Cu2CdSiS4 is Stannite-like structured and crystallizes in the orthorhombic Pmn2_1 space group. Cu(1) is bonded to one S(1), one S(2), and two equivalent S(3) atoms to form CuS4 tetrahedra that share corners with four equivalent Cu(1)S4 tetrahedra, corners with four equivalent Cd(1)S4 tetrahedra, and corners with four equivalent Si(1)S4 tetrahedra. Cd(1) is bonded to one S(1), one S(2), and two equivalent S(3) atoms to form CdS4 tetrahedra that share corners with four equivalent Si(1)S4 tetrahedra and corners with eight equivalent Cu(1)S4 tetrahedra. Si(1) is bonded to one S(1), one S(2), and two equivalent S(3) atoms to form SiS4 tetrahedra that share corners with four equivalent Cd(1)S4 tetrahedra and corners with eight equivalent Cu(1)S4 tetrahedra. There are three inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Cu(1), one Cd(1), and one Si(1) atom to form corner-sharing SCdCu2Si tetrahedra. In the second S site, S(2) is bonded to two equivalent Cu(1), one Cd(1), and one Si(1) atom to form corner-sharing SCdCu2Si tetrahedra. In the third S site, S(3) is bonded to two equivalent Cu(1), one Cd(1), and one Si(1) atom to form corner-sharing SCdCu2Si tetrahedra.
Cu2CdSiS4 is Stannite-like structured and crystallizes in the orthorhombic Pmn2_1 space group. Cu(1) is bonded to one S(1), one S(2), and two equivalent S(3) atoms to form CuS4 tetrahedra that share corners with four equivalent Cu(1)S4 tetrahedra, corners with four equivalent Cd(1)S4 tetrahedra, and corners with four equivalent Si(1)S4 tetrahedra. The Cu(1)-S(1) bond length is 2.32 Å. The Cu(1)-S(2) bond length is 2.31 Å. There is one shorter (2.31 Å) and one longer (2.34 Å) Cu(1)-S(3) bond length. Cd(1) is bonded to one S(1), one S(2), and two equivalent S(3) atoms to form CdS4 tetrahedra that share corners with four equivalent Si(1)S4 tetrahedra and corners with eight equivalent Cu(1)S4 tetrahedra. The Cd(1)-S(1) bond length is 2.56 Å. The Cd(1)-S(2) bond length is 2.55 Å. Both Cd(1)-S(3) bond lengths are 2.58 Å. Si(1) is bonded to one S(1), one S(2), and two equivalent S(3) atoms to form SiS4 tetrahedra that share corners with four equivalent Cd(1)S4 tetrahedra and corners with eight equivalent Cu(1)S4 tetrahedra. The Si(1)-S(1) bond length is 2.16 Å. The Si(1)-S(2) bond length is 2.16 Å. Both Si(1)-S(3) bond lengths are 2.16 Å. There are three inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Cu(1), one Cd(1), and one Si(1) atom to form corner-sharing SCdCu2Si tetrahedra. In the second S site, S(2) is bonded to two equivalent Cu(1), one Cd(1), and one Si(1) atom to form corner-sharing SCdCu2Si tetrahedra. In the third S site, S(3) is bonded to two equivalent Cu(1), one Cd(1), and one Si(1) atom to form corner-sharing SCdCu2Si tetrahedra.