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A bismuth oxide sulfate, [Bi 1 –  x  Co  x  O] 2 (SO 4 ) 1 –  x  0.14 ≤  x  ≤ 0.18 , was prepared by interacting CoSO 4  with Bi 2 O 3 . Single crystals were obtained and investigated by X-ray diffraction. They are monoclinic,  C 2,  a  = 5.615(3) Å,  b  = 5.535(2) Å,  c  = 8.080(2) Å,  β  = 108.97(5)°,  Z  = 2,244 measured reflexions:  R  = 0.079. The structure consists of continuous [Bi 1 –  x  Co  x  O]  n   fluorite-like layers separated by SO 4  2−  anions. It shows close structural similarity to the mineral nadorite, PbSbO 2 Cl and the already reported [Bi 2 CoO 3 ]SO 4  (Fanariotis and Rentzeperis, 1987).

Crystal growth and X-ray investigation of a layered bismuth oxide sulfate in the CoSO 4 – Bi 2 O 3 system