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Al,Si order in the crystal structure of -eucryptite (LiAlSiO₄)

¹ Institut für Mineralogie, Ruhr-Universtät Bochum, D-44780 Bochum, Germany
² University of British Columbia, Department of Chemistry, 2036 Main Mall, Vancouver B.C., V6T 1Z1 Canada

The crystal structure of -eucryptite, LiAlSiO₄, is reinvestigated by combining ²⁹Si NMR spectroscopy and single-crystal X-ray diffraction. The silicon coordination in -eucryptite of three different samples (two of natural, one of synthetic origin) is shown to be identical on a local scale by means of ²⁹Si MAS NMR spectroscopy. This method also suggests a well ordered arrangement of Si and Al within the crystal structure of -eucryptite and the presence of two symmetrically non-equivalent sites for silicon. The refinement of the structure of a natural crystal using single-crystal X-ray diffraction confirms these observations and demonstrates the presence of long-range Al-Si order and the acentric space group R3.