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New Data on the Isomorphism in Eudialyte-Group Minerals. V: Crystal Structure of an Intermediate Member of the Manganoeudialyte‒Ilyukhinite Isomorphous Series

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Abstract

The crystal structure of a high-symmetry representative of the eudialyte group from the Norra Kärr massif (Sweden) has been investigated by X-ray diffraction analysis and IR spectroscopy. The trigonal unit-cell parameters are found to be a = 14.1767(4) Å, c = 30.286(1) Å, and V = 5271.3 (3) Å3; sp. gr. R\(\overline 3 \)m. The crystal structure is refined to the final reliability factor R = 6.4% in the anisotropic approximation of atomic displacements using 1071 reflections with F > 3σ(F). The idealized formula of the mineral (Z = 3) is [(Na,Н3О)13.5REE1.5]Ca6Mn2Zr3[Si25.5O73.5]Cl · H2O. The problems of hydrolysis and central symmetry of minerals with eudialyte-type structure are discussed.

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Funding

This study was supported by the Ministry of Science and Higher Education of the Russian Federation within the State assignment for the Federal Scientific Research Centre “Crystallography and Photonics” of the Russian Academy of Sciences in the part concerning the X-ray diffraction analysis and by the Russian Foundation for Basic Research in the part concerning the crystallochemical analysis of microporous eudialyte-group minerals (project no. 18-29-12005) and in the part concerning the IR spectroscopy and analysis of the chemical composition (project no. 18-29-12007_mk).

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Correspondence to R. K. Rastsvetaeva.

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Translated by Yu. Sin’kov

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Rastsvetaeva, R.K., Chukanov, N.V., Möckel, S. et al. New Data on the Isomorphism in Eudialyte-Group Minerals. V: Crystal Structure of an Intermediate Member of the Manganoeudialyte‒Ilyukhinite Isomorphous Series. Crystallogr. Rep. 65, 27–32 (2020). https://doi.org/10.1134/S1063774520010204

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  • DOI: https://doi.org/10.1134/S1063774520010204

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