Articles | Volume 37, issue 1
https://doi.org/10.5194/ejm-37-1-2025
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the Creative Commons Attribution 4.0 License.
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https://doi.org/10.5194/ejm-37-1-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
06 Jan 2025
Research article |
| 06 Jan 2025
| 06 Jan 2025
Insights from the compositional evolution of a multi-coloured, zoned tourmaline from the Cruzeiro pegmatite, Minas Gerais, Brazil
Giovanni B. Andreozzi
CORRESPONDING AUTHOR
Department of Earth Sciences, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy
CNR–IGAG c/o Department of Earth Sciences, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy
Claudia Gori
independent researcher: Largo Gaetano De Sanctis, 7, 00179 Rome, Italy
Henrik Skogby
Department of Geosciences, Swedish Museum of Natural History, P.O. Box 50007, 10405 Stockholm, Sweden
Ulf Hålenius
Department of Geosciences, Swedish Museum of Natural History, P.O. Box 50007, 10405 Stockholm, Sweden
Alessandra Altieri
Department of Earth Sciences, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy
Ferdinando Bosi
Department of Earth Sciences, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy
CNR–IGAG c/o Department of Earth Sciences, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy
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Beatrice Celata, Ferdinando Bosi, Kira A. Musiyachenko, Andrey V. Korsakov, and Giovanni B. Andreozzi
Eur. J. Mineral., 36, 797–811, https://doi.org/10.5194/ejm-36-797-2024, https://doi.org/10.5194/ejm-36-797-2024, 2024
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The discovery of the K-dominant tourmaline maruyamaite with microdiamond inclusions suggested its ultrahigh-pressure formation. We analyzed the role of K in the tourmaline structure, with a special focus on its stability. High pressure is necessary to squeeze the large cation K+ in the stiff framework of tourmaline, although K is the underdog component if Na+ is present in the mineralizing fluid. K-tourmaline is stable at high pressure, overcoming the stereotype of a mere crustal component.
Alessandra Altieri, Federico Pezzotta, Giovanni B. Andreozzi, Henrik Skogby, and Ferdinando Bosi
Eur. J. Mineral., 35, 755–771, https://doi.org/10.5194/ejm-35-755-2023, https://doi.org/10.5194/ejm-35-755-2023, 2023
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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.
Dan Holtstam, Fernando Cámara, Henrik Skogby, Andreas Karlsson, and Alessandro De Leo
Eur. J. Mineral., 37, 221–231, https://doi.org/10.5194/ejm-37-221-2025, https://doi.org/10.5194/ejm-37-221-2025, 2025
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The mineral clino-ferro-suenoite, with the chemical formula ◻Mn2Fe2+5Si8O22(OH)2, was historically named “dannemorite” or “manganogrunerite” and is a member of the amphibole supergroup. It is now formally approved by the International Mineralogical Association. It occurs in iron–manganese-bearing rock from the Hilläng mines, Dalarna, Sweden, and is associated with the minerals fayalite, spessartine, ferro-actinolite, calcite, magnetite and pyrite. It formed by replacement of Mn-bearing fayalite.
Ferdinando Bosi, Frédéric Hatert, Marco Pasero, and Stuart J. Mills
Eur. J. Mineral., 37, 75–78, https://doi.org/10.5194/ejm-37-75-2025, https://doi.org/10.5194/ejm-37-75-2025, 2025
Ferdinando Bosi, Frédéric Hatert, Marco Pasero, and Stuart J. Mills
Eur. J. Mineral., 36, 1005–1010, https://doi.org/10.5194/ejm-36-1005-2024, https://doi.org/10.5194/ejm-36-1005-2024, 2024
Ferdinando Bosi, Frédéric Hatert, Marco Pasero, and Stuart J. Mills
Eur. J. Mineral., 36, 917–923, https://doi.org/10.5194/ejm-36-917-2024, https://doi.org/10.5194/ejm-36-917-2024, 2024
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The discovery of the K-dominant tourmaline maruyamaite with microdiamond inclusions suggested its ultrahigh-pressure formation. We analyzed the role of K in the tourmaline structure, with a special focus on its stability. High pressure is necessary to squeeze the large cation K+ in the stiff framework of tourmaline, although K is the underdog component if Na+ is present in the mineralizing fluid. K-tourmaline is stable at high pressure, overcoming the stereotype of a mere crustal component.
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Eur. J. Mineral., 36, 599–604, https://doi.org/10.5194/ejm-36-599-2024, https://doi.org/10.5194/ejm-36-599-2024, 2024
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Eur. J. Mineral., 36, 525–528, https://doi.org/10.5194/ejm-36-525-2024, https://doi.org/10.5194/ejm-36-525-2024, 2024
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Daniel Atencio, Andrezza A. Azzi, Kai Qu, Ritsuro Miyawaki, Ferdinando Bosi, and Koichi Momma
Eur. J. Mineral., 35, 1027–1030, https://doi.org/10.5194/ejm-35-1027-2023, https://doi.org/10.5194/ejm-35-1027-2023, 2023
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This article introduces a new nomenclature system for the cerite group minerals. This system was necessary to allow the nomenclature of new species of minerals that are currently being described.
Ian E. Grey, Stephanie Boer, Colin M. MacRae, Nicholas C. Wilson, William G. Mumme, and Ferdinando Bosi
Eur. J. Mineral., 35, 909–919, https://doi.org/10.5194/ejm-35-909-2023, https://doi.org/10.5194/ejm-35-909-2023, 2023
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Ferdinando Bosi, Frédéric Hatert, Marco Pasero, and Stuart J. Mills
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A new mineral has been discovered, an amphibole, with the name ferri-taramite, which has now been approved by the International Mineralogical Association. The paper discusses the significance of the discovery in relation to other amphiboles found worldwide. This taramite is unique in that it is from a skarn associated with ore and is not of magmatic origin. For the description we have used many methods, including X-ray diffraction, chemical analyses and several types of spectroscopy.
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Type material for heliophyllite, preserved in the Swedish Museum of Natural History in Stockholm, was re-investigated through a combined EPMA (electron probe X-ray microanalysis), Raman, and X-ray powder diffraction (XRPD) and single-crystal study. EPMA chemical data, together with Raman and single-crystal structural studies, point to heliophyllite being identical to ecdemite. XRPD synchrotron data highlight the presence of a minor quantity of finely admixed finnemanite in the analyzed material.
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Short summary
The compositional variation in a multi-coloured, zoned tourmaline from the Cruzeiro pegmatite, Brazil, reflects melt chemical evolution during the entire pegmatite differentiation. In uncontaminated granitic pegmatite systems such as that of Cruzeiro, the compositional evolution of tourmaline progresses from schorl to fluor-elbaite, rather than directly from schorl to elbaite, to reflect co-enrichment in Li and F during fractional crystallization.
The compositional variation in a multi-coloured, zoned tourmaline from the Cruzeiro pegmatite,...
