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Modular Structure of Highly Ordered Eudialyte and Its Place among Hydrated Minerals of Rastsvetaevite Familyстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 17 октября 2017 г.
- Авторы: Rastsvetaeva R.K., Viktorova K.A., Aksenov S.M.
- Журнал: Crystallography Reports
- Том: 62
- Номер: 4
- Год издания: 2017
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 551
- Последняя страница: 557
- DOI: 10.1134/S1063774517040186
- Аннотация: The crystal structure of a representative of eudialyte group, which was found by A.P. Khomyakov at the Rasvumchorr mountain of the Khibiny alkaline massif (Kola Peninsula), has been studied by X-ray diffraction. The trigonal unit-cell parameters are found to be a = 14.2328(5) angstrom, c = 60.217(2) parallel to, V = 10564.08(3) angstrom(3), sp. gr. R3m. The structure has been refined with the isotropic and anisotropic approximation displacement parameters to the total reliability factor R = 5.6%, based on 2989 reflections with vertical bar F vertical bar > 4 sigma(F). The idealized formula (Z = 3) is determined as [(H3O)(11)Na(10)K5]CD degrees(12)(Na3Fe2Mn)Si4Zr6(Si48O144)(OH,Cl)(5)(H2O)(5). The unit cell of the mineral is doubled due to the presence of two modules of different composition and structure in it (alluaivite-and kentbrooksite-like ones) and the formation of a polyhedral cluster in the kentbrooksite module. A comparison with two hydrated minerals having a modular structure shows that these minerals, being similar in their chemical composition, differ in the cation ordering over the sites of the two modules. The sample under study contains potassium in only one module, while oxonium groups are distributed in both modules but over different sites.
- Добавил в систему: Аксенов Сергей Михайлович