Articles | Volume 38, issue 3
https://doi.org/10.5194/ejm-38-325-2026
© Author(s) 2026. 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-38-325-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
New minerals, nomenclature, and classification
| 
11 Jun 2026
New minerals, nomenclature, and classification |
| 11 Jun 2026
| 11 Jun 2026
Argentotennantite-(Fe), Ag6(Cu4Fe2)As4S13, a new member of the tetrahedrite group from the San Genaro mine, Peru: occurrence and crystal structure
Jiří Sejkora
CORRESPONDING AUTHOR
Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, 193 00, Praha 9, Czech Republic
Earth Sciences Institute, v.v.i., Slovak Academy of Sciences, Dúbravská cesta 9, 840 05 Bratislava, Slovakia
Dalibor Velebil
Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, 193 00, Praha 9, Czech Republic
Cristian Biagioni
Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria, 53, 56126 Pisa, Italy
Centro per l'Integrazione della Strumentazione scientifica dell'Università di Pisa (CISUP), Università di Pisa, Pisa, Italy
Zdeněk Dolníček
Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, 193 00, Praha 9, Czech Republic
Jaroslav Hyršl
Ke kurtům 383, 142 00 Praha 4, Czech Republic
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Ondřej Krátký, Jan Cempírek, Sebastián Hreus, Luboš Vrtiška, Jiří Sejkora, Zdeněk Dolníček, Jakub Výravský, Radek Škoda, Karel Breiter, and Vojtěch Šešulka
Eur. J. Mineral., 38, 281–304, https://doi.org/10.5194/ejm-38-281-2026, https://doi.org/10.5194/ejm-38-281-2026, 2026
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Mineralogical, paragenetic, and geochemical data on sulfidic mineralization from the Cínovec greisen-type deposit show that distribution of sulfides is irregular and not strictly bound to prevalent Li–Sn–W mineralization. Progressive development of metal contents in the reduced sulfide-bearing hydrothermal fluid proceeds from Zn–Cu–Sn to Pb–Bi–Ag and As–Sb. Late-stage sulfate- and fluorine-bearing fluids partly altered earlier mineralization but did not deposit significant ore content.
Cristian Biagioni, Jiří Sejkora, Yves Moëlo, Antonino Criscuolo, and Zdeněk Dolníček
Eur. J. Mineral., 38, 153–167, https://doi.org/10.5194/ejm-38-153-2026, https://doi.org/10.5194/ejm-38-153-2026, 2026
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Delchiaroite is the first iodide–methanethiolate mineral and represents an interesting example where organic chemistry meets mineralogy.
Cristian Biagioni, Jiří Sejkora, Natale Perchiazzi, Enrico Mugnaioli, Daniela Mauro, Donato Belmonte, Radek Škoda, and Zdeněk Dolníček
Eur. J. Mineral., 37, 733–746, https://doi.org/10.5194/ejm-37-733-2025, https://doi.org/10.5194/ejm-37-733-2025, 2025
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Marioantofilliite, ideally [Cu4Al2(OH)12](CO3)•3H2O, is a new member of the hydrotalcite supergroup occurring as a supergene mineral in the Cu–Fe deposit of Monte Copello–Reppia (Liguria, Italy). Its name honours Mario Antofilli (1920–1983) for his contribution to the knowledge of the mineralogy of Liguria. Its discovery and description improve the knowledge of layered double hydroxides (LD), with implications for the group of Cu–Al LDH actively studied for its technological properties.
Ferdinando Bosi, Federico Pezzotta, Henrik Skobgy, Riccardo Luppi, Paolo Ballirano, Ulf Hålenius, Gioacchino Tempesta, Giovanna Agrosì, and Jiří Sejkora
Eur. J. Mineral., 37, 505–516, https://doi.org/10.5194/ejm-37-505-2025, https://doi.org/10.5194/ejm-37-505-2025, 2025
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This study describes the elbaite neotype, found in crystals from a site on Elba island, Italy. Researchers analyzed these nearly colorless crystals and found that their formation was influenced by earlier changes in the surrounding rock. As different minerals formed first, they set the stage for elbaite to develop later in deeper spaces. This work helps us understand how changes in the local environment affect how and when certain minerals grow.
