Crystal data for RuIn3 are reported. The material is tetragonal, , with a = 6.9983 (3), c = 7.2440 (4) Å, Vol = 354.78 Å3, Z = 4, Dc = 8.34 gm/cm3. It is isostructural with the compound CoGa3. The crystals of RuIn3, which form long needles, display electrical resistivity characteristics of a typical metal.
Intensity data were obtained from a diffractometer trace taken with CuKα radiation, λ = 1.54178 Å. The structure was refined by least-squares calculations to R1 = 0.116 with 53 observed reflections. Powder pattern data are also given.