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.
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.
the Creative Commons Attribution 4.0 License.
The oxidation of Fe in riebeckite at 0.7 GPa
Giancarlo Della Ventura
CORRESPONDING AUTHOR
Department of Sciences, University of Roma Tre, Rome, Italy
INFN-LNF, Via E. Fermi 40, Frascati, 00044 Rome, Italy
INGV, Via di Vigna Murata 605, 00143 Rome, Italy
Roberta Oberti
CNR-Istituto di Geoscienze e Georisorse, Pavia, Italy
Valeria Misiti
INGV, Via di Vigna Murata 605, 00143 Rome, Italy
Francesco Radica
INGEO Department, University of Chieti-Pescara “G. d'Annunzio”, Chieti, Italy
Gunther J. Redhammer
Department of Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringerstr. 2A, 5020 Salzburg, Austria
Simone Bernardini
Department of Sciences, University of Roma Tre, Rome, Italy
Massimo Boiocchi
Centro Grandi Strumenti, Università di Pavia, via Bassi 21, 27100 Pavia, Italy
Boriana Mihailova
Fachbereich Geowissenschaften, Universität Hamburg, Hamburg, Germany
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Christian Reinberg, Stylianos Aspiotis, Thomas Malcherek, Stefan T. M. Peters, and Boriana Mihailova
Eur. J. Mineral., 38, 461–475, https://doi.org/10.5194/ejm-38-461-2026, https://doi.org/10.5194/ejm-38-461-2026, 2026
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By applying in situ high-temperature Raman spectroscopy to (OH)-- and Fe2+-bearing fluorophlogopite we show that a phonon-driven structural instability near 600 K triggers the mobilization of interlayer K+ cations, which can act as charge carriers. Above 1100 K all H+ cations delocalize and can also contribute to transport processes. Above 1300 K oxidation of Fe takes place, along with limited dehydrogenation and dehydroxylation, facilitating partial K+ leakage and structural decomposition.
Thomas Malcherek, Boriana Mihailova, Jochen Schlüter, Philippe Roth, and Nicolas Meisser
Eur. J. Mineral., 36, 153–164, https://doi.org/10.5194/ejm-36-153-2024, https://doi.org/10.5194/ejm-36-153-2024, 2024
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The new mineral heimite was originally discovered on the mine dumps of the Grosses Chalttal deposit, Mürtschenalp district, Glarus, Switzerland. Its relatively simple chemistry is formed by water and ions of lead, copper, arsenic, hydrogen and oxygen. The mineral's crystal structure is related to the well-known duftite, which is also observed to grow on crystals of heimite. While heimite has so far only been found in the central Alps, it is expected to occur in other copper deposits worldwide.
Mariko Nagashima and Boriana Mihailova
Eur. J. Mineral., 35, 267–283, https://doi.org/10.5194/ejm-35-267-2023, https://doi.org/10.5194/ejm-35-267-2023, 2023
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We provide a tool for fast preparation-free estimation of the Fe3+ content in Al–Fe3+ series epidotes by Raman spectroscopy. The peaks near 570, 600, and 1090 cm−1, originating from Si2O7 vibrations, strongly correlated with Fe content, and all three signals are well resolved in a random orientation. Among them, the 570 cm−1 peak is the sharpest and easily recognized. Hence, the linear trend, ω570 = 577.1(3) − 12.7(4)x, gives highly reliable Fe content, x, with accuracy ± 0.04 Fe3+ apfu.
Stylianos Aspiotis, Jochen Schlüter, Günther J. Redhammer, and Boriana Mihailova
Eur. J. Mineral., 34, 573–590, https://doi.org/10.5194/ejm-34-573-2022, https://doi.org/10.5194/ejm-34-573-2022, 2022
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Combined Raman-scattering and wavelength-dispersive electron microprobe (WD-EMP) analyses of natural biotites expanding over the whole biotite solid-solution series demonstrate that the chemical composition of the MO6 octahedra, TO4 tetrahedra, and interlayer space can be non-destructively determined by Raman spectroscopy with relative uncertainties below 8 %. The content of critical minor elements such as Ti at the octahedral site can be quantified as well with a relative error of ~ 20 %.
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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.
The thermal reaction Fe2+ + OH- → Fe3+ + O2- + e- + H+ in hydrous silicates has tremendous...