Articles | Volume 37, issue 4
https://doi.org/10.5194/ejm-37-535-2025
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the Creative Commons Attribution 4.0 License.
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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.
Research article
| 
01 Aug 2025
Research article |
| 01 Aug 2025
| 01 Aug 2025
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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Silvia Fornasaro, Paola Comodi, Laura Crispini, Sandro Zappatore, Azzurra Zucchini, and Pietro Marescotti
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Elba tourmaline crystals commonly display a sharp transition to dark colors at the analogous termination, but the mechanisms leading to the formation of such terminations are unclear. Here we propose a general genetic model in which, as a consequence of a pocket rupture event, chemical alteration of early formed Fe-/Mn-rich minerals in the enclosing pegmatite was responsible for the release of Fe and/or Mn in the geochemical system, allowing the formation of the late-stage dark terminations.
Nadia Curetti and Alessandro Pavese
Eur. J. Mineral., 35, 373–382, https://doi.org/10.5194/ejm-35-373-2023, https://doi.org/10.5194/ejm-35-373-2023, 2023
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Paramontroseite is a V dioxide (a = 4.8960(14) Å, b = 9.395(3) Å, c = 2.9163(5) Å, V = 134.14(6) Å3; space group Pbnm). The sample under investigation (Prachovice mine, Czech Republic) bears 20 wt % of Fe2O3, and the Fe atoms occupy tetrahedral sites arranged in the
emptychannel along z. Thermal expansion is anisotropic. At T > 350 °C, paramontroseite decomposes and two new phases form: V2O5 (V-pentoxide) and V4Fe2O13 (Fe-tetrapolyvanadate).
Lara Sulcek, Bernd Marler, and Michael Fechtelkord
Eur. J. Mineral., 35, 199–217, https://doi.org/10.5194/ejm-35-199-2023, https://doi.org/10.5194/ejm-35-199-2023, 2023
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Synthetic lepidolites and Li-muscovites were characterised by nuclear magnetic resonance (NMR) spectroscopy and X-ray diffraction. Both Li and F / OH content influence the occurrence of the impurity phases. A solid solution series exists for lepidolites with polylithionite and trilithionite as endmembers but does not between trilithionite and muscovite. NMR investigations indicate there is a preference for incorporating fluorine and OH groups near Li-rich and Al-rich environments, respectively.
Natalia Dubrovinskaia, Maria Messingschlager, and Leonid Dubrovinsky
Eur. J. Mineral., 34, 563–572, https://doi.org/10.5194/ejm-34-563-2022, https://doi.org/10.5194/ejm-34-563-2022, 2022
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In this work we report a new locality for the rare mineral hydroromarchite, Sn3O2(OH)2. It was found not in a submarine environment but in soil at the Saint James Church archaeological site in Creussen, Germany. A tin artefact (a tin button) was exposed to weathering in soil for about 300 years. We solved and refined its structure based on single-crystal X-ray diffraction analysis.
Erich Keck, Ian E. Grey, Colin M. MacRae, Stephanie Boer, Rupert Hochleitner, Christian Rewitzer, William G. Mumme, A. Matt Glenn, and Cameron Davidson
Eur. J. Mineral., 34, 439–450, https://doi.org/10.5194/ejm-34-439-2022, https://doi.org/10.5194/ejm-34-439-2022, 2022
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First occurrences of the secondary phosphate minerals kenngottite, Mn32+Fe43+(PO4)4(OH)6(H2O)2; allanpringite, Fe33+(PO4)2(OH)3·5H2O; iangreyite, Ca2Al7(PO4)2(PO3OH)2(OH,F)15·8H2O; and nizamoffite, MnZn2(PO4)2(H2O)4, from the Hagendorf Süd pegmatite are reported, with characterisation of their crystal chemistry and phase associations.
Herbert Kroll, Hans Ulrich Bambauer, and Horst Pentinghaus
Eur. J. Mineral., 32, 427–441, https://doi.org/10.5194/ejm-32-427-2020, https://doi.org/10.5194/ejm-32-427-2020, 2020
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Feldspars constitute about 60 % of the earth's crust. Na-feldspar, Na[AlSi3O8], is central to this mineral group. Its structural response to changing conditions of temperature and pressure is complicated. In particular, this applies to the distribution of Al and Si on the atomic sites of its crystal structure. We clarify how this distribution varies in thermodynamic equilibrium with external conditions and provide procedures that allow easy determination of the atomic distribution.
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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...
