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Mn-bearing eleonorite from Hagendorf South pegmatite, Germany: crystal structure and crystal-chemical relationships with other beraunite-type phosphatesстатья
Информация о цитировании статьи получена из
Web of Science,
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
- Авторы: Aksenov Sergey M., Chukanov Nikita, V, Goettlicher Joerg, Hochleitner Rupert, Zarubina Ekaterina S., Rastsvetaeva Ramiza K.
- Журнал: Zeitschrift für Kristallographie – Crystalline Materials
- Том: 233
- Номер: 7
- Год издания: 2018
- Издательство: Walter de Gruyter
- Местоположение издательства: Berlin, Germany
- Первая страница: 469
- Последняя страница: 477
- DOI: 10.1515/zkri-2017-2099
- Аннотация: Mn2+-bearing eleonorite from the Hagendorf South pegmatite situated south of Waidhaus, Upper Palatinate, Bavaria, Germany was study based on single crystal X-ray analysis, Mn and Fe K-edge XANES spectroscopy, as well as IR spectroscopy. According to spectroscopic data, all Mn is bivalent, and all Fe is trivalent. The empirical formula of the mineral is (Mn0.582+Zn0.13Mg0.04Fe5.243+)(Sigma 5.98)(PO4)(4)(H2O,OH,O)(11). The monoclinic unit-cell parameters are: a = 20.832(3) angstrom, b = 5.1569(3) angstrom, c = 19.200(2) angstrom, beta = 93.01(1)degrees; space group C2/c . The structure was refined to R-1 = 5.20% in anisotropic approximation using 1994 reflections with I > 3 sigma(I). Despite in most beraunite-group minerals M1-site demonstrates selective accumulation of bivalent cations, in Mn-bearing eleonorite Mn2+-cations are disordered between octahedral sites without statistical predominance anywhere; all octahedral M (1-4)-sites are predominantly occupied by Fe3+. M1-site is half-occupied by Fe3+ and contains subordinate Mn2+ and minor Zn2+ and Mn2+. Based on the new data we suppose that Mn-bearing eleonorite was formed as a secondary phase as a result of oxidation of a primary Mn-bearing beraunite-group mineral in with Mn2+ was initially distributed between different M sites.
- Добавил в систему: Аксенов Сергей Михайлович