Mineralogy and Petrology

, Volume 107, Issue 2, pp 221–233 | Cite as

A contribution to the crystal chemistry of the voltaite group: solid solutions, Mössbauer and infrared spectra, and anomalous anisotropy

  • Juraj Majzlan
  • Hannes Schlicht
  • Maria Wierzbicka-Wieczorek
  • Gerald Giester
  • Herbert Pöllmann
  • Beatrix Brömme
  • Stephen Doyle
  • Gernot Buth
  • Christian Bender Koch
Original Paper

Abstract

Voltaite is a mineral of fumaroles, solfatares, coal-fire gas vents, and acid-mine drainage systems. The nominal composition is K2Fe52+Fe33+Al(SO4)12·18H2O and the nominal symmetry is cubic, \(Fd\overline{3}c\). The tetragonal (I41/acd) superstructure of voltaite is known as the mineral pertlikite. In this study, we investigated 22 synthetic voltaite samples in which Fe2+ was partially or completely replaced by Mg, Zn, Mn, or Cd, by single-crystal and powder X-ray diffraction (both in-house and synchrotron). Two samples contained NH4+ instead of K+. The structure of voltaite is based on a framework defined by kröhnkite-like heteropolyhedral chains which host both M3+ and M2+ in octahedral coordination. Unit cell dimensions of the end-members scale almost linearly with the size of M2+. In the Fe2+-Mg-Zn solid solutions, the Fe2+-Mg and Fe2+-Zn solutions are linear (ideal) in terms of their lattice-parameter variations. The Mg-Zn solid solution, however, is strongly non-ideal. A detailed analysis of the topology of the chains showed that this behavior originates in expansion and contraction of individual M2+-O bonds within the chains. In the Mg-Zn solid solution, some of the M2+-O bonds expand while none contract. In the other solid solutions, expansion of some M2+-O bonds is always compensated by contraction of the other ones. Parts of the nominally cubic crystals are optically anisotropic and their symmetry is found to be tetragonal by single crystal X-ray diffraction measurements. The coexistence of cubic and tetragonal sectors within a single crystal without any detectable difference in their chemical composition is difficult to explain in terms of growth of such composite crystals. Mössbauer and infrared spectra collected on our synthetic crystals conform with previously published data.

Notes

Acknowledgments

We are grateful to two anonymous reviewers for their constructive criticism. We thank D. Merten (Institute of Geosciences, Friedrich-Schiller-Universität Jena) for the ICP-OES analyses, H. Görls (Institute for Inorganic and Analytical Chemistry, Friedrich-Schiller-Universität Jena) for the single-crystal XRD data, G. Sentis (Institute of Pharmacy, Friedrich-Schiller-Universität Jena) for the infrared spectra, and B. Kreher-Hartmann (Institute of Geosciences, Friedrich-Schiller-Universität Jena) for the macrophotographs of the voltaite crystals. We acknowledge the ANKA Angströmquelle Karlsruhe for the provision of the beamtime at the PDIFF and SCD beamlines.

Supplementary material

710_2012_254_MOESM1_ESM.doc (658 kb)
ESM 1(DOC 658 kb)

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Copyright information

© Springer-Verlag Wien 2012

Authors and Affiliations

  • Juraj Majzlan
    • 1
  • Hannes Schlicht
    • 1
  • Maria Wierzbicka-Wieczorek
    • 1
  • Gerald Giester
    • 2
  • Herbert Pöllmann
    • 3
  • Beatrix Brömme
    • 3
  • Stephen Doyle
    • 4
  • Gernot Buth
    • 4
  • Christian Bender Koch
    • 5
  1. 1.Institute of GeosciencesFriedrich-Schiller-Universität JenaJenaGermany
  2. 2.Institute of Mineralogy and Crystallography, Faculty of Geosciences, Geography and AstronomyUniversity of ViennaViennaAustria
  3. 3.Institute of GeosciencesMartin-Luther-Universität Halle-WittenbergHalleGermany
  4. 4.ANKAKarlsruhe Institute of TechnologyEggenstein-LeopoldshafenGermany
  5. 5.Department of ChemistryUniversity of CopenhagenCopenhagenDenmark

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