Articles | Volume 36, issue 1
https://doi.org/10.5194/ejm-36-1-2024
© Author(s) 2024. 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-36-1-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Structural and compositional data for childrenite from the Homolka granite, Czech Republic
Jonas Toupal
CORRESPONDING AUTHOR
Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA 19104-6316, USA
Daniela Mauro
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy
Museo di Storia Naturale, Università di Pisa, Via Roma 79, 56011 Calci (PI), Italy
Cristian Biagioni
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy
Centro per l'Integrazione della Strumentazione scientifica dell'Università di Pisa, Pisa, Italy
Federica Zaccarini
Geosciences Programme, Faculty of Science, University Brunei Darussalam, Jalan Tungku Link, Gadong, Bandar Seri Begawan BE1410, Brunei
Reto Gieré
Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA 19104-6316, USA
Center of Excellence in Environmental Toxicology, University of Pennsylvania, Philadelphia, PA 19104-6316, USA
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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
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.
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
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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
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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.
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.
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.
Ruggero Vigliaturo, Sabrina M. Elkassas, Giancarlo Della Ventura, Günther J. Redhammer, Francisco Ruiz-Zepeda, Michael J. O'Shea, Goran Dražić, and Reto Gieré
Eur. J. Mineral., 33, 77–112, https://doi.org/10.5194/ejm-33-77-2021, https://doi.org/10.5194/ejm-33-77-2021, 2021
Yves Moëlo and Cristian Biagioni
Eur. J. Mineral., 32, 623–635, https://doi.org/10.5194/ejm-32-623-2020, https://doi.org/10.5194/ejm-32-623-2020, 2020
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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.
Related subject area
X-ray and mineral structure
Crystal chemistry of K-tourmalines from the Kumdy-Kol microdiamond deposit, Kokchetav Massif, Kazakhstan
Atomic-scale environment of niobium in ore minerals as revealed by XANES and EXAFS at the Nb K-edge
Bobtraillite from Gejiu hyperagpaitic nepheline syenite, southwestern China: new occurrence and crystal structure
Iron oxide inclusions and exsolution textures of rainbow lattice sunstone
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
Structural study of decrespignyite-(Y), a complex yttrium rare earth copper carbonate chloride, by three-dimensional electron and synchrotron powder diffraction
Mullite-2c – a natural polytype of mullite
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.
Quentin Bollaert, Mathieu Chassé, Guillaume Morin, Benoît Baptiste, Alexandra Courtin, Laurence Galoisy, Gautier Landrot, Cécile Quantin, and Georges Calas
Eur. J. Mineral., 36, 55–72, https://doi.org/10.5194/ejm-36-55-2024, https://doi.org/10.5194/ejm-36-55-2024, 2024
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X-ray absorption spectroscopy (XAS) was successfully used to investigate the atomic-scale environment of niobium (Nb) in ore minerals and Nb-doped compounds of technological importance. The demonstrated sensitivity of this technique to Nb minerals could help decipher Nb speciation in mining contexts such as hydrothermal and lateritic deposits and rationalize the origin of the enhanced physico-chemical properties of Nb-doped materials.
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
Eur. J. Mineral., 34, 183–200, https://doi.org/10.5194/ejm-34-183-2022, https://doi.org/10.5194/ejm-34-183-2022, 2022
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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.
Yves Moëlo and Cristian Biagioni
Eur. J. Mineral., 32, 623–635, https://doi.org/10.5194/ejm-32-623-2020, https://doi.org/10.5194/ejm-32-623-2020, 2020
Short summary
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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.
Jordi Rius, Fernando Colombo, Oriol Vallcorba, Xavier Torrelles, Mauro Gemmi, and Enrico Mugnaioli
Eur. J. Mineral., 32, 545–555, https://doi.org/10.5194/ejm-32-545-2020, https://doi.org/10.5194/ejm-32-545-2020, 2020
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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
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.
In this work, we refine the crystal structure of childrenite. Additionally, we provide...