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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Morgenroth, Wolfgang
University of Potsdam
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (7/7 displayed)
- 2021Pt$_2$AuCuNiSn, a new noble metal single-phase high entropy alloycitations
- 2020A portable on-axis laser-heating system for near-90° X-ray spectroscopy: application to ferropericlase and iron silicidecitations
- 2020Phase stabilities of MgCO$_{3}$ and MgCO$_{3}$-II studied by Raman spectroscopy, x-ray diffraction, and density functional theory calculationscitations
- 2020A portable on-axis laser-heating system for near-90 degrees X-ray spectroscopy: application to ferropericlase and iron silicidecitations
- 2019Ognitite, NiBiTe, a new mineral species, and Co-rich maucherite from the Ognit ultramafic complex, Eastern Sayans, Russiacitations
- 2014Compression Behavior of $Sm_{2}Ti_{2}O_{7}$-Pyrochlore up to 50 GPa: Single-Crystal X-ray Diffraction and Density Functional Theory Calculationscitations
- 2013Transformation and structure of silicatelike $CO_{2}-V$citations
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article
Ognitite, NiBiTe, a new mineral species, and Co-rich maucherite from the Ognit ultramafic complex, Eastern Sayans, Russia
Abstract
<jats:title>Abstract</jats:title><jats:p>We describe the new species ognitite, NiBiTe, and a Co-rich variety of maucherite, hitherto unreported; both were discovered in the Ognit ultramafic complex of Neoproterozoic age in Eastern Sayans, Russia. The mean composition of ognitite (<jats:italic>n</jats:italic> = 7) is: Ni 17.05, Fe 0.07, Cu 0.14, Pd 0.14, Te 32.53, Bi 49.64, total 99.57 wt.%, corresponding to: (Ni<jats:sub>1.11</jats:sub>Cu<jats:sub>0.008</jats:sub>Fe<jats:sub>0.005</jats:sub>Pd<jats:sub>0.005</jats:sub>)<jats:sub>Σ1.13</jats:sub>Bi<jats:sub>0.90</jats:sub>Te<jats:sub>0.97</jats:sub> (Σ atoms = 3 apfu). Ognitite is trigonal, space group <jats:italic>P</jats:italic>3<jats:italic>m</jats:italic>1 [<jats:italic>R</jats:italic><jats:sub>1</jats:sub> = 0.0276 for 81 reflections with <jats:italic>F</jats:italic><jats:sub>o</jats:sub> > 4σ(<jats:italic>F</jats:italic><jats:sub>o</jats:sub>)]. The unit-cell parameters derived from the single-crystal X-ray diffraction data are: <jats:italic>a</jats:italic> = 3.928(1) Å, <jats:italic>c</jats:italic> = 5.385(1) Å and <jats:italic>V</jats:italic> = 71.95(4) Å<jats:sup>3</jats:sup>, with Z = 1. The <jats:italic>c</jats:italic>:<jats:italic>a</jats:italic> ratio is 1.37. The powder X-ray diffraction data obtained on the same fragment used for the single-crystal study are: <jats:italic>a</jats:italic> = 3.9332(4) Å, <jats:italic>c</jats:italic> = 5.3920(6) Å and <jats:italic>V</jats:italic> = 72.24(1) Å<jats:sup>3</jats:sup>. Ognitite exhibits the brucite-type structure with edge-sharing NiTe<jats:sub>3</jats:sub>Bi<jats:sub>3</jats:sub> octahedra forming sheets parallel to (0001). It is related to melonite, but is distinct compositionally by the extreme Bi-enrichment (melonite and its synthetic analogue contain <0.4 Bi apfu), and structurally as Bi and Te are ordered at two distinct sites, leading to the loss of the centre of symmetry in ognitite.</jats:p><jats:p>At more than 9 wt.% Co, or ~2 apfu Co, the core of Co-rich maucherite [(Ni,Co)<jats:sub>11</jats:sub>As<jats:sub>8</jats:sub>] in a zoned crystal, which is surrounded by Co-depleted orcelite, far surpasses the norm (≤1 and up to 3.9 wt.% Co). The unit-cell parameters of the Co-rich maucherite are: <jats:italic>a</jats:italic> = 6.85(2) and <jats:italic>c</jats:italic> = 21.83(5) Å, which are based on results of synchrotron micro-Laue diffraction.</jats:p><jats:p>The host rock consists of serpentine, clinochlore (Mg# 95–97) and skeletal chromite. We favour the metastable crystallisation of fluid-saturated globules of a sulfide–arsenide melt to explain the anomalous compositions of ore minerals at Ognit. These anomalies seem consistent with rapid cooling in a fluid-enriched system, possibly related to late-stage degassing of the magma, as reflected in a prominent metasomatic aureole at the contact with the enclosing gneissic rocks.</jats:p>