Physics and Chemistry of Minerals

, Volume 32, Issue 10, pp 733–746 | Cite as

Crystal chemistry and OH defect concentrations in spodumene from different granitic pegmatites

  • J. FilipEmail author
  • M. Novák
  • A. Beran
  • R. Zbořil
Original Paper


Thirty spodumene samples of distinct paragenetic types (primary magmatic, secondary after petalite and hydrothermal) from variety of granitic pegmatites were characterized by electron microprobe, polarized FTIR spectroscopy and Mössbauer spectroscopy. The FTIR spectra of OH (weak sharp pleochroic bands at 3,425, 3,410, 3,395 cm−1 and in the 3,500–3,470 spectral region) are strongly polarized with maximum absorption parallel to nγ. The majority of OH dipoles are presumably generated by a partial replacement of O2 oxygen atoms with an orientation pointing above the Li vacancy site. The separation of the bands probably resulted from a replacement of the coordinating Al by Fe and Si by Al. Homogeneous spodumene mostly close to its ideal formula LiAlSi2O6 shows Fe (0.00–0.10 apfu as Fe3+; Fe3+ >> Fe2+) and Na (0.00–0.04 apfu) as the only minor cations and Fe3+Al−1 substitution up to 10 mol% of the LiFe3+Si2O6 component. Hydrogen concentrations (from 0.1 up to <5 ppm H2O by weight) vary as a function of genetic type with the highest amounts in high-temperature magmatic spodumene. Differences among particular genetic types of spodumene are related to maximum solubility of OH in spodumene structure at given PT conditions and at actual chemical composition of spodumene. OH defect concentrations in spodumene follow a trend, LT/LP pyroxenes containing lower hydrogen contents compared to HT/HP ones. The hydrogen contents in particular genetic types of spodumene and their decrease with decreasing T and P are consistent with petrologic models of the pegmatite (sub)types formations.


Spodumene EMP FTIR OH defect Granitic pegmatites 



This work has been supported by a Marie Curie Fellowship of the European Commission under contract number HPMT-CT-2000-00138 to JF and by research projects of Ministry of Education of Czech Republic (MSM0021622412 to MN and MSM6198959218 to RZ). Major part of this work has been done during stay of JF at the University of Vienna. We wish to thank A. Wagner for his delicate sample preparation, U. Kolitsch, A. Wieczorek, J. Leichmann, R. Škoda and M. Mashlan for technical assistance. Samples for this study were kindly provided by the Moravian Museum in Brno, Czech Republic, E. Libowitzky and M. Bohatý.


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Institute of Geological SciencesMasaryk University in BrnoBrnoCzech Republic
  2. 2.Centre for Nanomaterial Research and Department of Physical ChemistryPalacky University in OlomoucOlomoucCzech Republic
  3. 3.Department for Mineralogy and Crystallography University of Vienna—GeocentreWienAustria

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