Cristian Biagioni, Jiří Sejkora, Yves Moëlo, Georges Favreau, Vincent Bourgoin, Jean-Claude Boulliard, Elena Bonaccorsi, Daniela Mauro, Silvia Musetti, Marco Pasero, Natale Perchiazzi, and Jana Ulmanová
Eur. J. Mineral., 37, 319–335, https://doi.org/10.5194/ejm-37-319-2025, https://doi.org/10.5194/ejm-37-319-2025, 2025
Short summary
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Ginelfite is a new Ag–Fe–Tl–Pb sulfosalt described from the hydrothermal deposit of Jas Roux (France). It belongs to the so-called boxwork sulfosalts, a group of species showing the highest structural complexity among this group of chalcogenides. This very complex structure is probably stabilized by the occurrence of minor chemical constituents (Tl, Fe) occupying specific structural positions.
Cristian Biagioni, Daniela Mauro, Jiří Sejkora, Zdeněk Dolníček, Andrea Dini, and Radek Škoda
Eur. J. Mineral., 37, 39–52, https://doi.org/10.5194/ejm-37-39-2025, https://doi.org/10.5194/ejm-37-39-2025, 2025
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Dacostaite is a new fluoride–arsenate mineral found in the Sb(Au) deposit of the Cetine di Cotorniano Mine (Tuscany, Italy). It shows a novel crystal structure formed by heteropolyhedral layers and isolated Mg(H2O)6 groups connected by H bonds. The heteropolyhedral layers are similar to those occurring in alunite-supergroup minerals, and this is a further example of the ability of nature to use similar modules in forming the large number of currently known structural arrangements.
Cristian Biagioni, Enrico Mugnaioli, Sofia Lorenzon, Daniela Mauro, Silvia Musetti, Jiří Sejkora, Donato Belmonte, Nicola Demitri, and Zdeněk Dolníček
Eur. J. Mineral., 36, 1011–1022, https://doi.org/10.5194/ejm-36-1011-2024, https://doi.org/10.5194/ejm-36-1011-2024, 2024
Short summary
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Nannoniite, Al2(OH)5F, is a new mineral species discovered in the Cetine di Cotorniano mine (Tuscany, Italy). Its description was possible through a multi-technique approach, and its crystal structure was solved through three-dimensional electron diffraction, revealing close relations with gibbsite. The partial replacement of (OH) by F induces subtle by detectable structural changes. This study reveals that Al hydroxides could be a source of F in geological environments.
Richard Pažout, Michal Dušek, Jiří Sejkora, Jakub Plášil, Gheorghe Ilinca, and Zdeněk Dolníček
Eur. J. Mineral., 36, 641–656, https://doi.org/10.5194/ejm-36-641-2024, https://doi.org/10.5194/ejm-36-641-2024, 2024
Short summary
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A new sulfosalt mineral species, lazerckerite, Ag3.7Pb4.6(Sb7.9Bi3.8)Σ11.7S24, has been found, identified, structurally solved, and approved by the IMA. The mineral belongs to the Sb–Bi mixed members of the andorite branch of the lillianite homologous series. The description and characterization of the mineral are presented, and the ways of distinguishing the mineral from other similar members of the group on the basis of chemical results are explained.
Jiří Sejkora, Cristian Biagioni, Pavel Škácha, Silvia Musetti, Anatoly V. Kasatkin, and Fabrizio Nestola
Eur. J. Mineral., 35, 897–907, https://doi.org/10.5194/ejm-35-897-2023, https://doi.org/10.5194/ejm-35-897-2023, 2023
Short summary
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We present the description of new mineral – a Cd-dominant member of the tetrahedrite group, tetrahedrite-(Cd), from the Radětice deposit near Příbram, Czech Republic. All necessary data including crystal structure were successfully determined, and the mineral and its name have been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (number 2022-115).
Daniela Mauro, Cristian Biagioni, Jiří Sejkora, Zdeněk Dolníček, and Radek Škoda
Eur. J. Mineral., 35, 703–714, https://doi.org/10.5194/ejm-35-703-2023, https://doi.org/10.5194/ejm-35-703-2023, 2023
Short summary
Short summary
Batoniite is a new mineral species belonging to the Al2O3–SO3–H2O ternary system, first found in the Cetine di Cotorniano Mine (Tuscany, Italy). This hydrated Al sulfate shows a novel crystal structure, characterized by Al octamers, so far reported in only synthetic compounds.
Luboš Vrtiška, Jaromír Tvrdý, Jakub Plášil, Jiří Sejkora, Radek Škoda, Nikita V. Chukanov, Andreas Massanek, Jan Filip, Zdeněk Dolníček, and František Veselovský
Eur. J. Mineral., 34, 223–238, https://doi.org/10.5194/ejm-34-223-2022, https://doi.org/10.5194/ejm-34-223-2022, 2022
Short summary
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The study of the original material of beraunite from the type locality Hrbek, Czech Rep., from collections of the TU Bergakademie Freiberg (Germany) and National Museum Prague (Czech Republic) proved the identity of the minerals beraunite and eleonorite. Because the name beraunite has priority, we consider the name eleonorite to be redundant and proposed to abolish it. The proposal 21-D approved by the IMA discredited eleonorite and accepted the formula of beraunite Fe3+6(PO4)4O(OH)4·6H2O.
