Research article
11 May 2020
Research article
| 11 May 2020
Thermodynamic properties, crystal structure and phase relations of pushcharovskite [Cu(AsO3OH)(H2O) ⋅ 0.5H2O], geminite [Cu(AsO3OH)(H2O)] and liroconite [Cu2Al(AsO4)(OH)4 ⋅ 4H2O]
Alexandra M. Plumhoff et al.
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Stannite decomposition leads to the precipitation of an amorphous and metastable Sn–Fe–As-rich phase. With ageing, goethite and cassiterite crystallize from the precursor and mark the end of the weathering cycle. Other elements are lost in the initial stage of weathering (e.g. Zn, S) or after full oxidation of the sulfidic material (e.g. Cu, Ag). Electron microprobe (EMP) and transmission electron microscopy (TEM) analyses were performed to witness the mobility of the released elements.
Luboš Vrtiška, Jaromír Tvrdý, Jakub Plášil, Jiří Sejkora, Radek Škoda, Nikita V. Chukanov, Andreas Massanek, Jan Filip, Zdeněk Dolníček, and František Veselovský
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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.
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Chapmanite is a seemingly rare mineral, a silicate of the elements iron and antimony. In this work, we evaluated how stable and how soluble this mineral is. The goal was to determine if this mineral can store the toxic element antimony. Our results show that it is possible, but its formation in nature is hindered and slow. Yet, in some special environments, it could store and keep antimony over longer time.
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Grimmite, sulfide of cobalt and nickel, is the new mineral for the mineralogical system.
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Luxembourgite, ideally AgCuPbBi4Se8, is a new selenide discovered at Bivels, Grand Duchy of Luxembourg. The mineral forms tiny fibres deposited on dolomite crystals. Its crystal structure is similar to those of litochlebite and watkinsonite, and can be described as an alternation of two types of anionic layers: a pseudotetragonal layer four atoms thick and a pseudohexagonal layer one atom thick. The species named for the city of Luxembourg, close to its locality of discovery.
Aileen Meier, Anne Kastner, Dennis Harries, Maria Wierzbicka-Wieczorek, Juraj Majzlan, Georg Büchel, and Erika Kothe
Biogeosciences, 14, 4867–4878, https://doi.org/10.5194/bg-14-4867-2017, https://doi.org/10.5194/bg-14-4867-2017, 2017
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Biomineralization of (magnesium) calcite and vaterite by bacterial isolates was observed using isolates from limestone associated groundwater, rock and soil. More than 92 % of isolates could form carbonates with different crystal macromorphologies. Using different conditions like varying temperature, pH or media components but also cocultivation to test for collaborative effects of sympatric bacteria, mechanisms of calcium carbonate formation were studied.
E. Schütze, A. Weist, M. Klose, T. Wach, M. Schumann, S. Nietzsche, D. Merten, J. Baumert, J. Majzlan, and E. Kothe
Biogeosciences, 10, 3605–3614, https://doi.org/10.5194/bg-10-3605-2013, https://doi.org/10.5194/bg-10-3605-2013, 2013
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Firing and post-firing dynamics of Mg- and Ca-rich bricks used in the built heritage of the city of Padua (northeastern Italy)
A case study of zeolitization process: “Tufo Rosso a Scorie Nere” (Vico volcano, Italy): inferences for a general model
On the anomalous shapes of native copper crystals from the Michigan Copper Country
Elena Mercedes Pérez-Monserrat, Lara Maritan, and Giuseppe Cultrone
Eur. J. Mineral., 34, 301–319, https://doi.org/10.5194/ejm-34-301-2022, https://doi.org/10.5194/ejm-34-301-2022, 2022
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A very representative type of historic brick, made of Mg- and Ca-rich illitic clays fired at high temperatures and used in the city of Padua, was studied. The mineral phases formed during the firing and the processes that took place after firing have enhanced the durability of the bricks, so the data obtained may be significant to the current ceramic industry. This study was framed within the CLAYONRISK project (MSCA-IF-2018) and was performed based on archeometric methodologies.
Daniela Novembre, Domingo Gimeno, Piergiulio Cappelletti, and Sossio Fabio Graziano
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Zeolites are used in several technological applications. Knowledge of their genetic mechanisms in geological deposits can help to understand the type of zeolite forming in specific conditions and their sector of possible use. The pyroclastic deposit
Tufo Rosso a Scorie Nere(Vico volcano, Latium, Italy) exhibits intense zeolitization processes at chabazite and phillipsite. This abundant presence makes the deposit worthy of being considered for possible exploitation.
Jean-Claude Boulliard, Jérôme Aléon, and Eloïse Gaillou
Eur. J. Mineral., 33, 9–21, https://doi.org/10.5194/ejm-33-9-2021, https://doi.org/10.5194/ejm-33-9-2021, 2021
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The anomalous shapes of Michigan copper crystals are well known by mineral collectors and are curated in museums worldwide. Still, their particular habits remain enigmatic. These anomalous crystals do not seem to follow the standard crystal shape theories, maybe due to the presence of oxygen impurities. This new find is of great importance in shape-dependent catalysis, sensor characteristics, or other properties of material such as nanocrystals.
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