The crystal structure of calcium chloride rhenate(VII) dihydrate, CaCl(ReO4).2H2O, investigated at 85 K, consists of calcium cations, chloride anions, rhenate(VII) anions and water molecules. In the nearly tetrahedral rhenate(VII) anion, all constituent atoms lie on special positions of m2m (Re) and m (O) site symmetries.
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