Crystal Chemistry of an Erythrite-Köttigite Solid Solution (Co3–xZnx) (AsO4)2·8H2O

A wide compositional range, covering about 90% of an expected erythrite-köttigite substitutional solid solution with extreme compositions of (Co2.84Mg0.14Zn0.02) (AsO4)2·8H2&...

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Main Authors:	Justyna Ciesielczuk, Mateusz Dulski, Janusz Janeczek, Tomasz Krzykawski, Joachim Kusz, Eligiusz Szełęg
Format:	Article
Language:	English
Published:	MDPI AG 2020-06-01
Series:	Minerals
Subjects:	erythrite köttigite solid solution arsenate series vivianite-group minerals structure refinement
Online Access:	https://www.mdpi.com/2075-163X/10/6/548

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spelling	doaj-680c321eec904956bd6a673200a1be072020-11-25T04:02:41ZengMDPI AGMinerals2075-163X2020-06-011054854810.3390/min10060548Crystal Chemistry of an Erythrite-Köttigite Solid Solution (Co<sub>3–x</sub>Zn<sub>x</sub>) (AsO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>OJustyna Ciesielczuk0Mateusz Dulski1Janusz Janeczek2Tomasz Krzykawski3Joachim Kusz4Eligiusz Szełęg5Institute of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, PolandInstitute of Materials Engineering, University of Silesia, 75 Pułku Piechoty 1a, 41-500 Chorzów, PolandInstitute of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, PolandInstitute of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, PolandInstitute of Physics, University of Silesia, 75 Pułku Piechoty 1, 41-500 Chorzów, PolandInstitute of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, PolandA wide compositional range, covering about 90% of an expected erythrite-köttigite substitutional solid solution with extreme compositions of (Co<sub>2.84</sub>Mg<sub>0.14</sub>Zn<sub>0.02</sub>) (AsO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O and (Zn<sub>2.74</sub>Co<sub>0.27</sub>) (AsO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O, 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 [AsO<sub>4</sub>] 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.https://www.mdpi.com/2075-163X/10/6/548erythriteköttigitesolid solutionarsenate seriesvivianite-group mineralsstructure refinement
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Justyna Ciesielczuk Mateusz Dulski Janusz Janeczek Tomasz Krzykawski Joachim Kusz Eligiusz Szełęg
spellingShingle	Justyna Ciesielczuk Mateusz Dulski Janusz Janeczek Tomasz Krzykawski Joachim Kusz Eligiusz Szełęg Crystal Chemistry of an Erythrite-Köttigite Solid Solution (Co<sub>3–x</sub>Zn<sub>x</sub>) (AsO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O Minerals erythrite köttigite solid solution arsenate series vivianite-group minerals structure refinement
author_facet	Justyna Ciesielczuk Mateusz Dulski Janusz Janeczek Tomasz Krzykawski Joachim Kusz Eligiusz Szełęg
author_sort	Justyna Ciesielczuk
title	Crystal Chemistry of an Erythrite-Köttigite Solid Solution (Co<sub>3–x</sub>Zn<sub>x</sub>) (AsO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O
title_short	Crystal Chemistry of an Erythrite-Köttigite Solid Solution (Co<sub>3–x</sub>Zn<sub>x</sub>) (AsO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O
title_full	Crystal Chemistry of an Erythrite-Köttigite Solid Solution (Co<sub>3–x</sub>Zn<sub>x</sub>) (AsO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O
title_fullStr	Crystal Chemistry of an Erythrite-Köttigite Solid Solution (Co<sub>3–x</sub>Zn<sub>x</sub>) (AsO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O
title_full_unstemmed	Crystal Chemistry of an Erythrite-Köttigite Solid Solution (Co<sub>3–x</sub>Zn<sub>x</sub>) (AsO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O
title_sort	crystal chemistry of an erythrite-köttigite solid solution (co<sub>3–x</sub>zn<sub>x</sub>) (aso<sub>4</sub>)<sub>2</sub>·8h<sub>2</sub>o
publisher	MDPI AG
series	Minerals
issn	2075-163X
publishDate	2020-06-01
description	A wide compositional range, covering about 90% of an expected erythrite-köttigite substitutional solid solution with extreme compositions of (Co<sub>2.84</sub>Mg<sub>0.14</sub>Zn<sub>0.02</sub>) (AsO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O and (Zn<sub>2.74</sub>Co<sub>0.27</sub>) (AsO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O, 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 [AsO<sub>4</sub>] 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.
topic	erythrite köttigite solid solution arsenate series vivianite-group minerals structure refinement
url	https://www.mdpi.com/2075-163X/10/6/548
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Crystal Chemistry of an Erythrite-Köttigite Solid Solution (Co<sub>3–x</sub>Zn<sub>x</sub>) (AsO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O

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