Abstract
The chemical composition, crystal structure, and characteristics of the Raman spectrum of a highly hydrated aqualite-like mineral of the eudialyte group from the Kovdor massif (Kola Peninsula, Russia), in which potassium and hydronium group H3O+ are the species-defining extraframework cations, are studied. The simplified formula of the mineral is (H3O)8Na5K2Zr3Ca6[Si24O69(OH)3][Si2]Mn(OH)2Cl·2H2O. It is characterized by space group R3 and unit-cell parameters a = 14.184(1), c = 30.797(1) Å, V = 5366.27(1) Å3. A specific feature of this mineral, which distinguishes it from all other representatives of the eudialyte group, is a high degree of order in the distribution of large extraframework cations (Na+, K+, Sr2+, Ba2+, Ln3+, and H3O+) over split sites of the crystal structure. In the studied mineral, some oxonium ions form complexes with water molecules with extremely strong hydrogen bonds similar to those that are realized in proton hydrate complexes such as Zundel and Eigen cations.
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Translated by L. Mukhortova
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Rastsvetaeva, R.K., Chukanov, N.V., Pekov, I.V. et al. Crystal-Chemical Features of a Cation-Ordered Potassium Analog of Aqualite from the Kovdor Massif (Kola Peninsula). Geol. Ore Deposits 65, 754–764 (2023). https://doi.org/10.1134/S1075701523070085
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DOI: https://doi.org/10.1134/S1075701523070085