A NEW VARIETY OF CHLADNIITE FROM VOLCANIC EXHALATIONS. GENETIC CRYSTAL CHEMISTRY OF CHLADNIITE
- Authors: Pekov I.V.1, Zubkova N.V.1, Agakhanov A.A.2, Turchkova A.G.1, Zhitova E.S.3, Pushcharovsky D.Y.1
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Affiliations:
- Lomonosov Moscow State University, Faculty of Geology
- Fersman Mineralogical Museum of the Russian Academy of Sciences
- Institute of Volcanology and Seismology, Far Eastern Branch of Russian Academy of Sciences
- Issue: Vol 512, No 2 (2023)
- Pages: 233-241
- Section: MINERALOGY
- Submitted: 30.01.2025
- Published: 01.10.2023
- URL: https://edgccjournal.org/2686-7397/article/view/649811
- DOI: https://doi.org/10.31857/S2686739723601485
- EDN: https://elibrary.ru/WHMDIJ
- ID: 649811
Cite item
Abstract
A new, unusual Fe-free and As5+-enriched variety of chladniite, a rare phosphate of the fillowite group was found in exhalations of the active Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. It belongs to the high-temperature (500–750°С) paragenesis with calciojohillerite, fluorapatite, metathénardite, diopside, enstatite, forsterite and hematite. This genetic type is novel for fillowite-group minerals. The crystal structure of Tolbachik chladniite is solved, R1 = 4.32%. It is trigonal, R–3, a = 14.9831(2), c = 42.8050(7) Å, V = 8322.1(3) Å3. The structural formula is: M13(Na0.56\(\square \)0.44)\(_{2}^{{M21}}\)(Na0.81Ca0.19)\(_{2}^{{M31}}\) (Na0.97\(\square \)0.03)\(_{6}^{{M12}}\)(Ca0.64Na0.36)\(_{6}^{{M1}}\)MnM2(Mg0.54Ca0.46)M3–9Mg\(_{{30}}^{{M10}}\)(Mg0.94Ca0.06)\(_{6}^{{M11}}\)Mg6(P33.53As2.47)O144 (Z = 3). The crystal chemical features of chladniite and their correlation with mode of occurrence are discussed for all chladniite findings known in meteorites and terrestrial objects of different genetic types.
About the authors
I. V. Pekov
Lomonosov Moscow State University, Faculty of Geology
Author for correspondence.
Email: igorpekov@mail.ru
Russian, Moscow
N. V. Zubkova
Lomonosov Moscow State University, Faculty of Geology
Email: igorpekov@mail.ru
Russian, Moscow
A. A. Agakhanov
Fersman Mineralogical Museum of the Russian Academy of Sciences
Email: igorpekov@mail.ru
Russian, Moscow
A. G. Turchkova
Lomonosov Moscow State University, Faculty of Geology
Email: igorpekov@mail.ru
Russian, Moscow
E. S. Zhitova
Institute of Volcanology and Seismology, Far Eastern Branch of Russian Academy of Sciences
Email: igorpekov@mail.ru
Russian,
Petropavlovsk-Kamchatsky
D. Yu. Pushcharovsky
Lomonosov Moscow State University, Faculty of Geology
Email: igorpekov@mail.ru
Russian, Moscow
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