Ternary europium copper sulfide Eu 2 CuS 3 have been investigated by X-ray diffraction, 1 5 1 Eu Mossbauer spectroscopy, magnetic susceptibility, magnetization, and specific heat measurements. In this compound, Eu 2 + and Eu 3 + ions occupy two crystallographically independent sites. The 1 5 1 Eu Mossbauer spectra indicate that the Eu 2 + and Eu 3 + ions exist in the molar ratio of 1:1, and the Debye temperatures of Eu 2 + and Eu 3 + are 180 and 220K, respectively. In its magnetic susceptibility, the divergence between the zero-field cooled and field cooled susceptibilities appears below 3.4K. The specific heat has a λ-type anomaly at the same temperature. From the field dependence of magnetization at 1.8K, the Eu 2 + ion was found to be in the ferromagnetic state with the saturation magnetization M S =6.7μ B .