SrLaCuS3 crystallizes in the orthorhombic Pnma space group. Sr(1) is bonded in a 7-coordinate geometry to two equivalent S(1), two equivalent S(3), and three equivalent S(2) atoms. La(1) is bonded to two equivalent S(1), two equivalent S(2), and three equivalent S(3) atoms to form distorted LaS7 pentagonal bipyramids that share corners with two equivalent La(1)S7 pentagonal bipyramids,  a cornercorner with one Cu(1)S4 tetrahedra, edges with four equivalent La(1)S7 pentagonal bipyramids, and edges with four equivalent Cu(1)S4 tetrahedra. Cu(1) is bonded to one S(2), one S(3), and two equivalent S(1) atoms to form CuS4 tetrahedra that share  a cornercorner with one La(1)S7 pentagonal bipyramid, corners with two equivalent Cu(1)S4 tetrahedra, and edges with four equivalent La(1)S7 pentagonal bipyramids. There are three inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Sr(1), two equivalent La(1), and two equivalent Cu(1) atoms to form distorted SSr2La2Cu2 pentagonal pyramids that share corners with two equivalent S(2)Sr3La2Cu octahedra, corners with five equivalent S(3)Sr2La3Cu octahedra, corners with two equivalent S(1)Sr2La2Cu2 pentagonal pyramids, edges with two equivalent S(3)Sr2La3Cu octahedra, edges with five equivalent S(2)Sr3La2Cu octahedra, edges with two equivalent S(1)Sr2La2Cu2 pentagonal pyramids, and  a faceface with one S(3)Sr2La3Cu octahedra. The corner-sharing octahedral tilt angles range from 21-60°. In the second S site, S(2) is bonded to three equivalent Sr(1), two equivalent La(1), and one Cu(1) atom to form distorted SSr3La2Cu octahedra that share corners with eight equivalent S(3)Sr2La3Cu octahedra, corners with two equivalent S(1)Sr2La2Cu2 pentagonal pyramids,  an edgeedge with one S(3)Sr2La3Cu octahedra, edges with four equivalent S(2)Sr3La2Cu octahedra, edges with five equivalent S(1)Sr2La2Cu2 pentagonal pyramids, and  a faceface with one S(3)Sr2La3Cu octahedra. The corner-sharing octahedral tilt angles range from 22-55°. In the third S site, S(3) is bonded to two equivalent Sr(1), three equivalent La(1), and one Cu(1) atom to form distorted SSr2La3Cu octahedra that share corners with eight equivalent S(2)Sr3La2Cu octahedra, corners with five equivalent S(1)Sr2La2Cu2 pentagonal pyramids,  an edgeedge with one S(2)Sr3La2Cu octahedra, edges with four equivalent S(3)Sr2La3Cu octahedra, edges with two equivalent S(1)Sr2La2Cu2 pentagonal pyramids,  a faceface with one S(2)Sr3La2Cu octahedra, and  a faceface with one S(1)Sr2La2Cu2 pentagonal pyramid. The corner-sharing octahedral tilt angles range from 22-55°.
SrLaCuS3 crystallizes in the orthorhombic Pnma space group. Sr(1) is bonded in a 7-coordinate geometry to two equivalent S(1), two equivalent S(3), and three equivalent S(2) atoms. Both Sr(1)-S(1) bond lengths are 3.05 Å. Both Sr(1)-S(3) bond lengths are 3.17 Å. There is one shorter (3.04 Å) and two longer (3.07 Å) Sr(1)-S(2) bond lengths. La(1) is bonded to two equivalent S(1), two equivalent S(2), and three equivalent S(3) atoms to form distorted LaS7 pentagonal bipyramids that share corners with two equivalent La(1)S7 pentagonal bipyramids,  a cornercorner with one Cu(1)S4 tetrahedra, edges with four equivalent La(1)S7 pentagonal bipyramids, and edges with four equivalent Cu(1)S4 tetrahedra. There is one shorter (2.98 Å) and one longer (2.99 Å) La(1)-S(1) bond length. Both La(1)-S(2) bond lengths are 2.95 Å. There are two shorter (2.90 Å) and one longer (3.06 Å) La(1)-S(3) bond length. Cu(1) is bonded to one S(2), one S(3), and two equivalent S(1) atoms to form CuS4 tetrahedra that share  a cornercorner with one La(1)S7 pentagonal bipyramid, corners with two equivalent Cu(1)S4 tetrahedra, and edges with four equivalent La(1)S7 pentagonal bipyramids. The Cu(1)-S(2) bond length is 2.33 Å. The Cu(1)-S(3) bond length is 2.37 Å. Both Cu(1)-S(1) bond lengths are 2.36 Å. There are three inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Sr(1), two equivalent La(1), and two equivalent Cu(1) atoms to form distorted SSr2La2Cu2 pentagonal pyramids that share corners with two equivalent S(2)Sr3La2Cu octahedra, corners with five equivalent S(3)Sr2La3Cu octahedra, corners with two equivalent S(1)Sr2La2Cu2 pentagonal pyramids, edges with two equivalent S(3)Sr2La3Cu octahedra, edges with five equivalent S(2)Sr3La2Cu octahedra, edges with two equivalent S(1)Sr2La2Cu2 pentagonal pyramids, and  a faceface with one S(3)Sr2La3Cu octahedra. The corner-sharing octahedral tilt angles range from 21-60°. In the second S site, S(2) is bonded to three equivalent Sr(1), two equivalent La(1), and one Cu(1) atom to form distorted SSr3La2Cu octahedra that share corners with eight equivalent S(3)Sr2La3Cu octahedra, corners with two equivalent S(1)Sr2La2Cu2 pentagonal pyramids,  an edgeedge with one S(3)Sr2La3Cu octahedra, edges with four equivalent S(2)Sr3La2Cu octahedra, edges with five equivalent S(1)Sr2La2Cu2 pentagonal pyramids, and  a faceface with one S(3)Sr2La3Cu octahedra. The corner-sharing octahedral tilt angles range from 22-55°. In the third S site, S(3) is bonded to two equivalent Sr(1), three equivalent La(1), and one Cu(1) atom to form distorted SSr2La3Cu octahedra that share corners with eight equivalent S(2)Sr3La2Cu octahedra, corners with five equivalent S(1)Sr2La2Cu2 pentagonal pyramids,  an edgeedge with one S(2)Sr3La2Cu octahedra, edges with four equivalent S(3)Sr2La3Cu octahedra, edges with two equivalent S(1)Sr2La2Cu2 pentagonal pyramids,  a faceface with one S(2)Sr3La2Cu octahedra, and  a faceface with one S(1)Sr2La2Cu2 pentagonal pyramid. The corner-sharing octahedral tilt angles range from 22-55°.