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Zeitschrift für Kristallographie - Crystalline Materials

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Ed. by Antipov, Evgeny / Boldyreva, Elena V. / Friese, Karen / Huppertz, Hubert / Jahn, Sandro / Tiekink, E. R. T.


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Volume 233, Issue 7

Issues

Mn-bearing eleonorite from Hagendorf South pegmatite, Germany: crystal structure and crystal-chemical relationships with other beraunite-type phosphates

Sergey M. Aksenov
  • Corresponding author
  • Vernadsky Institute, Russian Academy of Sciences, Kosygin Str., 19, Moscow 119991, Russia
  • Institute of Crystallography and Photonics, Russian Academy of Sciences, Leninskii Pr., 59, Moscow 119333, Russia
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/ Nikita V. Chukanov
  • Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia
  • Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow 119991, Russia
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/ Jörg Göttlicher
  • Karlsruhe Institute of Technology, Institute for Photon Science and Synchrotron Radiation (IPS), Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany
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/ Rupert Hochleitner
  • Museum Reich der Kristalle, Mineralogische Staatssammlung München, Theresien Str. 41, D-80333 München, Germany
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/ Ekaterina S. Zarubina
  • Institute of Crystallography and Photonics, Russian Academy of Sciences, Leninskii Pr., 59, Moscow 119333, Russia
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/ Ramiza K. Rastsvetaeva
  • Institute of Crystallography and Photonics, Russian Academy of Sciences, Leninskii Pr., 59, Moscow 119333, Russia
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Published Online: 2018-06-13 | DOI: https://doi.org/10.1515/zkri-2017-2099

Abstract

Mn2+-bearing eleonorite from the Hagendorf South pegmatite situated south of Waidhaus, Upper Palatinate, Bavaria, Germany was study based on single crystal X-ray analysis, Mn and Fe K-edge XANES spectroscopy, as well as IR spectroscopy. According to spectroscopic data, all Mn is bivalent, and all Fe is trivalent. The empirical formula of the mineral is (Mn2+0.58Zn0.13Mg0.04 Fe3+5.24)Σ5.98(PO4)4(H2O,OH,O)11. The monoclinic unit-cell parameters are: a=20.832(3) Å, b=5.1569(3) Å, c=19.200(2) Å, β=93.01(1)°; space group C2/c. The structure was refined to R1=5.20% in anisotropic approximation using 1994 reflections with I>3σ(I). Despite in most beraunite-group minerals M1-site demonstrates selective accumulation of bivalent cations, in Mn-bearing eleonorite Mn2+-cations are disordered between octahedral sites without statistical predominance anywhere; all octahedral M(1–4)-sites are predominantly occupied by Fe3+. M1-site is half-occupied by Fe3+ and contains subordinate Mn2+ and minor Zn2+ and Mg2+. Based on the new data we suppose that Mn-bearing eleonorite was formed as a secondary phase as a result of oxidation of a primary Mn-bearing beraunite-group mineral in with Mn2+ was initially distributed between different M sites.

This article offers supplementary material which is provided at the end of the article.

Keywords: beraunite-group minerals; cation arrangement; IR spectroscopy; Mn-bearing eleonorite; octahedral clusters; single crystal X-ray analysis; XANES spectroscopy

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About the article

Received: 2017-09-06

Accepted: 2018-01-15

Published Online: 2018-06-13

Published in Print: 2018-07-26


Citation Information: Zeitschrift für Kristallographie - Crystalline Materials, Volume 233, Issue 7, Pages 469–477, ISSN (Online) 2196-7105, ISSN (Print) 2194-4946, DOI: https://doi.org/10.1515/zkri-2017-2099.

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