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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… Click to show full abstract
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) Å 3 ; 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,Н 3 О) 13.5 REE 1.5 ]Ca 6 Mn 2 Zr 3 [Si 25.5 O 73.5 ]Cl · H 2 O. The problems of hydrolysis and central symmetry of minerals with eudialyte-type structure are discussed.
Journal Title: Crystallography Reports
Year Published: 2020
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