Cu3Ga3(Te2Se)2 is Stannite-like structured and crystallizes in the monoclinic Cc space group. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one Te(3), two equivalent Te(4), and one Se(2) atom to form CuTe3Se tetrahedra that share  a cornercorner with one Cu(2)Te2Se2 tetrahedra,  a cornercorner with one Cu(3)Te3Se tetrahedra, corners with two equivalent Cu(1)Te3Se tetrahedra, corners with two equivalent Ga(1)Te3Se tetrahedra, corners with two equivalent Ga(2)Te4 tetrahedra, and corners with four equivalent Ga(3)TeSe3 tetrahedra. In the second Cu site, Cu(2) is bonded to one Te(1), one Te(3), and two equivalent Se(1) atoms to form CuTe2Se2 tetrahedra that share  a cornercorner with one Cu(1)Te3Se tetrahedra,  a cornercorner with one Cu(3)Te3Se tetrahedra, corners with two equivalent Cu(2)Te2Se2 tetrahedra, corners with two equivalent Ga(2)Te4 tetrahedra, corners with two equivalent Ga(3)TeSe3 tetrahedra, and corners with four equivalent Ga(1)Te3Se tetrahedra. In the third Cu site, Cu(3) is bonded to one Te(1), two equivalent Te(2), and one Se(2) atom to form CuTe3Se tetrahedra that share  a cornercorner with one Cu(2)Te2Se2 tetrahedra,  a cornercorner with one Cu(1)Te3Se tetrahedra, corners with two equivalent Cu(3)Te3Se tetrahedra, corners with two equivalent Ga(1)Te3Se tetrahedra, corners with two equivalent Ga(3)TeSe3 tetrahedra, and corners with four equivalent Ga(2)Te4 tetrahedra. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one Te(2), two equivalent Te(3), and one Se(1) atom to form GaTe3Se tetrahedra that share  a cornercorner with one Ga(2)Te4 tetrahedra,  a cornercorner with one Ga(3)TeSe3 tetrahedra, corners with two equivalent Cu(1)Te3Se tetrahedra, corners with two equivalent Cu(3)Te3Se tetrahedra, corners with two equivalent Ga(1)Te3Se tetrahedra, and corners with four equivalent Cu(2)Te2Se2 tetrahedra. In the second Ga site, Ga(2) is bonded to one Te(2), one Te(4), and two equivalent Te(1) atoms to form GaTe4 tetrahedra that share  a cornercorner with one Ga(1)Te3Se tetrahedra,  a cornercorner with one Ga(3)TeSe3 tetrahedra, corners with two equivalent Cu(2)Te2Se2 tetrahedra, corners with two equivalent Cu(1)Te3Se tetrahedra, corners with two equivalent Ga(2)Te4 tetrahedra, and corners with four equivalent Cu(3)Te3Se tetrahedra. In the third Ga site, Ga(3) is bonded to one Te(4), one Se(1), and two equivalent Se(2) atoms to form GaTeSe3 tetrahedra that share  a cornercorner with one Ga(1)Te3Se tetrahedra,  a cornercorner with one Ga(2)Te4 tetrahedra, corners with two equivalent Cu(2)Te2Se2 tetrahedra, corners with two equivalent Cu(3)Te3Se tetrahedra, corners with two equivalent Ga(3)TeSe3 tetrahedra, and corners with four equivalent Cu(1)Te3Se tetrahedra. