Red plates of Cs-5[U-2(mu-S-2)(2)Cl-8]I were Obtained in good yield from the reaction at 1173 K of U, GeI2 or SnI4, and S, with CsCl flux. The compound crystallizes in space group D-2h(25)-Immm of the orthorhombic system in the Cs-5[Nb-2(mu-S-2)(2)Cl-8]Cl structure type. The centrosymmetric [U-2(mu-S-2)(2)Cl-8](4-) anion in the structure has mmm symmetry with the two U4+ atoms separated by 3.747(1) angstrom. Each U atom is coordinated to four Cl atoms and four S atoms from two S-2(2-) groups in a square-antiprismatic arrangement. The polarized absorbance spectra of Cs-5[U-2(mu-S-2)(2)Cl-8]I display prominent optical anisotropy. Magnetic measurements are consistent with the modified Curie-Weiss law at high temperatures. The low-temperature behavior may arise from antiferromagnetic coupling of the U4+ ions within the anion.