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The crystal structure of norsethite, BaMg(CO 3 ) 2 , [ a  = 5.022(1) Å,  c  = 16.77(1) Å, space group  R [unk] m ,  Z  = 3] was reinvestigated by single crystal X-ray methods working with both natural and synthetic material. The main features of an earlier structure determination using powder data were confirmed, but no significant deviation of the atomic arrangement from  R [unk] m  was found. The carbonate group is aplanar; the most probable value for the distance of the carbon atom from the plane defined by the three oxygen atoms is estimated to be 0.044(7) Å.

Single crystal X-ray investigation of norsethite, BaMg(CO 3 ) 2 : one more mineral with an aplanar carbonate group