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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


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1945-3027
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Volume 97, Issue 10

Issues

Crystal structure of pseudojohannite, with a revised formula, Cu3(OH)2[(UO2)4O4(SO4)2](H2O)12

Jakub Plášil
  • Corresponding author
  • Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, CZ-611 37, Brno, Czech Republic
  • Institute of Physics ASCR, v.v.i., Na Slovance 2, CZ-182 21 Prague, Czech Republic
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/ Karla Fejfarová / Kia Sheree Wallwork / Michal Dušek / Radek Š Škoda
  • Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, CZ-611 37, Brno, Czech Republic
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/ Jiří Sejkora
  • Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, CZ-193 00, Prague 9, Czech Republic
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/ Jiří Č Čejka
  • Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, CZ-193 00, Prague 9, Czech Republic
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/ František Veselovský / Jan Hloušek / Nicolas Meisser
  • Musée de Géologie and Laboratoire des Rayons-X, Institut de Minéralogie et de Géochimie, UNIL, Anthropole, CH-1015 Lausanne-Dorigny, Switzerland
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/ Joël Brugger
  • South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia
  • TRaX, School of Earth and Environmental Sciences, University of Adelaide, 5005 Adelaide, Australia
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Published Online: 2015-04-02 | DOI: https://doi.org/10.2138/am.2012.4127

Abstract

The crystal structure of pseudojohannite from White Canyon, Utah, was solved by charge-flipping from single-crystal X-ray diffraction data and refined to an Robs = 0.0347, based on 2664 observed reflections. Pseudojohannite from White Canyon is triclinic, P1̄, with a = 8.6744(4), b = 8.8692(4), c = 10.0090(5) Å, α = 72.105(4)°, β = 70.544(4)°, γ = 76.035(4)°, and V = 682.61(5) Å3, with Z = 1 and chemical formula Cu3(OH)2[(UO2)4O4(SO4)2](H2O)12. The crystal structure of pseudojohannite is built up from sheets of zippeite topology that do not contain any OH groups; these sheets are identical to those found in zippeites containing Mg2+, Co2+, and Zn2+. The two Cu2+ sites in pseudojohannite are [5]- and [6]-coordinated by H2O molecules and OH groups. The crystal structure of the pseudojohannite holotype specimen from Jáchymov was refined using Rietveld refinement of high-resolution powder diffraction data. Results indicate that the crystal structures of pseudojohannite from White Canyon and Jáchymov are identical.

Keywords : Pseudojohannite; zippeite group; uranyl sulfate; X-ray diffraction; crystal structure; chemical composition

About the article

Received: 2012-02-08

Accepted: 2012-06-11

Published Online: 2015-04-02

Published in Print: 2012-10-01


Citation Information: American Mineralogist, Volume 97, Issue 10, Pages 1796–1803, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2012.4127.

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