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Figure 4
Structure of kermesite, OD layer L0, idealized structure model, projection along the a vector of Kupčík's cell in the ball-and-stick model, with all symmetry elements corresponding to the λ-POs indicated. The mirror and glide planes are only indicated on the right margin in order to preserve the clarity of the picture. Two unit cells (protocells) are indicated; in the lower one the atom labels are displayed, in the upper one the numbers indicate the x coordinates (×102) of the atoms. There are 8 formula units per protocell. The O atoms are located in σ-ρ planes, so respective red balls represent the half-atoms. Of Sb3, Sb4 pyramids, only basal S atoms are displayed as the apical atoms belong to adjacent OD layers. Note also the lateral shifts of Sb3, Sb4 atoms. Symbolic figures (see §3.3.4[link] and Fig. 5[link]), here overlapping the symbols of inversion centers, are also displayed in the appropriate places with local symmetry 2/m.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 69| Part 6| October 2013| Pages 570-583
doi:10.1107/S2052519213024238
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