Abstract
A non-uniform distribution of faces in a zone parallel to a periodic bond chain is to be expected when a kinked face is situated between two flat faces. This occurs when the repeat distance d hkl is affected by glide planes, screw axes or pseudosymmetry in such a way that the number of periodic bond chains per period within a layer d hkl becomes smaller than one. Examples are given for the diamond and sphalerite structure types and for quartz.

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