The Crystal Chemistry of Voltaite-Group Minerals from Post-Volcanic and Anthropogenic Occurrences
Five samples of voltaite-group minerals from post-volcanic occurrences (geothermal fields and solfatara at pyroclastic flow) and from pseudofumaroles born by coal fires are characterized by single-crystal X-ray diffraction, scanning electron microscopy and electron microprobe analysis. The studied m...
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2023-11-01
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| author | Elena S. Zhitova Rezeda M. Sheveleva Anastasia N. Kupchinenko Andrey A. Zolotarev Igor V. Pekov Anton A. Nuzhdaev Vesta O. Davydova Natalia S. Vlasenko Ekaterina Y. Plutakhina Vasiliy O. Yapaskurt Peter E. Schweigert Tatiana F. Semenova |
| author_facet | Elena S. Zhitova Rezeda M. Sheveleva Anastasia N. Kupchinenko Andrey A. Zolotarev Igor V. Pekov Anton A. Nuzhdaev Vesta O. Davydova Natalia S. Vlasenko Ekaterina Y. Plutakhina Vasiliy O. Yapaskurt Peter E. Schweigert Tatiana F. Semenova |
| author_sort | Elena S. Zhitova |
| collection | DOAJ |
| description | Five samples of voltaite-group minerals from post-volcanic occurrences (geothermal fields and solfatara at pyroclastic flow) and from pseudofumaroles born by coal fires are characterized by single-crystal X-ray diffraction, scanning electron microscopy and electron microprobe analysis. The studied minerals include ammoniomagnesiovoltaite, ammoniovoltaite, voltaite and magnesiovoltaite. The quadrilateral of chemical compositions is determined by monovalent cations such as (NH<sub>4</sub>)<sup>+</sup> and K<sup>+</sup> and divalent cations such as Fe<sup>2+</sup> and Mg<sup>2+</sup>. Minor Al can occur in the Fe<sup>3+</sup> site. Minor amounts of P, V can occur in the S site. Ammonium members are described from geothermal fields, expanding the mineral potential of this type of geological environment. All minerals are cubic, space group <i>Fd</i>-3<i>c</i>, <i>a</i> = 27.18–27.29 Å, <i>V</i> = 20079–20331 Å<sup>3</sup>, <i>Z</i> = 16. No clear evidence of symmetry lowering (suggested for synthetic voltaites) is observed despite the chemical variation in the studied samples. Ammonium species tend to have a larger <i>a</i> lattice parameter than potassium ones due to longer <<i>A</i>–O> distances (<i>A</i> = N or K). The systematically shorter <<i>Me</i><sup>2+</sup>–ϕ><sub>obs</sub> (<i>Me</i><sup>2+</sup> = Fe, Mg; ϕ = O, H<sub>2</sub>O) in comparison to <<i>Me</i><sup>2+</sup>–ϕ><sub>calc</sub> bond lengths can be explained as a consequence of mean bond length variation due to significant bond length distortion in <i>Me</i><sup>2+</sup>ϕ<sub>6</sub> octahedra <i>Me</i>2–O2—2.039–2.055 Å; <i>Me</i>2–O4—2.085–2.115 Å; and <i>Me</i>2–Ow5—2.046–2.061 Å, with bond length distortion estimated as from 0.008 to 0.014 for different samples. |
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| spelling | doaj.art-dc9fa098890c421599068199662bfec22023-12-22T14:45:08ZengMDPI AGSymmetry2073-89942023-11-011512212610.3390/sym15122126The Crystal Chemistry of Voltaite-Group Minerals from Post-Volcanic and Anthropogenic OccurrencesElena S. Zhitova0Rezeda M. Sheveleva1Anastasia N. Kupchinenko2Andrey A. Zolotarev3Igor V. Pekov4Anton A. Nuzhdaev5Vesta O. Davydova6Natalia S. Vlasenko7Ekaterina Y. Plutakhina8Vasiliy O. Yapaskurt9Peter E. Schweigert10Tatiana F. Semenova11Institute of Volcanology and Seismology, Far East Branch of Russian Academy of Sciences, Piip Blvd. 9, 683006 Petropavlovsk-Kamchatsky, RussiaInstitute of Volcanology and Seismology, Far East Branch of Russian Academy of Sciences, Piip Blvd. 9, 683006 Petropavlovsk-Kamchatsky, RussiaInstitute of Volcanology and Seismology, Far East Branch of Russian Academy of Sciences, Piip Blvd. 9, 683006 Petropavlovsk-Kamchatsky, RussiaSaint-Petersburg State University, University Embankment, 7/9, 199034 Saint-Petersburg, RussiaFaculty of Geology, Moscow State University, Leninskie Gory, 1, 119991 Moscow, RussiaInstitute