http://hdl.handle.net/20.500.12128/14588
Tytuł: | Crystal Chemistry of an Erythrite-Köttigite Solid Solution (Co3–xZnx) (AsO4)2·8H2O |
Autor: | Ciesielczuk, Justyna Dulski, Mateusz Janeczek, Janusz Krzykawski, Tomasz Kusz, Joachim Szełęg, Eligiusz |
Słowa kluczowe: | erythrite; köttigite; solid solution; arsenate series; vivianite-group minerals; structure refinement; Raman spectroscopy; Miedzianka |
Data wydania: | 2020 |
Źródło: | Minerals, Vol. 10 (2020), Art. No. 548 |
Abstrakt: | A wide compositional range, covering about 90% of an expected erythrite-köttigite substitutional solid solution with extreme compositions of (Co2.84Mg0.14Zn0.02) (AsO4)2·8H2O and (Zn2.74Co0.27) (AsO4)2·8H2O, was revealed in a suite of samples from a polymetallic ore deposit in Miedzianka, SW Poland. Members of the solid solution series were examined by means of Electron Probe Microanalysis (EPMA), Scanning Electron Microscopy (SEM)/Energy-Dispersive Spectrometer (EDS), X-ray single-crystal and powder diffraction, and Raman spectroscopy. Metal cations were randomly distributed between two special octahedral sites in the erythrite–köttigite structure. In response to Co ↔ Zn substitutions, small but significant changes in bond distances (particularly in [AsO4] tetrahedra), rotation, and distortion of co-ordination polyhedra were observed. Two sub-series of dominant cationic substitutions (Co-Mg-Ni and Co-Fe-Zn) were noted within the arsenate series of vivianite-group minerals linked by erythrite. The paragenetic sequence erythrite → Zn-rich erythrite → Co-rich köttigite → köttigite reflects the evolution of the solution’s pH towards increased acidity and a relative increase in the concentration of Zn ions following precipitation of erythrite. |
URI: | http://hdl.handle.net/20.500.12128/14588 |
DOI: | 10.3390/min10060548 |
ISSN: | 2075-163X |
Pojawia się w kolekcji: | Artykuły (WNP) |
Plik | Opis | Rozmiar | Format | |
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Ciesielczuk_Crystal_chemistry_of_an_Erythrite-Kottigite.pdf | 5,25 MB | Adobe PDF | Przejrzyj / Otwórz |
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