European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 37, issue 4
Articles | Volume 37, issue 4
https://doi.org/10.5194/ejm-37-535-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/ejm-37-535-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 37, issue 4
Research article
 | 
01 Aug 2025
Research article |  | 01 Aug 2025

The oxidation of Fe in riebeckite at 0.7 GPa

Giancarlo Della Ventura, Roberta Oberti, Valeria Misiti, Francesco Radica, Gunther J. Redhammer, Simone Bernardini, Massimo Boiocchi, and Boriana Mihailova

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Short summary
The thermal reaction Fe2+ + OH- → Fe3+ + O2- + e- + H+ in hydrous silicates has tremendous implications in planetary-scale phenomena like electrical anomalies, water cycling, seismicity, volcanism, and ore generation. We annealed riebeckite crystals up to 750 °C and P = 0.7 GPa and show that the amphibole stability is extended without any Fe oxidation, implying that thermally activated electron hopping contributes to the electrical conductivity of lithospheric rocks during subduction.
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