Chabazite-Ca and chabazite-K are found in specimens from the Mariinskoe (Malyshevskoe) deposit (Ural Emerald mines). They form lenticular twins up to 1–2 mm on prehnite. Both zeolites are characterized by an atypically high Cs content: up to 1.20 wt. % Cs2O (0.10 apfu Cs) in chabazite-Ca and up to 0.75 wt. % Cs2O (0.05 apfu Cs) in chabazite-K. In contrast to chabazite-K, chabazite-Ca also contains Sr: up to 1.50 wt. % SrO = 0.15 apfu Sr. Averaged formula is (Ca1.16K0.51Mg0.21Na0.16Sr0.08Cs0.06)(Al3.71Si8.31)O24·11.9H2O for chabazite-Ca (n = 30) and (K1.21Ca0.97Na0.26Mg0.12Cs0.04)(Al3.63Si8.36)O24·12.1H2O for chabazite-K (n = 15). Infrared spectra, X-ray powder diffraction data and calculated unit cell parameters of both minerals are in good agreement with published data for chabazite. Our finding of Cs-bearing chabazite from the Ural Emerald mines is the first in the Urals and likely the second in Russia.
Keywords: chabazite, zeolite, cesium, Mariinskoe deposit, Malyshevskoe deposit, Ural Emerald mines
Funding. This work was supported by the Russian Science Foundation, project no. 24-27-00225.
Acknowledgements. We are grateful to I.V. Pekov and L.A. Pautov for help with literature and discussion, M.M. Moiseev for providing a specimen for the study, and N.A. Pekova for images of the chabazite specimens.
Conflict of interest. The authors declare that they have no conflicts of interest.
Author contribution. A.O. Karpov – conceptualization, IR spectroscopy, writing of the article; A.A. Agakhanov – EPMA and PXRD data. All the authors approved the final version of the manuscript prior to publication.
For citation: Karpov A.O., Agakhanov A.A. Cs-bearing chabazite from the Mariinskoe (Malyshevskoe) emerald-beryllium deposit, Middle Urals. Mineralogy, 2025, 11(4), 5–20. https://doi.org/10.35597/2313-545X-2025-11-4-1

Received 19.09.2025, revised 21.10.2025 accepted 10.11.2025

Andrey O. Karpov –  Mineralogical Museum RAS, Moscow, Russia; karpovao@my.msu.ru
Atali A. Agakhanov – Deputy Director, Fersman Mineralogical Museum RAS, Moscow, Russia; atali99@mail.ru.

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