Abstract. ICaCI61IMg(H20)6] 2, rhombohedral, R3, hexagonal cell a = 10.136 (1), c = 17.318 (2) A, Z = 3, D x --1.673 Mg in --3, Mo Ka radiation (2 = 0.71069 A), p = 11.18 mm -l. Full-matrix least-squares refinement of 1394 nonequivalent hkl gave R = 0.042 and R,,, = 0.051. The structure contains isolated, octahedrally coordinated cations, with distances Ca-CI
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