Ondřej Krátký, Jan Cempírek, Sebastián Hreus, Luboš Vrtiška, Jiří Sejkora, Zdeněk Dolníček, Jakub Výravský, Radek Škoda, Karel Breiter, and Vojtěch Šešulka
Eur. J. Mineral., 38, 281–304, https://doi.org/10.5194/ejm-38-281-2026, https://doi.org/10.5194/ejm-38-281-2026, 2026
Short summary
Short summary
Mineralogical, paragenetic, and geochemical data on sulfidic mineralization from the Cínovec greisen-type deposit show that distribution of sulfides is irregular and not strictly bound to prevalent Li–Sn–W mineralization. Progressive development of metal contents in the reduced sulfide-bearing hydrothermal fluid proceeds from Zn–Cu–Sn to Pb–Bi–Ag and As–Sb. Late-stage sulfate- and fluorine-bearing fluids partly altered earlier mineralization but did not deposit significant ore content.
Cristian Biagioni, Jiří Sejkora, Yves Moëlo, Antonino Criscuolo, and Zdeněk Dolníček
Eur. J. Mineral., 38, 153–167, https://doi.org/10.5194/ejm-38-153-2026, https://doi.org/10.5194/ejm-38-153-2026, 2026
Short summary
Short summary
Delchiaroite is the first iodide–methanethiolate mineral and represents an interesting example where organic chemistry meets mineralogy.
Cristian Biagioni, Elena Bonaccorsi, Marco Pasero, Ulf Hålenius, and Ferdinando Bosi
Eur. J. Mineral., 37, 761–772, https://doi.org/10.5194/ejm-37-761-2025, https://doi.org/10.5194/ejm-37-761-2025, 2025
Short summary
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Suenoite is a new Pnma amphibole discovered in the Mn ore deposit of Scortico–Ravazzone, Apuan Alps, Tuscany, Italy. Its discovery adds further complexity to the amphibole supergroup, and it represents the first Pnma amphibole with BMn2+.
Cristian Biagioni, Jiří Sejkora, Natale Perchiazzi, Enrico Mugnaioli, Daniela Mauro, Donato Belmonte, Radek Škoda, and Zdeněk Dolníček
Eur. J. Mineral., 37, 733–746, https://doi.org/10.5194/ejm-37-733-2025, https://doi.org/10.5194/ejm-37-733-2025, 2025
Short summary
Short summary
Marioantofilliite, ideally [Cu4Al2(OH)12](CO3)•3H2O, is a new member of the hydrotalcite supergroup occurring as a supergene mineral in the Cu–Fe deposit of Monte Copello–Reppia (Liguria, Italy). Its name honours Mario Antofilli (1920–1983) for his contribution to the knowledge of the mineralogy of Liguria. Its discovery and description improve the knowledge of layered double hydroxides (LD), with implications for the group of Cu–Al LDH actively studied for its technological properties.
Ferdinando Bosi, Federico Pezzotta, Henrik Skobgy, Riccardo Luppi, Paolo Ballirano, Ulf Hålenius, Gioacchino Tempesta, Giovanna Agrosì, and Jiří Sejkora
Eur. J. Mineral., 37, 505–516, https://doi.org/10.5194/ejm-37-505-2025, https://doi.org/10.5194/ejm-37-505-2025, 2025
Short summary
Short summary
This study describes the elbaite neotype, found in crystals from a site on Elba island, Italy. Researchers analyzed these nearly colorless crystals and found that their formation was influenced by earlier changes in the surrounding rock. As different minerals formed first, they set the stage for elbaite to develop later in deeper spaces. This work helps us understand how changes in the local environment affect how and when certain minerals grow.
Giuseppe Illuminati, Silvia Musetti, Fabio Bellatreccia, Cristian Biagioni, Enrico Caprilli, Ahmad Rabiee, and Marco E. Ciriotti
Eur. J. Mineral., 37, 483–504, https://doi.org/10.5194/ejm-37-483-2025, https://doi.org/10.5194/ejm-37-483-2025, 2025
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In this work, we present the most iron-rich chrysoberyl discovered to date, found in the Sabatini Volcanic Complex (Latium, Italy). We provide a comprehensive overview of its chemical, structural, spectroscopic, and optical properties. The characterization of this chrysoberyl reveals several unique features, offering valuable insights into its genetic model and geochemical constraints, which are consistent with existing literature on the Sabatini complex and with ongoing research.
