A NEW VARIETY OF CHLADNIITE FROM VOLCANIC EXHALATIONS. GENETIC CRYSTAL CHEMISTRY OF CHLADNIITE

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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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Copyright (c) 2023 И.В. Пеков, Н.В. Зубкова, А.А. Агаханов, А.Г. Турчкова, Е.С. Житова, Д.Ю. Пущаровский