Acta Cryst. (2000). B56, 828-832 [ doi:10.1107/S0108768100008727 ]
Abstract: It is possible to understand, or at least rationalize, the occurrence of pseusosymmetry elements in some crystals as a consequence of a higher symmetry in a two-dimensional layer being obscured by the three-dimensional packing of the layers. Six examples, including both simple compounds and co-crystals and involving six different symmetries, are described.
Keywords: Packing; Pseudosymmetry.
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