CaLaGa3S7 crystallizes in the monoclinic P2_1 space group. Ca(1) is bonded in a 8-coordinate geometry to one S(2), one S(3), one S(4), one S(5), two equivalent S(1), and two equivalent S(7) atoms. La(1) is bonded in a 8-coordinate geometry to one S(1), one S(3), one S(4), one S(5), two equivalent S(2), and two equivalent S(6) atoms. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one S(4), one S(5), one S(6), and one S(7) atom to form corner-sharing GaS4 tetrahedra. In the second Ga site, Ga(2) is bonded to one S(2), one S(3), one S(5), and one S(6) atom to form distorted corner-sharing GaS4 trigonal pyramids. In the third Ga site, Ga(3) is bonded to one S(1), one S(3), one S(4), and one S(7) atom to form corner-sharing GaS4 trigonal pyramids. There are seven inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Ca(1), one La(1), and one Ga(3) atom to form SCa2LaGa tetrahedra that share corners with two equivalent S(1)Ca2LaGa tetrahedra, corners with two equivalent S(2)CaLa2Ga tetrahedra, corners with two equivalent S(3)CaLaGa2 tetrahedra,  an edgeedge with one S(2)CaLa2Ga tetrahedra, and  an edgeedge with one S(3)CaLaGa2 tetrahedra. In the second S site, S(2) is bonded to one Ca(1), two equivalent La(1), and one Ga(2) atom to form SCaLa2Ga tetrahedra that share corners with two equivalent S(1)Ca2LaGa tetrahedra, corners with two equivalent S(2)CaLa2Ga tetrahedra, corners with two equivalent S(3)CaLaGa2 tetrahedra,  an edgeedge with one S(1)Ca2LaGa tetrahedra, and  an edgeedge with one S(3)CaLaGa2 tetrahedra. In the third S site, S(3) is bonded to one Ca(1), one La(1), one Ga(2), and one Ga(3) atom to form SCaLaGa2 tetrahedra that share corners with two equivalent S(1)Ca2LaGa tetrahedra, corners with two equivalent S(2)CaLa2Ga tetrahedra,  an edgeedge with one S(1)Ca2LaGa tetrahedra, and  an edgeedge with one S(2)CaLa2Ga tetrahedra. In the fourth S site, S(4) is bonded in a 4-coordinate geometry to one Ca(1), one La(1), one Ga(1), and one Ga(3) atom. In the fifth S site, S(5) is bonded in a 4-coordinate geometry to one Ca(1), one La(1), one Ga(1), and one Ga(2) atom. In the sixth S site, S(6) is bonded in a 4-coordinate geometry to two equivalent La(1), one Ga(1), and one Ga(2) atom. In the seventh S site, S(7) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Ga(1), and one Ga(3) atom.
CaLaGa3S7 crystallizes in the monoclinic P2_1 space group. Ca(1) is bonded in a 8-coordinate geometry to one S(2), one S(3), one S(4), one S(5), two equivalent S(1), and two equivalent S(7) atoms. The Ca(1)-S(2) bond length is 3.13 Å. The Ca(1)-S(3) bond length is 2.84 Å. The Ca(1)-S(4) bond length is 2.96 Å. The Ca(1)-S(5) bond length is 3.43 Å. There is one shorter (3.04 Å) and one longer (3.08 Å) Ca(1)-S(1) bond length. There is one shorter (2.97 Å) and one longer (3.40 Å) Ca(1)-S(7) bond length. La(1) is bonded in a 8-coordinate geometry to one S(1), one S(3), one S(4), one S(5), two equivalent S(2), and two equivalent S(6) atoms. The La(1)-S(1) bond length is 3.01 Å. The La(1)-S(3) bond length is 2.87 Å. The La(1)-S(4) bond length is 3.34 Å. The La(1)-S(5) bond length is 2.99 Å. There is one shorter (3.04 Å) and one longer (3.07 Å) La(1)-S(2) bond length. There is one shorter (2.99 Å) and one longer (3.37 Å) La(1)-S(6) bond length. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one S(4), one S(5), one S(6), and one S(7) atom to form corner-sharing GaS4 tetrahedra. The Ga(1)-S(4) bond length is 2.27 Å. The Ga(1)-S(5) bond length is 2.28 Å. The Ga(1)-S(6) bond length is 2.29 Å. The Ga(1)-S(7) bond length is 2.26 Å. In the second Ga site, Ga(2) is bonded to one S(2), one S(3), one S(5), and one S(6) atom to form distorted corner-sharing GaS4 trigonal pyramids. The Ga(2)-S(2) bond length is 2.22 Å. The Ga(2)-S(3) bond length is 2.28 Å. The Ga(2)-S(5) bond length is 2.30 Å. The Ga(2)-S(6) bond length is 2.32 Å. In the third Ga site, Ga(3) is bonded to one S(1), one S(3), one S(4), and one S(7) atom to form corner-sharing GaS4 trigonal pyramids. The Ga(3)-S(1) bond length is 2.22 Å. The Ga(3)-S(3) bond length is 2.31 Å. The Ga(3)-S(4) bond length is 2.31 Å. The Ga(3)-S(7) bond length is 2.29 Å. There are seven inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Ca(1), one La(1), and one Ga(3) atom to form SCa2LaGa tetrahedra that share corners with two equivalent S(1)Ca2LaGa tetrahedra, corners with two equivalent S(2)CaLa2Ga tetrahedra, corners with two equivalent S(3)CaLaGa2 tetrahedra,  an edgeedge with one S(2)CaLa2Ga tetrahedra, and  an edgeedge with one S(3)CaLaGa2 tetrahedra. In the second S site, S(2) is bonded to one Ca(1), two equivalent La(1), and one Ga(2) atom to form SCaLa2Ga tetrahedra that share corners with two equivalent S(1)Ca2LaGa tetrahedra, corners with two equivalent S(2)CaLa2Ga tetrahedra, corners with two equivalent S(3)CaLaGa2 tetrahedra,  an edgeedge with one S(1)Ca2LaGa tetrahedra, and  an edgeedge with one S(3)CaLaGa2 tetrahedra. In the third S site, S(3) is bonded to one Ca(1), one La(1), one Ga(2), and one Ga(3) atom to form SCaLaGa2 tetrahedra that share corners with two equivalent S(1)Ca2LaGa tetrahedra, corners with two equivalent S(2)CaLa2Ga tetrahedra,  an edgeedge with one S(1)Ca2LaGa tetrahedra, and  an edgeedge with one S(2)CaLa2Ga tetrahedra. In the fourth S site, S(4) is bonded in a 4-coordinate geometry to one Ca(1), one La(1), one Ga(1), and one Ga(3) atom. In the fifth S site, S(5) is bonded in a 4-coordinate geometry to one Ca(1), one La(1), one Ga(1), and one Ga(2) atom. In the sixth S site, S(6) is bonded in a 4-coordinate geometry to two equivalent La(1), one Ga(1), and one Ga(2) atom. In the seventh S site, S(7) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Ga(1), and one Ga(3) atom.