RAS PhysicsКристаллография Crystallography Reports

  • ISSN (Print) 0023-4761
  • ISSN (Online) 3034-5510

Dissymmetrization in Eudialyte-group Minerals. V. Crystal Structure of Potentially New Mineral from Moroccan Pegmatite – First High Calcium Member with Р3-Symmetry

PII
S30345510S0023476125050045-1
DOI
10.7868/S3034551025050045
Publication type
Article
Status
Published
Authors
Volume/ Edition
Volume 70 / Issue number 5
Pages
736-743
Abstract
A study of the crystal structure of high-calcium eudialyte from the Tamazert massif (Morocco) revealed features of its structure that reduce the symmetry of the mineral. The parameters of the trigonal cell are: a = 14.1863(1), c = 30.0703(2) Å, V = 5240.95(4) Å, sp. gr. P3. The structure, the unit cell of which contains 161 independent positions of atoms, is refined to the final divergence factor R = 4.4% in the isotropic approximation of atomic displacements using 8202 reflexes with F > 3σ(F). The ordering of Ca and Mn atoms in the octahedra of the six-membered rings, Fe and Mn in the M2 positions between the translation-bound rings, as well as Na, HO, La and K in the extra-framework N positions has been established. The studied mineral is chemically similar to golyshevite and feklichevite, from which it differs in a lower calcium content and a higher manganese content. The main features of the mineral are discussed in comparison with the previously studied high-calcium minerals of the eudialyte group within the framework of the R3 sp. gr. It is shown that a decrease in the symmetry of the structural model of high-calcium representatives of the eudialyte group may be due to the ordering of cations inhabiting the N-positions of the extra-framework part of the structure.
Keywords
Date of publication
22.02.2025
Year of publication
2025
Number of purchasers
0
Views
27

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