In3Se is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. In(1) is bonded to eight equivalent In(1) and four equivalent Se(1) atoms to form distorted InIn8Se4 cuboctahedra that share corners with twelve equivalent In(1)In8Se4 cuboctahedra, edges with eight equivalent Se(1)In12 cuboctahedra, edges with sixteen equivalent In(1)In8Se4 cuboctahedra, faces with four equivalent Se(1)In12 cuboctahedra, and faces with fourteen equivalent In(1)In8Se4 cuboctahedra. Se(1) is bonded to twelve equivalent In(1) atoms to form distorted SeIn12 cuboctahedra that share corners with twelve equivalent Se(1)In12 cuboctahedra, edges with twenty-four equivalent In(1)In8Se4 cuboctahedra, faces with six equivalent Se(1)In12 cuboctahedra, and faces with twelve equivalent In(1)In8Se4 cuboctahedra.
In3Se is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. In(1) is bonded to eight equivalent In(1) and four equivalent Se(1) atoms to form distorted InIn8Se4 cuboctahedra that share corners with twelve equivalent In(1)In8Se4 cuboctahedra, edges with eight equivalent Se(1)In12 cuboctahedra, edges with sixteen equivalent In(1)In8Se4 cuboctahedra, faces with four equivalent Se(1)In12 cuboctahedra, and faces with fourteen equivalent In(1)In8Se4 cuboctahedra. All In(1)-In(1) bond lengths are 3.40 Å. All In(1)-Se(1) bond lengths are 3.40 Å. Se(1) is bonded to twelve equivalent In(1) atoms to form distorted SeIn12 cuboctahedra that share corners with twelve equivalent Se(1)In12 cuboctahedra, edges with twenty-four equivalent In(1)In8Se4 cuboctahedra, faces with six equivalent Se(1)In12 cuboctahedra, and faces with twelve equivalent In(1)In8Se4 cuboctahedra.