Articles | Volume 32, issue 6
https://doi.org/10.5194/ejm-32-623-2020
© Author(s) 2020. 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-32-623-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
14 Nov 2020
Research article |
| 14 Nov 2020
| 14 Nov 2020
Contribution to the crystal chemistry of lead-antimony sulfosalts: systematic Pb-versus-Sb crossed substitution in the plagionite homologous series, Pb2N − 1(Pb1 − xSbx)2(Sb1 − xPbx)2Sb6S13+2N
Yves Moëlo
CORRESPONDING AUTHOR
Institut des Matériaux Jean Rouxel (IMN) – UMR 6502, Université de Nantes, CNRS, 44000 Nantes, France
Cristian Biagioni
Dipartimento di Scienze della Terra, Università di Pisa, Via S.
Maria 53, 56126 Pisa, Italy
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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
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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.
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Pyrite crystals with rhombohedral morphology have been known for a long time and were considered up to now as curiosities. The morphological study of well-crystallized, centimeter-sized crystals, often twinned, from the Madan Pb–Zn ore field permitted us to define such a pyrite variety as a pseudo-cubic trigonal derivative of pyrite.
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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
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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.
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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
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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.
Cristian Biagioni, Anatoly V. Kasatkin, Fabrizio Nestola, Radek Škoda, Vladislav V. Gurzhiy, Atali A. Agakhanov, and Natalia N. Koshlyakova
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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.
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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.
Yves Moëlo
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Chrysoberyl from the Sabatini Volcanic Complex (Latium, Italy): chemical and petrological peculiarities
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Giuseppe Illuminati, Silvia Musetti, Fabio Bellatreccia, Cristian Biagioni, Enrico Caprilli, Ahmad Rabiee, and Marco E. Ciriotti
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Quentin Bollaert, Mathieu Chassé, Guillaume Morin, Benoît Baptiste, Alexandra Courtin, Laurence Galoisy, Gautier Landrot, Cécile Quantin, and Georges Calas
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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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Yanjuan Wang, Fabrizio Nestola, Zengqian Hou, Xiangping Gu, Guochen Dong, Zhusen Yang, Guang Fan, Zhibin Xiao, and Kai Qu
Eur. J. Mineral., 35, 65–74, https://doi.org/10.5194/ejm-35-65-2023, https://doi.org/10.5194/ejm-35-65-2023, 2023
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Bobtraillite is an extremely rare cyclosilicate with a unique composition and complex structure. In this paper, we describe the second occurrence of the extremely rare complex zirconium silicate. The results suggest that the ideal formula of bobtraillite could be written as (Na, □)12(□, Na)12Sr12Zr14(Si3O9)10[Si2BO7(OH)2]6·12H2O.
Shiyun Jin, Ziyin Sun, and Aaron C. Palke
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The inclusions and exsolution lamellae in rainbow lattice sunstone (RLS) are studied using microscopic observations, chemical analyses and single-crystal X-ray diffraction. Complicated processes producing the aventurescence and adularescence effect in RLS are revealed through the spatial relationship among the inclusions and exsolution lamellae, as well as the unique ordering pattern in the feldspar structures.
Jordi Rius, Fernando Colombo, Oriol Vallcorba, Xavier Torrelles, Mauro Gemmi, and Enrico Mugnaioli
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The crystal structure of the mineral decrespignyite-(Y) from the Paratoo copper mine (South Australia) has been obtained by applying δ recycling direct methods to 3D electron diffraction data followed by Rietveld refinements of synchrotron powder diffraction data. Its structure mainly shows a metal layer sequence of polyhedra interconnecting hexanuclear (octahedral) oxo-hydroxo yttrium clusters along a ternary axis or tilted clusters to hetero-tetranuclear ones hosting Cu, Y and rare earths.
Stephan Lenz, Johannes Birkenstock, Lennart A. Fischer, Hartmut Schneider, and Reinhard X. Fischer
Eur. J. Mineral., 32, 235–249, https://doi.org/10.5194/ejm-32-235-2020, https://doi.org/10.5194/ejm-32-235-2020, 2020
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A mineral from Ettringer Bellerberg (Eifel, Germany) proved to be a polytype of the important ceramic-phase mullite termed mullite-2c, with – similar to sillimanite – doubling of the c lattice parameter due to strong (Si,Al) order in tetrahedral diclusters and – similar to mullite – presence of oxygen vacancies and tetrahedral triclusters due to Al / Si > 1 in diclusters. Crystals were characterised using single-crystal XRD, electron microprobe
analysis (EMPA) and spindle-stage optical methods.
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Short summary
The plagionite group is a family of complex sulfides (
lead-antimony sulfosalts) encountered in various Pb-Cu-Zn ore deposits. Analysis of these crystal structures confirms a systematic Pb-versus-Sb substitution in two adjacent cation positions. Such a substitution varies according not only to the Pb / Sb ratio of each member but also, apparently, to the kinetics of crystallization. Re-examination of a Pb-free synthetic derivative permitted its redefinition as a Na-Sb sulfosalt.
The plagionite group is a family of complex sulfides (
lead-antimony sulfosalts) encountered in...
