Startseite Polarized FTIR spectroscopic examination on hydroxylation in the minerals of the wolframite group, (Fe,Mn,Mg)[W,(Nb,Ta)][O,(OH)]4
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Polarized FTIR spectroscopic examination on hydroxylation in the minerals of the wolframite group, (Fe,Mn,Mg)[W,(Nb,Ta)][O,(OH)]4

  • Dominik Talla EMAIL logo , Anton Beran , Radek Škoda und Zdeněk Losos
Veröffentlicht/Copyright: 3. April 2017
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 102 Heft 4

Abstract

Polarized FTIR spectroscopic measurements of 11 natural wolframite single crystals from different occurrences revealed the common presence of structurally bound OH groups in their crystal lattice, with potential influence on the properties of thisse geologically and technologically important group of compounds. Despite differences in the appearance of the OH absorption pattern, dependent among other on the end-member ratio, two types of “intrinsic” OH defects could be discerned from detailed studies of the pleochroic behavior of the absorption bands both at 80 K and room temperature. The accompanying chemical analyses by the electron microprobe helped to clearly identify the substitution trend W6+ + O2– ↔ (Nb,Ta)5+ + OH– as the prevailing hydrogen incorporation mechanism into wolframite. The assignment of the observed IR absorption phenomena to hydrous defects was confirmed by the results of deuteration experiments and the negligible contribution of included impurities to the FTIR spectra in the OH absorption region. The results obtained in this study of natural wolframite crystals can be used to detect and analyze hydrous defects in synthetic technologically important tungstates.

Keywords: Wolframite; FTIR spectroscopy; OH defects; nominally anhydrous minerals; deuteration; flux synthesis

Acknowledgments

Mg-enriched wolframite samples CET and OLH from Czech metagreisens were kindly provided to us by L. Losertova. Sample 12767 was obtained from the mineral collection of the Institut für Mineralogie und Kristallographie, Universität Wien, all other samples from the mineral collection of the Department of Geological Sciences, Masaryk University. We are indebted to G. Giester for the initial orientation of the wolframite crystals and A. Wagner for subsequent careful sample preparation. We thank B. Mihailova, H. Skogby and an anonymous reviewer for their helpful comments, which enabled us to significantly improve the quality of this paper.

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Received: 2015-12-24
Accepted: 2016-11-17
Published Online: 2017-4-3
Published in Print: 2017-4-1

© 2017 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2017-5664
Schlagwörter für diesen Artikel
Wolframite; FTIR spectroscopy; OH defects; nominally anhydrous minerals; deuteration; flux synthesis

Artikel in diesem Heft

  1. Review: Minerals in the Human Body
  2. Mineral precipitation and dissolution in the kidney
  3. Special Collection: Nanominerals and Mineral Nanoparticles
  4. Luogufengite: A new nano-mineral of Fe2O3 polymorph with giant coercive field
  5. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  6. Column anion arrangements in chemically zoned ternary chlorapatite and fluorapatite from Kurokura, Japan
  7. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  8. Magmatic graphite inclusions in Mn-Fe-rich fluorapatite of perphosphorus granites (the Belvís pluton, Variscan Iberian Belt)
  9. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  10. Barometric constraints based on apatite inclusions in garnet
  11. Special collection: Olivine
  12. A comparison of olivine-melt thermometers based on DMg and DNi: The effects of melt composition, temperature, and pressure with applications to MORBs and hydrous arc basalts
  13. Special collection: Dynamics of magmatic processes
  14. Water transfer during magma mixing events: Insights into crystal mush rejuvenation and melt extraction processes
  15. Special collection: Rates and depths of magma ascent on earth
  16. A new clinopyroxene-liquid barometer, and implications for magma storage pressures under Icelandic rift zones
  18. The S content of silicate melts at sulfide saturation: New experiments and a model incorporating the effects of sulfide composition
  20. Bond valence and bond energy
  22. Fluvial transport of impact evidence from cratonic interior to passive margin: Vredefort-derived shocked zircon on the Atlantic coast of South Africa
  24. Iron partitioning in natural lower-mantle minerals: Toward a chemically heterogeneous lower mantle
  26. Identifying biogenic silica: Mudrock micro-fabric explored through charge contrast imaging
  28. Compressibility and high-pressure structural behavior of Mg2Fe2O5
  30. Thermo-elastic behavior of grossular garnet at high pressures and temperatures
  32. Experimental constraints on the stability of baddeleyite and zircon in carbonate- and silicate-carbonate melts
  34. Polarized FTIR spectroscopic examination on hydroxylation in the minerals of the wolframite group, (Fe,Mn,Mg)[W,(Nb,Ta)][O,(OH)]4
  36. Tourmaline-rich features in the Heemskirk and Pieman Heads granites from western Tasmania, Australia: Characteristics, origins, and implications for tin mineralization
  38. Ca L2,3-edge near edge X-ray absorption fine structure of tricalcium aluminate, gypsum, and calcium (sulfo)aluminate hydrates
  40. Fluorwavellite, Al3(PO4)2(OH)2F·5H2O, the fluorine analog of wavellite
  42. New Mineral Names
  43. Book Review
  44. Book Review: Geochemical Rate Models: An Introduction to Geochemical Kinetics
  45. Book Review
  46. Book Review: Oxygen: A Four Billion Year History
  47. Erratum
  48. Calibration of Fe XANES for high-precision determination of Fe oxidation state in glasses: Comparison of new and existing results obtained at different synchrotron radiation sources
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