The interest for the environmental, industrial and technological applications of Si-rich zeolites is very high. Among the large-pore zeolites, faujasite is one of the most exploited. The aim of this paper is to obtain detailed structural information on natural and NH4-exchanged faujasite before using this zeolite for dealumination tests, targeting the realization of large single crystals of all-silica faujasite. As one of the most Si-rich natural samples, faujasite from Sasbach (Na13.64K0.87Mg10.46Ca8.89Sr0.34(Al51.95Si139.57)O384∙272.29 H2O; space group Fd-3m;a = 24.6906(2) Å) was chosen for study. Single-crystal X-ray diffraction structural refinements of both natural and NH4-exchanged samples are reported and discussed. In the natural faujasite sample, almost all the extraframework species could be located for the first time. In the NH4-exchanged sample the ammonium and water molecule sites were located. Ammonium cations occupy two of the sites occupied by the extraframework species in the original mineral.

Structure of natural and NH4-exchanged Sasbach faujasite: a single-crystal study / Fantini, Riccardo; Rossella, Arletti; Linda, Pastero; Simona, Quartieri; Francesco Di Renzo, ; Fernando, Cámara; Vezzalini, Maria Giovanna; Arletti, Rossella. - In: EUROPEAN JOURNAL OF MINERALOGY. - ISSN 0935-1221. - 30:3(2018), pp. 515-523.

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