The translation-gliding elements recorded for various crystals of the NaCl structural type display an unexpected lack of similarity for crystals of the same structure. New experiments indicate that the gliding elements recorded for NaF are incorrect and that hitherto unknown modes of gliding are possible for NaF, NaCl, KCl, KBr, and KI. In addition, NaBr, NaJ and PbTe have been investigated for gliding. All of the NaCl-like crystals, NaF, NaCl, NaBr, Nal, KC1, KBr, KI, PbS and PbTe glide with T=(001), t = [110]. Of these, all but PbS and PbTe also glide with T=(110), t = [110], as do also high-NH4I, RbCl, and MgO; these are the usual halite gliding elements. The gliding is shown to be dependent on crystal structure; t is determined by rows of nearest like charged ions; T is dependent on ion radius ratio as well as on the polarizabilities of the ions involved. These factors influencing gliding are operative also in all other crystals for which both structural and gliding are sufficiently complete to allow of correlations.

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