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inorganic compounds
The crystal structure of the mineral polyhalite, or dipotassium dicalcium magnesium tetrakis[sulfate(VI)] dihydrate, was reinvestigated by means of single-crystal X-ray diffraction data. The structural model previously reported was confirmed, although a higher precision of the refinement has been achieved. The structure consists of K[11] and Ca[8] polyhedra and [MgO4(H2O)2] octahedra sharing edges and faces; SO4 tetrahedra share edges with the polyhedra.