Cristian Biagioni, Jiří Sejkora, Yves Moëlo, Georges Favreau, Vincent Bourgoin, Jean-Claude Boulliard, Elena Bonaccorsi, Daniela Mauro, Silvia Musetti, Marco Pasero, Natale Perchiazzi, and Jana Ulmanová
Eur. J. Mineral., 37, 319–335, https://doi.org/10.5194/ejm-37-319-2025, https://doi.org/10.5194/ejm-37-319-2025, 2025
Short summary
Short summary
Ginelfite is a new Ag–Fe–Tl–Pb sulfosalt described from the hydrothermal deposit of Jas Roux (France). It belongs to the so-called boxwork sulfosalts, a group of species showing the highest structural complexity among this group of chalcogenides. This very complex structure is probably stabilized by the occurrence of minor chemical constituents (Tl, Fe) occupying specific structural positions.
Cristian Biagioni, Daniela Mauro, Jiří Sejkora, Zdeněk Dolníček, Andrea Dini, and Radek Škoda
Eur. J. Mineral., 37, 39–52, https://doi.org/10.5194/ejm-37-39-2025, https://doi.org/10.5194/ejm-37-39-2025, 2025
Short summary
Short summary
Dacostaite is a new fluoride–arsenate mineral found in the Sb(Au) deposit of the Cetine di Cotorniano Mine (Tuscany, Italy). It shows a novel crystal structure formed by heteropolyhedral layers and isolated Mg(H2O)6 groups connected by H bonds. The heteropolyhedral layers are similar to those occurring in alunite-supergroup minerals, and this is a further example of the ability of nature to use similar modules in forming the large number of currently known structural arrangements.
Cristian Biagioni, Enrico Mugnaioli, Sofia Lorenzon, Daniela Mauro, Silvia Musetti, Jiří Sejkora, Donato Belmonte, Nicola Demitri, and Zdeněk Dolníček
Eur. J. Mineral., 36, 1011–1022, https://doi.org/10.5194/ejm-36-1011-2024, https://doi.org/10.5194/ejm-36-1011-2024, 2024
Short summary
Short summary
Nannoniite, Al2(OH)5F, is a new mineral species discovered in the Cetine di Cotorniano mine (Tuscany, Italy). Its description was possible through a multi-technique approach, and its crystal structure was solved through three-dimensional electron diffraction, revealing close relations with gibbsite. The partial replacement of (OH) by F induces subtle by detectable structural changes. This study reveals that Al hydroxides could be a source of F in geological environments.
Richard Pažout, Michal Dušek, Jiří Sejkora, Jakub Plášil, Gheorghe Ilinca, and Zdeněk Dolníček
Eur. J. Mineral., 36, 641–656, https://doi.org/10.5194/ejm-36-641-2024, https://doi.org/10.5194/ejm-36-641-2024, 2024
Short summary
Short summary
A new sulfosalt mineral species, lazerckerite, Ag3.7Pb4.6(Sb7.9Bi3.8)Σ11.7S24, has been found, identified, structurally solved, and approved by the IMA. The mineral belongs to the Sb–Bi mixed members of the andorite branch of the lillianite homologous series. The description and characterization of the mineral are presented, and the ways of distinguishing the mineral from other similar members of the group on the basis of chemical results are explained.
Cristian Biagioni, Anatoly V. Kasatkin, Fabrizio Nestola, Radek Škoda, Vladislav V. Gurzhiy, Atali A. Agakhanov, and Natalia N. Koshlyakova
Eur. J. Mineral., 36, 529–540, https://doi.org/10.5194/ejm-36-529-2024, https://doi.org/10.5194/ejm-36-529-2024, 2024
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Zvěstovite-(Fe) is a new, Ag-rich, member of the tetrahedrite group, the most widespread sulfosalts in ore deposits. Its discovery stresses the chemical variability of this mineral group, allowing for a better understanding of the structural plasticity of these compounds, which are able to host a plethora of different elements typical of hydrothermal environments.
