Crystal structure of Rb-elpasolite Rb2NaAlF6 |
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| Authors: | O V Yakubovich G V Kiryukhina O V Dimitrova |
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| Institution: | 17765. Faculty of Geology, Moscow State University, Moscow, 119992, Russia
27765. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 119017, Russia
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| Abstract: | Single crystals of Rb2NaAlF6, the Rb analogue of the mineral elpasolite, are obtained in the NaF-Rb2CO3-Al2O3-Rb3PO4-H2O system under hydrothermal conditions, and their structure is determined by X-ray diffraction (R = 0.0188): a = 8.3087(1) Å, space group $Fm\bar 3m$ , Z = 4, and ρcalcd = 3.88 g/cm3. The hypothesis that Rb elpasolite exists in nature in late associations of pegmatites enriched in rubidium is proposed. |
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