Abstract
Fluoro-sodalite was synthesized for the first time at temperatures of 400–800°C and H2O pressures of 1–2 kbar in the Si–Al–Na–H–O–F system. X-ray diffraction and infrared spectroscopic investigations showed that fluorine is incorporated in the sodalite structure as anionic octahedral groups, [AlF6]3–, the number of which can vary from 0 to 1. Correspondingly, the end-members of the F-sodalite series are Na7(H2O)8[Si5Al7O24] and Na8(AlF6)(H2O)4[Si7Al5O24]. Depending on the composition of the system, F-sodalite associates at 500–650°C with nepheline, albite, cryolite, and villiaumite, which are joined by analcime below 500°C and aluminosilicate melt above 650°C. Fluorine-bearing sulfate–chlorine-sodalite was found for the first time in a pegmatite sample from the Lovozero massif. The highest fraction of the fluorine end-member in natural sodalite is 0.2. The incorporation of F into the sodalite structure requires much more energy compared with Cl– and SO 2-4 , because it is accompanied by a structural rearrangement and a transition from tetrahedral Al to octahedral Al.
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Original Russian Text © E.N. Gramenitskii, A.R. Kotel’nikov, T.I. Shchekina, O.V. Yakubovich, V.N. Devyatova, E.S. Zubkov, N.I. Suk, M.F. Vigasina, Z.A. Kotel’nikova, 2018, published in Geokhimiya, 2018, No. 6, pp. 527–540.
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Gramenitskii, E.N., Kotel’nikov, A.R., Shchekina, T.I. et al. Composition, Structure, and Conditions of Formation of Fluorine-Bearing Sodalite: Experimental Evidence. Geochem. Int. 56, 521–534 (2018). https://doi.org/10.1134/S0016702918060058
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DOI: https://doi.org/10.1134/S0016702918060058