Articles | Volume 33, issue 6
https://doi.org/10.5194/ejm-33-743-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-33-743-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Vibrational spectroscopic study of three Mg–Ni mineral series in white and greenish clay infillings of the New Caledonian Ni-silicate ores
Emmanuel Fritsch
CORRESPONDING AUTHOR
Sorbonne Université, CNRS, MNHN, IRD, Institut de
Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC),
4 place Jussieu, 7552 Paris CEDEX 05, France
Institut de Recherche pour le Développement (IRD), 101 Promenade
Roger Laroque, Anse Vata, 98848, Nouméa, New Caledonia
Etienne Balan
Sorbonne Université, CNRS, MNHN, IRD, Institut de
Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC),
4 place Jussieu, 7552 Paris CEDEX 05, France
Sabine Petit
Institut de Chimie des Milieux et Matériaux de Poitiers
(IC2MP), Université de Poitiers, CNRS (UMR 7285), 6 rue Michel Brunet,
86073 Poitiers CEDEX 9, France
Farid Juillot
Sorbonne Université, CNRS, MNHN, IRD, Institut de
Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC),
4 place Jussieu, 7552 Paris CEDEX 05, France
Institut de Recherche pour le Développement (IRD), 101 Promenade
Roger Laroque, Anse Vata, 98848, Nouméa, New Caledonia
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Etienne Balan, Emmanuel Fritsch, Guillaume Radtke, Lorenzo Paulatto, Farid Juillot, Fabien Baron, and Sabine Petit
Eur. J. Mineral., 33, 647–657, https://doi.org/10.5194/ejm-33-647-2021, https://doi.org/10.5194/ejm-33-647-2021, 2021
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Interpretation of vibrational spectra of serpentines is complexified by the common occurrence of divalent and trivalent cationic impurities at tetrahedral and octahedral sites. We theoretically investigate the effect of Fe and Al on the vibrational properties of lizardite, focusing on the OH stretching modes. The results allow us to disentangle the specific effects related to the valence and coordination states of the impurities, supporting a detailed interpretation of the experimental spectra.
Emmanuel Fritsch, Etienne Balan, Sabine Petit, and Farid Juillot
Eur. J. Mineral., 33, 447–462, https://doi.org/10.5194/ejm-33-447-2021, https://doi.org/10.5194/ejm-33-447-2021, 2021
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The study provides new insights into the OH stretching vibrations of serpentine species (lizardite, chrysotile, antigorite) encountered in veins of peridotite. A combination of infrared spectroscopy in the mid-infrared and near-infrared ranges and Raman spectroscopy enabled us to interpret most of the observed bands in the fundamental and first overtone regions of the spectra and to propose consistent spectral decomposition and assignment of the OH stretching bands for the serpentine species.
Etienne Balan, Emmanuel Fritsch, Guillaume Radtke, Lorenzo Paulatto, Farid Juillot, and Sabine Petit
Eur. J. Mineral., 33, 389–400, https://doi.org/10.5194/ejm-33-389-2021, https://doi.org/10.5194/ejm-33-389-2021, 2021
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The infrared absorption spectrum of an antigorite sample, an important serpentine-group mineral, is compared to its theoretical counterpart computed at the density functional level. The model reproduces most of the observed bands, supporting their assignment to specific vibrational modes. The results provide robust interpretations of the significant differences observed between the antigorite spectrum and that of lizardite, the more symmetric serpentine variety.
Etienne Balan, Emmanuel Fritsch, Farid Juillot, Thierry Allard, and Sabine Petit
Eur. J. Mineral., 33, 209–220, https://doi.org/10.5194/ejm-33-209-2021, https://doi.org/10.5194/ejm-33-209-2021, 2021
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The OH overtone bands of kaolinite- and serpentine-group minerals observed in their near-infrared (NIR) spectra are widely used but their relation to stretching modes involving coupled OH groups is uncertain. Here, we map a molecular model of harmonically coupled anharmonic oscillators on the spectroscopic properties of 1:1 phyllosilicates. This makes it possible to interpret most of the observed bands and support the assignment of some of them to cationic substitutions in serpentines.
Michael C. Jollands, Shiyun Jin, Martial Curti, Maxime Guillaumet, Keevin Béneut, Paola Giura, and Etienne Balan
Eur. J. Mineral., 35, 873–890, https://doi.org/10.5194/ejm-35-873-2023, https://doi.org/10.5194/ejm-35-873-2023, 2023
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The infrared spectrum of hydrous defects in corundum is routinely used in gemology, but the assignment of absorption bands to specific defects remains elusive. Here, we theoretically study selected defects and compare the results with available experimental data. The main results are the assignment of the
3161 cm−1 seriesto OH groups associated with Fe2+ ions and the interpretation of bands below 2700 cm−1 in corundum containing divalent cations in terms of overtones of OH bending modes.
