New Data on the Isomorphism in Eudialyte-Group Minerals. III: Modular Structure of K Analog of Centrosymmetric Labyrinthiteстатья
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Дата последнего поиска статьи во внешних источниках: 13 июня 2019 г.
Аннотация:The crystal structure of a new modular eudialyte-group mineral from the Khibiny massifpotassium-rich analog of labyrinthitehas been investigated using X-ray diffraction. The trigonal-cell parameters are found to be a = 14.2167(6) angstrom, c = 60.798(3) angstrom, and V = 10641.8(1) angstrom(3); sp. gr. Rm. The crystal structure is refined to the final reliability factor R = 5.0% in the anisotropic approximation of atomic displacements using 1321F > 3 sigma(F). The idealized mineral formula (Z = 3) is Na30K5Fe3Ca12Zr6Si52O144(OH,O,H2O)(6)Cl-3. The problems of the central symmetry of modular representatives of the group and the isomorphism at M2 sites of alluaivite module are discussed.