Jonas Toupal, Daniela Mauro, Cristian Biagioni, Federica Zaccarini, and Reto Gieré
Eur. J. Mineral., 36, 1–10, https://doi.org/10.5194/ejm-36-1-2024, https://doi.org/10.5194/ejm-36-1-2024, 2024
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In this work, we refine the crystal structure of childrenite. Additionally, we provide compositional data to substantially extend the published solid-solution series between childrenite and eosphorite, the Fe and Mn endmembers, respectively. We analyze the valence state of iron to avoid erroneous classification of ernstite or potential discovery of "oxychildrenite", a mineral species not yet confirmed to be stable in nature.
Jiří Sejkora, Cristian Biagioni, Pavel Škácha, Silvia Musetti, Anatoly V. Kasatkin, and Fabrizio Nestola
Eur. J. Mineral., 35, 897–907, https://doi.org/10.5194/ejm-35-897-2023, https://doi.org/10.5194/ejm-35-897-2023, 2023
Short summary
Short summary
We present the description of new mineral – a Cd-dominant member of the tetrahedrite group, tetrahedrite-(Cd), from the Radětice deposit near Příbram, Czech Republic. All necessary data including crystal structure were successfully determined, and the mineral and its name have been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (number 2022-115).
Daniela Mauro, Cristian Biagioni, Jiří Sejkora, Zdeněk Dolníček, and Radek Škoda
Eur. J. Mineral., 35, 703–714, https://doi.org/10.5194/ejm-35-703-2023, https://doi.org/10.5194/ejm-35-703-2023, 2023
Short summary
Short summary
Batoniite is a new mineral species belonging to the Al2O3–SO3–H2O ternary system, first found in the Cetine di Cotorniano Mine (Tuscany, Italy). This hydrated Al sulfate shows a novel crystal structure, characterized by Al octamers, so far reported in only synthetic compounds.
Cristian Biagioni, Ferdinando Bosi, Daniela Mauro, Henrik Skogby, Andrea Dini, and Federica Zaccarini
Eur. J. Mineral., 35, 81–94, https://doi.org/10.5194/ejm-35-81-2023, https://doi.org/10.5194/ejm-35-81-2023, 2023
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Dutrowite is the first tourmaline supergroup minerals having Ti as a species-defining chemical constituent. Its finding improves our knowledge on the crystal chemistry of this important mineral group and allows us to achieve a better picture of the mechanisms favouring the incorporation of Ti.
Cristian Biagioni, Marco E. Ciriotti, Georges Favreau, Daniela Mauro, and Federica Zaccarini
Eur. J. Mineral., 34, 365–374, https://doi.org/10.5194/ejm-34-365-2022, https://doi.org/10.5194/ejm-34-365-2022, 2022
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The paper reports the type description of the new mineral species graulichite-(La). This is a new addition to the dussertite group within the alunite supergroup, and its discovery improves our knowledge on the crystal chemistry of this important supergroup of minerals, having both technological and environmental applications.
Luboš Vrtiška, Jaromír Tvrdý, Jakub Plášil, Jiří Sejkora, Radek Škoda, Nikita V. Chukanov, Andreas Massanek, Jan Filip, Zdeněk Dolníček, and František Veselovský
Eur. J. Mineral., 34, 223–238, https://doi.org/10.5194/ejm-34-223-2022, https://doi.org/10.5194/ejm-34-223-2022, 2022
Short summary
Short summary
The study of the original material of beraunite from the type locality Hrbek, Czech Rep., from collections of the TU Bergakademie Freiberg (Germany) and National Museum Prague (Czech Republic) proved the identity of the minerals beraunite and eleonorite. Because the name beraunite has priority, we consider the name eleonorite to be redundant and proposed to abolish it. The proposal 21-D approved by the IMA discredited eleonorite and accepted the formula of beraunite Fe3+6(PO4)4O(OH)4·6H2O.
Daniela Mauro, Cristian Biagioni, and Federica Zaccarini
Eur. J. Mineral., 33, 717–726, https://doi.org/10.5194/ejm-33-717-2021, https://doi.org/10.5194/ejm-33-717-2021, 2021
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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.
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Short summary
Argentotennantite-(Fe), ideally Ag6(Cu4Fe2)As4S13, is a new member of the tetrahedrite group found in the San Genaro mine, Castrovirreyna Province, Huancavelica, Peru. It occurs as anhedral grains up to 100 μm in size, or, more commonly, it forms micrometer-sized rims around crystals of argentotetrahedrite-(Zn) or replaces the latter around cavities and fissures, along with Ag-rich tennantite-(Fe). It is cubic, I3m, with a = 10.4365(5) Å, V = 1136.75(17) Å3.
Argentotennantite-(Fe), ideally Ag6(Cu4Fe2)As4S13, is a new member of the tetrahedrite group...