of Volcanology and Seismology, Far East Branch of Russian Academy of Sciences, Piip Blvd. 9, 683006 Petropavlovsk-Kamchatsky, RussiaFaculty of Geology, Moscow State University, Leninskie Gory, 1, 119991 Moscow, RussiaSaint-Petersburg State University, University Embankment, 7/9, 199034 Saint-Petersburg, RussiaInstitute of Volcanology and Seismology, Far East Branch of Russian Academy of Sciences, Piip Blvd. 9, 683006 Petropavlovsk-Kamchatsky, RussiaFaculty of Geology, Moscow State University, Leninskie Gory, 1, 119991 Moscow, RussiaInstitute of Volcanology and Seismology, Far East Branch of Russian Academy of Sciences, Piip Blvd. 9, 683006 Petropavlovsk-Kamchatsky, RussiaSaint-Petersburg State University, University Embankment, 7/9, 199034 Saint-Petersburg, RussiaFive samples of voltaite-group minerals from post-volcanic occurrences (geothermal fields and solfatara at pyroclastic flow) and from pseudofumaroles born by coal fires are characterized by single-crystal X-ray diffraction, scanning electron microscopy and electron microprobe analysis. The studied minerals include ammoniomagnesiovoltaite, ammoniovoltaite, voltaite and magnesiovoltaite. The quadrilateral of chemical compositions is determined by monovalent cations such as (NH<sub>4</sub>)<sup>+</sup> and K<sup>+</sup> and divalent cations such as Fe<sup>2+</sup> and Mg<sup>2+</sup>. Minor Al can occur in the Fe<sup>3+</sup> site. Minor amounts of P, V can occur in the S site. Ammonium members are described from geothermal fields, expanding the mineral potential of this type of geological environment. All minerals are cubic, space group <i>Fd</i>-3<i>c</i>, <i>a</i> = 27.18–27.29 Å, <i>V</i> = 20079–20331 Å<sup>3</sup>, <i>Z</i> = 16. No clear evidence of symmetry lowering (suggested for synthetic voltaites) is observed despite the chemical variation in the studied samples. Ammonium species tend to have a larger <i>a</i> lattice parameter than potassium ones due to longer <<i>A</i>–O> distances (<i>A</i> = N or K). The systematically shorter <<i>Me</i><sup>2+</sup>–ϕ><sub>obs</sub> (<i>Me</i><sup>2+</sup> = Fe, Mg; ϕ = O, H<sub>2</sub>O) in comparison to <<i>Me</i><sup>2+</sup>–ϕ><sub>calc</sub> bond lengths can be explained as a consequence of mean bond length variation due to significant bond length distortion in <i>Me</i><sup>2+</sup>ϕ<sub>6</sub> octahedra <i>Me</i>2–O2—2.039–2.055 Å; <i>Me</i>2–O4—2.085–2.115 Å; and <i>Me</i>2–Ow5—2.046–2.061 Å, with bond length distortion estimated as from 0.008 to 0.014 for different samples.https://www.mdpi.com/2073-8994/15/12/2126voltaitemagnesiovoltaiteammoniovoltaiteammoniomagnesiovoltaitevolcanofumarole |
| spellingShingle | Elena S. Zhitova Rezeda M. Sheveleva Anastasia N. Kupchinenko Andrey A. Zolotarev Igor V. Pekov Anton A. Nuzhdaev Vesta O. Davydova Natalia S. Vlasenko Ekaterina Y. Plutakhina Vasiliy O. Yapaskurt Peter E. Schweigert Tatiana F. Semenova The Crystal Chemistry of Voltaite-Group Minerals from Post-Volcanic and Anthropogenic Occurrences Symmetry voltaite magnesiovoltaite ammoniovoltaite ammoniomagnesiovoltaite volcano fumarole |
| title | The Crystal Chemistry of Voltaite-Group Minerals from Post-Volcanic and Anthropogenic Occurrences |
| title_full | The Crystal Chemistry of Voltaite-Group Minerals from Post-Volcanic and Anthropogenic Occurrences |
| title_fullStr | The Crystal Chemistry of Voltaite-Group Minerals from Post-Volcanic and Anthropogenic Occurrences |
| title_full_unstemmed | The Crystal Chemistry of Voltaite-Group Minerals from Post-Volcanic and Anthropogenic Occurrences |
| title_short | The Crystal Chemistry of Voltaite-Group Minerals from Post-Volcanic and Anthropogenic Occurrences |
| title_sort | crystal chemistry of voltaite group minerals from post volcanic and anthropogenic occurrences |
| topic | voltaite magnesiovoltaite ammoniovoltaite ammoniomagnesiovoltaite volcano fumarole |
| url | https://www.mdpi.com/2073-8994/15/12/2126 |
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