Abstract[Cr(C404)3/2 . 7H20], CsCrO 6. 7H20, monoclinic, C2/c, a= 14.878 (5), b= 15.434 (3), c= 11.500 (3)/~, t= 112.33 (6) ° , V= 2442.7/~3, Z= 8, Do= 1.89, De= 1.88 Mg m -3. R =0.044 for 1956 reflections. One complete squarate ion exists in the asymmetric unit, and another half squarate exists in the asymmetric unit with four atoms on a twofold rotation axis. The hexaaquachromium(III) ion is hydrogen bonded to the squarate ions and to the remaining water molecule in the asymmetric unit.