Rb2Cu2SnS4 crystallizes in the orthorhombic Ibam space group. Rb(1) is bonded in a distorted body-centered cubic geometry to eight equivalent S(1) atoms. Cu(1) is bonded to four equivalent S(1) atoms to form distorted CuS4 tetrahedra that share corners with two equivalent Sn(1)S4 tetrahedra,  an edgeedge with one Sn(1)S4 tetrahedra, and edges with two equivalent Cu(1)S4 tetrahedra. Sn(1) is bonded to four equivalent S(1) atoms to form SnS4 tetrahedra that share corners with four equivalent Cu(1)S4 tetrahedra and edges with two equivalent Cu(1)S4 tetrahedra. S(1) is bonded in a 7-coordinate geometry to four equivalent Rb(1), two equivalent Cu(1), and one Sn(1) atom.
Rb2Cu2SnS4 crystallizes in the orthorhombic Ibam space group. Rb(1) is bonded in a distorted body-centered cubic geometry to eight equivalent S(1) atoms. There are a spread of Rb(1)-S(1) bond distances ranging from 3.43-3.66 Å. Cu(1) is bonded to four equivalent S(1) atoms to form distorted CuS4 tetrahedra that share corners with two equivalent Sn(1)S4 tetrahedra,  an edgeedge with one Sn(1)S4 tetrahedra, and edges with two equivalent Cu(1)S4 tetrahedra. There are two shorter (2.32 Å) and two longer (2.52 Å) Cu(1)-S(1) bond lengths. Sn(1) is bonded to four equivalent S(1) atoms to form SnS4 tetrahedra that share corners with four equivalent Cu(1)S4 tetrahedra and edges with two equivalent Cu(1)S4 tetrahedra. All Sn(1)-S(1) bond lengths are 2.44 Å. S(1) is bonded in a 7-coordinate geometry to four equivalent Rb(1), two equivalent Cu(1), and one Sn(1) atom.