni). The observed trends suggest that the composition of end-members associated with the paratacamite congeners depend upon the nature of the substituting cation.

Keywords

paratacamiteparatacamite-(Mg)paratacamite-(Ni)herbertsmithitegillarditecompositionalboundarycrystal structure

Information

Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 1 , February 2017, pp. 123 - 134
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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