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The electron-microprobe analyses of the studied twinnite material from Jas Roux, France, show a uniform chemical composition Pb 0.80 Tl 0.05 Sb 1.31 As 0.80 S 4.04 . Twinnite is monoclinic; the space group is  P 2 1 / n.  Lattice parameters obtained from single-crystal diffractometer data are  a  = 7.997(2) Å,  b  = 19.517(5) Å,  c  = 8.634(2) Å, and  β  = equal to 91.061(4)°. The structure of twinnite contains two distinct Pb sites, two Sb positions, two mixed-occupancy (As,Sb) positions and eight anions. The short (Sb,As)—S bonds are arranged into crankshaft chains. Twinnite is a  N  = 3 member of the sartorite homologous series. It is related to guettardite which has different symmetry and a substantially different Sb : As ratio. These two compounds are configurational polytypes, with unit OD layers having layer group symmetry  P 2 1 ( n ) m  and  P -1 in terms of twinnite lattice.

Twinnite, Pb 0.8 Tl 0.1 Sb 1.3 As 0.8 S 4 , the OD character and the question of its polytypism