Etienne Balan, Guillaume Radtke, Chloé Fourdrin, Lorenzo Paulatto, Heinrich A. Horn, and Yves Fuchs
Eur. J. Mineral., 35, 105–116, https://doi.org/10.5194/ejm-35-105-2023, https://doi.org/10.5194/ejm-35-105-2023, 2023
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Assignment of OH-stretching bands to specific atomic-scale environments in tourmaline is still debated, which motivates detailed theoretical studies of their vibrational properties. We have theoretically investigated the OH-stretching spectrum of foitite, showing that specific OH bands observed in the vibrational spectra of iron-rich and Na-deficient tourmalines are affected by the magnetic configuration of iron ions and X-site vacancy ordering.
Etienne Balan, Lorenzo Paulatto, Qianyu Deng, Keevin Béneut, Maxime Guillaumet, and Benoît Baptiste
Eur. J. Mineral., 34, 627–643, https://doi.org/10.5194/ejm-34-627-2022, https://doi.org/10.5194/ejm-34-627-2022, 2022
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The near-infrared spectra of hydrous minerals involve OH stretching vibrations, but their interpretation is not straightforward due to anharmonicity and vibrational coupling. We analyze the spectra of well-ordered samples of talc, brucite and lizardite to better assess the various factors contributing to the absorption bands. The results clarify the relations between the overtone spectra and their fundamental counterparts and provide a sound interpretation of the two-phonon combination bands.
Yves Fuchs, Chloé Fourdrin, and Etienne Balan
Eur. J. Mineral., 34, 239–251, https://doi.org/10.5194/ejm-34-239-2022, https://doi.org/10.5194/ejm-34-239-2022, 2022
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Information about the local structure of tourmaline-group minerals can be obtained from the characteristic OH stretching bands in their vibrational spectra. However, their assignment to specific atomic-scale environments is debated. We address this question theoretically by investigating a series of dravite models. Our results support a local role of cationic occupancies in determining the OH stretching frequencies and bring constraints for the interpretation of the vibrational spectra.
Etienne Balan, Emmanuel Fritsch, Guillaume Radtke, Lorenzo Paulatto, Farid Juillot, Fabien Baron, and Sabine Petit
Eur. J. Mineral., 33, 647–657, https://doi.org/10.5194/ejm-33-647-2021, https://doi.org/10.5194/ejm-33-647-2021, 2021
Short summary
Short summary
Interpretation of vibrational spectra of serpentines is complexified by the common occurrence of divalent and trivalent cationic impurities at tetrahedral and octahedral sites. We theoretically investigate the effect of Fe and Al on the vibrational properties of lizardite, focusing on the OH stretching modes. The results allow us to disentangle the specific effects related to the valence and coordination states of the impurities, supporting a detailed interpretation of the experimental spectra.
Emmanuel Fritsch, Etienne Balan, Sabine Petit, and Farid Juillot
Eur. J. Mineral., 33, 447–462, https://doi.org/10.5194/ejm-33-447-2021, https://doi.org/10.5194/ejm-33-447-2021, 2021
Short summary
Short summary
The study provides new insights into the OH stretching vibrations of serpentine species (lizardite, chrysotile, antigorite) encountered in veins of peridotite. A combination of infrared spectroscopy in the mid-infrared and near-infrared ranges and Raman spectroscopy enabled us to interpret most of the observed bands in the fundamental and first overtone regions of the spectra and to propose consistent spectral decomposition and assignment of the OH stretching bands for the serpentine species.
Etienne Balan, Emmanuel Fritsch, Guillaume Radtke, Lorenzo Paulatto, Farid Juillot, and Sabine Petit
Eur. J. Mineral., 33, 389–400, https://doi.org/10.5194/ejm-33-389-2021, https://doi.org/10.5194/ejm-33-389-2021, 2021
Short summary
Short summary
The infrared absorption spectrum of an antigorite sample, an important serpentine-group mineral, is compared to its theoretical counterpart computed at the density functional level. The model reproduces most of the observed bands, supporting their assignment to specific vibrational modes. The results provide robust interpretations of the significant differences observed between the antigorite spectrum and that of lizardite, the more symmetric serpentine variety.
Etienne Balan, Emmanuel Fritsch, Farid Juillot, Thierry Allard, and Sabine Petit
Eur. J. Mineral., 33, 209–220, https://doi.org/10.5194/ejm-33-209-2021, https://doi.org/10.5194/ejm-33-209-2021, 2021
Short summary
Short summary
The OH overtone bands of kaolinite- and serpentine-group minerals observed in their near-infrared (NIR) spectra are widely used but their relation to stretching modes involving coupled OH groups is uncertain. Here, we map a molecular model of harmonically coupled anharmonic oscillators on the spectroscopic properties of 1:1 phyllosilicates. This makes it possible to interpret most of the observed bands and support the assignment of some of them to cationic substitutions in serpentines.
Etienne Balan, Lorenzo Paulatto, Jia Liu, and Jannick Ingrin
Eur. J. Mineral., 32, 505–520, https://doi.org/10.5194/ejm-32-505-2020, https://doi.org/10.5194/ejm-32-505-2020, 2020
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The atomic-scale geometry of hydrous defects in diopside is still imperfectly known despite their contribution to the Earth's water cycle. Their OH-stretching vibrations lead to a variety of infrared absorption bands. Low-temperature infrared spectroscopy makes it possible to resolve additional bands in the spectra of gem-quality natural samples. Theoretical results obtained at the density functional theory level support the assignment of the observed bands to specific atomic-scale models.
