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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\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\overline 3 $$\end{document}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.
Crystallography Reports – Springer Journals
Published: Jan 25, 2020
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