Articles | Volume 35, issue 1
https://doi.org/10.5194/ejm-35-65-2023
https://doi.org/10.5194/ejm-35-65-2023
Research article
 | 
31 Jan 2023
Research article |  | 31 Jan 2023

Bobtraillite from Gejiu hyperagpaitic nepheline syenite, southwestern China: new occurrence and crystal structure

Yanjuan Wang, Fabrizio Nestola, Zengqian Hou, Xiangping Gu, Guochen Dong, Zhusen Yang, Guang Fan, Zhibin Xiao, and Kai Qu

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Cited articles

Alferyeva, Y. O., Gramenitskii, E. N., and Shchekina, T. I.: Experimental study of phase relations in a lithium-bearing fluorine-rich haplogranite and nepheline syenite system, Geochem. Int., 49, 676–690, 2011. 
Andersen, T., Erambert, M., Larsen, A. O., and Selbekk, R. S.: Petrology of nepheline syenite pegmatites in the Oslo Rift, Norway: Zirconium silicate mineral assemblages as indicators of alkalinity and volatile fugacity in mildly agpaitic magma, J. Petrol., 51, 2303–2325, 2010. 
Bailey, J. C.: Geochemistry of boron in the Ilímaussaq alkaline complex, South Greenland, Lithos, 91, 319–330, 2006. 
Blinov, V. A., Shumyatskaya, N. G., Voronkov, A. A., Ilyukhin, V. V., and Belov, N. V.: Refinement of the crystal structure of wadeite K2Zr[Si3O9] and its relationship to kindred structural types, Sov. Phys. Crystallogr., 22, 31–35, 1977. 
Boettcher, A. L. and Wyllie, P. J.: Jadeite stability measured in the presence of silicate liquids in the system NaAlSiO4–SiO2–H2O, Geochim. Cosmochim. Ac., 32, 999–1012, 1968. 
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Short summary
Bobtraillite is an extremely rare cyclosilicate with a unique composition and complex structure. In this paper, we describe the second occurrence of the extremely rare complex zirconium silicate. The results suggest that the ideal formula of bobtraillite could be written as (Na, □)12(□, Na)12Sr12Zr14(Si3O9)10[Si2BO7(OH)2]6·12H2O.