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Figure 1
(a) A view along [010] of a module of the penkvilksite structure consisting of isolated Ti1 octa­hedra (dark; blue in the electronic version of the paper) and [001] chains of Si tetra­hedra (light, yellow); different stackings of this module along [100] lead to the polytypes discussed in the Comment. (b) The (100) silicate layer formed by the [001] chains: clockwise and counterclockwise chains are differently coloured. Light (orange) and dark (cyan) circles represent, respectively, Na1 and water O atoms.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 64| Part 11| October 2008| Pages i87-i90
doi:10.1107/S0108270108031806
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