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The crystal structure of gillulyite Tl 2 (As, Sb) 8  S 13  was reinterpreted based on the average structure determined by Foit et al. (1995). It consists of alternating PbS-like slabs comprised of As-S polyhedra and Tl-bearing slabs with partly zeolitic properties. In the latter, TlS 5  and As 2 S 5  groups alternate regularly along the b direction and across the width of the slab, thus eliminating the need for S-S and As-As bonds postulated by Foit et al. (1995). These two types of slabs are also unit order-disorder (OD) layers, the ambiguities in stacking of which lead to several potential gillulyite polytypes. The actually observed OD phenomena are caused by ambiguity in the position of [010] TlS 5 -As 2 S 5  sequences (or of entire such layers), which can with equal probability assume two positions 1b apart.

Gillulyite Tl 2 (As,Sb) 8 S 13 : Reinterpretation of the crystal structure and order-disorder phenomena