European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 37, issue 1
Articles | Volume 37, issue 1
https://doi.org/10.5194/ejm-37-13-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/ejm-37-13-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 37, issue 1
Research article
 | 
08 Jan 2025
Research article |  | 08 Jan 2025

Crystal structure and elastic properties of parabreyite: a new high-pressure ring silicate in the CaSiO3 system

Benedetta Chrappan Soldavini, Marco Merlini, Mauro Gemmi, Paola Parlanti, Patrizia Fumagalli, Sula Milani, Boby Joseph, Giorgio Bais, Maurizio Polentarutti, Alexander Kurnosov, and Stefano Poli

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Short summary
The CaSiO3 system exhibits structural complexity with various polymorphs under different pressure and temperature conditions. This study stabilizes a new high-pressure polymorph, parabreyite, via multianvil syntheses at 4–5 GPa and 600–800 °C. Parabreyite's triclinic structure, with distinct threefold tetrahedral rings, was solved using 3D electron diffraction and X-ray diffraction. Elastic properties, thermal expansion and Raman spectra differences with breyite were analyzed.
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