Physics and Chemistry of Minerals

, Volume 41, Issue 8, pp 617–631 | Cite as

Static elasticity of cordierite II: effect of molecular CO2 channel constituents on the compressibility

  • K. S. ScheidlEmail author
  • G. D. Gatta
  • T. Pippinger
  • B. Schuster
  • C. Trautmann
  • R. Miletich
Original Paper


Two natural CO2-rich cordierite samples (1.00 wt% CO2, 0.38 wt% H2O, and 1.65 wt% CO2, 0.15 wt% H2O, respectively) were investigated by means of Raman spectroscopy and single-crystal X-ray diffraction at ambient and high pressures. The effect of heavy-ion irradiation (Au 2.2 GeV, fluence of 1 × 1012 ions cm−2) on the crystal structure was investigated to characterize the structural alterations complementary to results reported on hydrous cordierite. The linear CO2 molecules sustained irradiation-induced breakdown with small CO2-to-CO conversion rates in contrast to the distinct loss of channel H2O. The maximum CO2 depletion rate corresponds to ~12 ± 5 % (i.e. ~0.87 and ~1.49 wt% CO2 according to the two samples, respectively). The elastic properties of CO2-rich cordierite reveal stiffening due to the CO2 molecules (non-irradiated: isothermal bulk modulus K 0 = 120.3 ± 3.7 GPa, irradiated: K 0 = 109.7 ± 3.7 GPa), but show the equivalent effect of hydrous cordierite to get softer when irradiated. The degree of anisotropy of axial compressibilities and the anomalous elastic softening at increasing pressure agrees with those reported for hydrous cordierite. Nevertheless, the experimental high-pressure measurements using ethanol–methanol reveal a small hysteresis between compression and decompression, together with the noticeable effect of pressure-induced over-hydration at pressures between 4 and 5 GPa.


Cordierite Molecular CO2 Heavy-ion irradiation Equation-of-state Comparative static compressibility Pressure-induced over-hydration 



We thank Thomas Armbruster (Bern), Thomas Malcherek (Hamburg), and Carl. A. Francis (Harvard Mineralogical Museum) for providing us with the CO2-rich cordierite sample material, Andreas Wagner for the careful preparation of crystal thin sections, Ilse Glass for performing EDX analyses, and Eva-Maria Zeiringer for measurements of individual data points on sample cn. Financial support through start-up funding of the University of Vienna (Grant BE532003) is gratefully acknowledged. Finally we thank the two reviewers for their valuable suggestions and great effort, which significantly improved the manuscript.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • K. S. Scheidl
    • 1
    Email author
  • G. D. Gatta
    • 2
  • T. Pippinger
    • 1
  • B. Schuster
    • 3
    • 4
    • 5
    • 6
  • C. Trautmann
    • 3
    • 4
  • R. Miletich
    • 1
  1. 1.Institut für Mineralogie und KristallographieUniversität WienViennaAustria
  2. 2.Dipartimento di Scienze della TerraUniversitá degli Studi di MilanoMilanItaly
  3. 3.GSI Helmholtzzentrum für SchwerionenforschungDarmstadtGermany
  4. 4.Material- und GeowissenschaftenTechnische Universität DarmstadtDarmstadtGermany
  5. 5.Institut für FestkörperphysikTechnische Universität DarmstadtDarmstadtGermany
  6. 6.Areva GmbHErlangenGermany

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