Cu2SnS3 is Enargite-like structured and crystallizes in the monoclinic Cc space group. There are two inequivalent Cu sites. In the first Cu site, 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 two equivalent Cu(1)S4 tetrahedra, corners with five equivalent Cu(2)S4 tetrahedra, and corners with five equivalent Sn(1)S4 tetrahedra. In the second Cu site, Cu(2) is bonded to one S(1), one S(3), and two equivalent S(2) atoms to form CuS4 tetrahedra that share corners with two equivalent Cu(2)S4 tetrahedra, corners with five equivalent Cu(1)S4 tetrahedra, and corners with five equivalent Sn(1)S4 tetrahedra. Sn(1) is bonded to one S(2), one S(3), and two equivalent S(1) atoms to form SnS4 tetrahedra that share corners with two equivalent Sn(1)S4 tetrahedra, corners with five equivalent Cu(1)S4 tetrahedra, and corners with five equivalent Cu(2)S4 tetrahedra. There are three inequivalent S sites. In the first S site, S(1) is bonded to one Cu(1), one Cu(2), and two equivalent Sn(1) atoms to form SCu2Sn2 tetrahedra that share corners with two equivalent S(1)Cu2Sn2 tetrahedra, corners with five equivalent S(2)Cu3Sn tetrahedra, and corners with five equivalent S(3)Cu3Sn tetrahedra. In the second S site, S(2) is bonded to one Cu(1), two equivalent Cu(2), and one Sn(1) atom to form SCu3Sn tetrahedra that share corners with two equivalent S(2)Cu3Sn tetrahedra, corners with five equivalent S(1)Cu2Sn2 tetrahedra, and corners with five equivalent S(3)Cu3Sn tetrahedra. In the third S site, S(3) is bonded to one Cu(2), two equivalent Cu(1), and one Sn(1) atom to form SCu3Sn tetrahedra that share corners with two equivalent S(3)Cu3Sn tetrahedra, corners with five equivalent S(1)Cu2Sn2 tetrahedra, and corners with five equivalent S(2)Cu3Sn tetrahedra.
Cu2SnS3 is Enargite-like structured and crystallizes in the monoclinic Cc space group. There are two inequivalent Cu sites. In the first Cu site, 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 two equivalent Cu(1)S4 tetrahedra, corners with five equivalent Cu(2)S4 tetrahedra, and corners with five equivalent Sn(1)S4 tetrahedra. The Cu(1)-S(1) bond length is 2.32 Å. The Cu(1)-S(2) bond length is 2.29 Å. There is one shorter (2.29 Å) and one longer (2.30 Å) Cu(1)-S(3) bond length. In the second Cu site, Cu(2) is bonded to one S(1), one S(3), and two equivalent S(2) atoms to form CuS4 tetrahedra that share corners with two equivalent Cu(2)S4 tetrahedra, corners with five equivalent Cu(1)S4 tetrahedra, and corners with five equivalent Sn(1)S4 tetrahedra. The Cu(2)-S(1) bond length is 2.32 Å. The Cu(2)-S(3) bond length is 2.28 Å. Both Cu(2)-S(2) bond lengths are 2.29 Å. Sn(1) is bonded to one S(2), one S(3), and two equivalent S(1) atoms to form SnS4 tetrahedra that share corners with two equivalent Sn(1)S4 tetrahedra, corners with five equivalent Cu(1)S4 tetrahedra, and corners with five equivalent Cu(2)S4 tetrahedra. The Sn(1)-S(2) bond length is 2.41 Å. The Sn(1)-S(3) bond length is 2.41 Å. There is one shorter (2.51 Å) and one longer (2.52 Å) Sn(1)-S(1) bond length. There are three inequivalent S sites. In the first S site, S(1) is bonded to one Cu(1), one Cu(2), and two equivalent Sn(1) atoms to form SCu2Sn2 tetrahedra that share corners with two equivalent S(1)Cu2Sn2 tetrahedra, corners with five equivalent S(2)Cu3Sn tetrahedra, and corners with five equivalent S(3)Cu3Sn tetrahedra. In the second S site, S(2) is bonded to one Cu(1), two equivalent Cu(2), and one Sn(1) atom to form SCu3Sn tetrahedra that share corners with two equivalent S(2)Cu3Sn tetrahedra, corners with five equivalent S(1)Cu2Sn2 tetrahedra, and corners with five equivalent S(3)Cu3Sn tetrahedra. In the third S site, S(3) is bonded to one Cu(2), two equivalent Cu(1), and one Sn(1) atom to form SCu3Sn tetrahedra that share corners with two equivalent S(3)Cu3Sn tetrahedra, corners with five equivalent S(1)Cu2Sn2 tetrahedra, and corners with five equivalent S(2)Cu3Sn tetrahedra.