The interpretation of the Raman spectra of lawsonite at various temperatures proposed in our article (Kolesov et al., 2008) was based first of all on structural data. The numerous crystal-structure studies (Libowitzky & Armbruster, 1995; Libowitzky & Rossman, 1996; Meyer et al., 2001; Kolesov et al., 2008) show that the space group of lawsonite at T ≥ 270 K is Cmcm. A set of symmetry operations of the group involves a mirror plane perpendicular to the water molecule plane in the crystal that fixes the symmetrical state of H...
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