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A structural study has been undertaken on a cobaltoan dolomite, with chemical formula CaMg 0.83 Co 0.17 (CO 3 ) 2  (cal­cium magnesium cobalt dicarbonate), from Kolwezi, Democratic Republic of Congo. Pale-pink euhedral cobaltoan dolomite was associated with kolwezite [(Cu 1.33 Co 0.67 )(CO 3 )(OH) 2 ] and cobaltoan malachite [(Cu,Co) 2 (CO 3 )(OH) 2 ]. A crystal with a Co:Mg ratio of 1:5.6 (SEM/EDAX measurement), twinned on (11 -2 0) was used for crystal structural refinement. The refinement of the structural model of Reeder & Wenk [ Am. Mineral.  (1983  ▸ ),  68 , 769–776; Ca at site 3 a  with site symmetry -3; Mg site at site 3 b  with site symmetry -3; C at site 6 c  with site symmetry 3; O at site 18 f  with site symmetry 1] showed that Co is totally incorporated in the Mg site, with refined occupancy Mg 0.83 Co 0.17 , which compares with Mg 0.85 Co 0.15  from chemical data. The Co substitution reflects in the expansion of the cell volume, with a pronounced increasing of the  c  cell parameter.

Crystal structure study of a cobaltoan dolomite from Kolwezi, Democratic Republic of Congo