Etienne Balan
Eur. J. Mineral., 32, 457–467, https://doi.org/10.5194/ejm-32-457-2020, https://doi.org/10.5194/ejm-32-457-2020, 2020
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Corundum is an important oxide mineral which can contain low amounts of hydrogen-bearing structural defects. These defects are observed by infrared spectroscopy, but their atomic-scale geometry is still uncertain. Here, a theoretical approach makes it possible to relate most of the observed infrared bands to specific atomic configurations, highlighting the key role of other chemical impurities and defect clustering in the high-temperature incorporation of hydrogen in corundum.
Michael C. Jollands, Marc Blanchard, and Etienne Balan
Eur. J. Mineral., 32, 311–323, https://doi.org/10.5194/ejm-32-311-2020, https://doi.org/10.5194/ejm-32-311-2020, 2020
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Quartz is a very common form of almost pure silica. It can contain a small concentration of hydrogen-bearing defects whose nature is still debated. Here, we use a theoretical approach to unravel the atomic-scale geometry of these defects. Our findings help explain some important quartz properties.
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Ore deposits and mineral resources
First in situ Lu–Hf garnet date for a lithium–caesium–tantalum (LCT) pegmatite from the Kietyönmäki Li deposit, Somero–Tammela pegmatite region, SW Finland
Mineralogy and mineral chemistry of detrital platinum-group minerals and gold particles from the Elbe, Germany
Multistage fluorite mineralization in the southern Black Forest, Germany: evidence from rare earth element (REE) geochemistry
New data on gersdorffite and associated minerals from the Peloritani Mountains (Sicily, Italy)
A remarkable discovery of electrum on the island of Sylt, northern Germany, and its Scandinavian origin
Krisztián Szentpéteri, Kathryn Cutts, Stijn Glorie, Hugh O'Brien, Sari Lukkari, Radoslaw M. Michallik, and Alan Butcher
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Short summary
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In situ Lu–Hf geochronology of garnet is applied to date a Finnish lithium–caesium–tantalum (LCT) pegmatite from the Somero–Tammela pegmatite region. The age obtained was 1801 ± 53 Ma, which is consistent with zircon ages of 1815–1740 Ma obtained from the same pegmatite. We show the in situ Lu–Hf method is a fast way of obtaining reliable age dates from LCT pegmatites.
Malte Junge, Simon Goldmann, and Hermann Wotruba
Eur. J. Mineral., 35, 439–459, https://doi.org/10.5194/ejm-35-439-2023, https://doi.org/10.5194/ejm-35-439-2023, 2023
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The analysis by electron microprobe of platinum-group minerals, gold and cinnabar particles from heavy mineral concentrates of the Elbe showed a broad compositional variation of Os–Rus–Irs–(Pt) alloys as well as Pts–Fe alloys. The comparison with the literature showed that different sources account for the heavy mineral concentrate. This compositional variation of the alloys is also of interest for other placers of platinum-group minerals worldwide.
Robin Hintzen, Wolfgang Werner, Michael Hauck, Reiner Klemd, and Lennart A. Fischer
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The diversity of chemical patterns in multi-stage fluorite mineralization from two neighbouring deposits in the Black Forest is investigated. From over 70 samples, 7 fluorite groups and 3 hydrothermal events are identified after chemical and mathematical classification. The relative chronology and features suggest different mineralization histories and source aquifers for both deposits despite their proximity. Genetic differences are likely controlled by different behaviours of their host rocks.
Daniela Mauro, Cristian Biagioni, and Federica Zaccarini
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This work reports the full crystal-chemical characterization of gersdorffite from Contrada Zillì (Peloritani Mountains, Sicily, Italy). The structural type shown by gersdorffite (ordered polytype 213) and its chemistry agree with low-temperature crystallization conditions. Moreover, the chemical zoning of the studied crystals recorded changes in the crystallization physicochemical conditions. This zoning may be due to a multistage crystallization, related to the evolution of the ore deposits.
Jochen Schlüter, Stephan Schuth, Raúl O. C. Fonseca, and Daniel Wendt
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On the west coast of the German North Sea island of Sylt, an electrum–quartz pebble weighing 10.4 g was discovered in a cliff of Saalian glaciogenic sediments. This is an unusually large and rare precious metal to find. Within our paper we document and characterize this discovery. An attempt to investigate its provenance points towards a southern Norwegian origin. This leads to the conclusion that ice advance events were involved in transporting this pebble from Norway to Germany.
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Short summary
The study presents and discusses mid- and near-infrared spectra of three Mg–Ni mineral series (serpentine-like and talc-like minerals, sepiolite) commonly found in reactivated faults and sequences of clay infillings of the New Caledonian Ni-silicate deposits. This spectroscopic study sheds light on the nature of the residual mineral phases found in the clay infillings (serpentine-like minerals) and reveals the aptitude of the newly formed minerals (talc-like minerals and sepiolite) to store Ni.
The study presents and discusses mid- and near-infrared spectra of three Mg–Ni mineral series...