Startseite High-temperature Raman spectroscopy of K2Ca(CO3)2 bütschliite and Na2Ca2(CO3)3 shortite
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High-temperature Raman spectroscopy of K2Ca(CO3)2 bütschliite and Na2Ca2(CO3)3 shortite

  • Garrett Zeff ORCID logo EMAIL logo und Quentin Williams
Veröffentlicht/Copyright: 14. August 2025
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 110 Heft 8

Abstract

Raman spectra of Na2Ca2(CO3)3 shortite and K2Ca(CO3)2 bütschliite were measured to 715 and 740 °C, respectively, under vacuum. The vibrational spectra demonstrate that shortite converts to nyerereite [Na2Ca(CO3)2] and calcite at 535 °C. This assemblage remains stable up to ∼700 °C, at which point nyerereite begins to decompose. Bütschliite converts to the isochemical phase fairchildite at 570 °C, which is stable to 665 °C, where it decomposes to an assemblage of K2CO3 and CaO. The variation of anharmonicity between different vibrational modes of each of the low-temperature phases is assessed, and these yield insights into inter-carbonate group couplings. Both fairchildite and nyerereite exhibit spectral features consistent with extensive disordering.

Keywords: Carbonate; high-temperature; Raman spectroscopy; carbonatite

Acknowledgments and Funding

This work was supported by the U.S. National Science Foundation through award EAR-2017294. This research was partially supported by SEES, Synchrotron Earth and Environmental Science, under NSF Cooperative Agreement EAR 2223273. We thank an anonymous reviewer and Monika Koch-Müller for helpful comments on the manuscript.

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Received: 2024-06-16
Accepted: 2024-11-27
Published Online: 2025-08-14
Published in Print: 2025-08-26

© 2025 Mineralogical Society of America

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https://doi.org/10.2138/am-2024-9500
Schlagwörter für diesen Artikel
Carbonate; high-temperature; Raman spectroscopy; carbonatite

Artikel in diesem Heft

  1. Hematite (U-Th)/He thermochronometry unveils unique exhumation history: An example from the Dexing porphyry copper deposit, Southern China
  2. Viscosity measurements of selected lunar regolith simulants
  3. Formation of nano-CdS solid solution: A mechanism for Cd enrichment in sphalerite
  4. Identification of the nature of recycled carbonates in the mantle: Insights from the Mo-Mg isotopic pair
  5. Discriminating ionic mobility between diffusivity and electrical conductivity experiments on Earth’s silicate materials
  6. Morphological approach to understanding mineral alteration and nanoparticle formation under alkaline conditions using granitic rock thin sections
  7. Identification of hydroandradite in CM carbonaceous chondrites: Aproduct of calc-silicate alteration on C-complex asteroids
  8. Growth and crystallographic features of interpenetrant twins in natural diamonds
  9. Determination of the oxidation state of iron in calcic pyroxene using the electron microprobe flank method
  10. Formation mechanism of boehmite and diaspore in karstic bauxites: Trace element geochemistry in source materials using a large sample geochemical dataset and a random forest model
  11. High-temperature Raman spectroscopy of K2Ca(CO3)2 bütschliite and Na2Ca2(CO3)3 shortite
  12. Effects of high-temperature annealing and low-temperature metamictization on Archean zircon: Constraints from U-Pb isotopes, trace elements, and Raman dating
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