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

I. V. Pekov; Пеков И. В.; N. V. Zubkova; Зубкова Н. В.; A. A. Agakhanov; Агаханов А. А.; A. G. Turchkova; Турчкова А. Г.; E. S. Zhitova; Житова Е. С.; D. Yu. Pushcharovsky; Пущаровский Д. Ю.

doi:10.31857/S2686739723601485

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
Affiliations:
1. Lomonosov Moscow State University, Faculty of Geology
2. Fersman Mineralogical Museum of the Russian Academy of Sciences
3. 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://ruspoj.com/2686-7397/article/view/649811
DOI: https://doi.org/10.31857/S2686739723601485
EDN: https://elibrary.ru/WHMDIJ
ID: 649811

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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(Na_{0.56 $◻$ 0.44}) $_{2}^{M 21}$ (Na_0.81Ca_0.19) $_{2}^{M 31}$ (Na_{0.97 $◻$ 0.03}) $_{6}^{M 12}$ (Ca_0.64Na_0.36) $_{6}^{M 1}$ Mn^M2(Mg_0.54Ca_0.46)^M3–9Mg $_{30}^{M 10}$ (Mg_0.94Ca_0.06) $_{6}^{M 11}$ Mg₆(P_33.53As_2.47)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.

Keywords

chladniite, fillowite group, phosphate, crystal structure, fumarolic sublimates, Tolbachik volcano

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