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The monoclinic crystal structure of georgbokiite, a new mineral with the chemical composition Cu 5 O 2 (SeO 3 ) 2 Cl 2  ( a  = 6.030(1) Å),  b  = 13.744(3) Å,  c  = 5.562(1) Å,  β  = 95.75(1)°,  V  = 458.6(2) Å 3 ,  Z  = 2,  P 2 1 / c ) has been refined to an  R  index of 0.043 [ wR  = 0.108). The structure is similar to that previously determined for synthetic Cu 5 Se 2 O 8 Cl 2 . It is based on the unbranched  zweier  chains { uB , 1 χ  1 } [O 2 Cu 5 ] running parallel to the  c  axis which are composed of [OCu 4 ] oxocentered copper tetrahedra linked through corners and edges in turn. The pyramidal (SeO 3 ) groups are in “face-to-face” positions relative to the [OCu 4 ] tetrahedra and together with the oxocentered chains form the more complex chains {[O 2 Cu 5 ](SeO 3 ) 2 } lying side by side in the (010) plane. The chloride anions are located between the chains to link them into a three-dimensional framework. The main structural features of other inorganic compounds based on single chains of oxocentered condensed copper tetrahedra are discussed in comparison.

zeitschrift für kristallographie - crystalline materials

Crystal chemistry of inorganic compounds based on chains of oxocentered tetrahedra III. Crystal structure of georgbokiite, Cu 5 O 2 (SeO 3 ) 2 Cl 2   1