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded to one Cu(2), one Cu(3), and two equivalent Ga(2) atoms to form TeGa2Cu2 tetrahedra that share  a cornercorner with one Te(3)Ga2Cu2 tetrahedra,  a cornercorner with one Se(2)Ga2Cu2 tetrahedra, corners with two equivalent Te(1)Ga2Cu2 tetrahedra, corners with two equivalent Te(4)Ga2Cu2 tetrahedra, corners with two equivalent Se(1)Ga2Cu2 tetrahedra, and corners with four equivalent Te(2)Ga2Cu2 tetrahedra. In the second Te site, Te(2) is bonded to two equivalent Cu(3), one Ga(1), and one Ga(2) atom to form TeGa2Cu2 tetrahedra that share  a cornercorner with one Te(4)Ga2Cu2 tetrahedra,  a cornercorner with one Se(1)Ga2Cu2 tetrahedra, corners with two equivalent Te(2)Ga2Cu2 tetrahedra, corners with two equivalent Te(3)Ga2Cu2 tetrahedra, corners with two equivalent Se(2)Ga2Cu2 tetrahedra, and corners with four equivalent Te(1)Ga2Cu2 tetrahedra. In the third Te site, Te(3) is bonded to one Cu(1), one Cu(2), and two equivalent Ga(1) atoms to form TeGa2Cu2 tetrahedra that share  a cornercorner with one Te(1)Ga2Cu2 tetrahedra,  a cornercorner with one Se(2)Ga2Cu2 tetrahedra, corners with two equivalent Te(2)Ga2Cu2 tetrahedra, corners with two equivalent Te(3)Ga2Cu2 tetrahedra, corners with two equivalent Te(4)Ga2Cu2 tetrahedra, and corners with four equivalent Se(1)Ga2Cu2 tetrahedra. In the fourth Te site, Te(4) is bonded to two equivalent Cu(1), one Ga(2), and one Ga(3) atom to form TeGa2Cu2 tetrahedra that share  a cornercorner with one Te(2)Ga2Cu2 tetrahedra,  a cornercorner with one Se(1)Ga2Cu2 tetrahedra, corners with two equivalent Te(1)Ga2Cu2 tetrahedra, corners with two equivalent Te(3)Ga2Cu2 tetrahedra, corners with two equivalent Te(4)Ga2Cu2 tetrahedra, and corners with four equivalent Se(2)Ga2Cu2 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Cu(2), one Ga(1), and one Ga(3) atom to form SeGa2Cu2 tetrahedra that share  a cornercorner with one Te(2)Ga2Cu2 tetrahedra,  a cornercorner with one Te(4)Ga2Cu2 tetrahedra, corners with two equivalent Te(1)Ga2Cu2 tetrahedra, corners with two equivalent Se(1)Ga2Cu2 tetrahedra, corners with two equivalent Se(2)Ga2Cu2 tetrahedra, and corners with four equivalent Te(3)Ga2Cu2 tetrahedra. In the second Se site, Se(2) is bonded to one Cu(1), one Cu(3), and two equivalent Ga(3) atoms to form SeGa2Cu2 tetrahedra that share  a cornercorner with one Te(1)Ga2Cu2 tetrahedra,  a cornercorner with one Te(3)Ga2Cu2 tetrahedra, corners with two equivalent Te(2)Ga2Cu2 tetrahedra, corners with two equivalent Se(1)Ga2Cu2 tetrahedra, corners with two equivalent Se(2)Ga2Cu2 tetrahedra, and corners with four equivalent Te(4)Ga2Cu2 tetrahedra.
Cu3Ga3(Te2Se)2 is Stannite-like structured and crystallizes in the monoclinic Cc space group. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one Te(3), two equivalent Te(4), and one Se(2) atom to form CuTe3Se tetrahedra that share  a cornercorner with one Cu(2)Te2Se2 tetrahedra,  a cornercorner with one Cu(3)Te3Se tetrahedra, corners with two equivalent Cu(1)Te3Se tetrahedra, corners with two equivalent Ga(1)Te3Se tetrahedra, corners with two equivalent Ga(2)Te4 tetrahedra, and corners with four equivalent Ga(3)TeSe3 tetrahedra. The Cu(1)-Te(3) bond length is 2.57 Å. There is one shorter (2.59 Å) and one longer (2.60 Å) Cu(1)-Te(4) bond length. The Cu(1)-Se(2) bond length is 2.47 Å. In the second Cu site, Cu(2) is bonded to one Te(1), one Te(3), and two equivalent Se(1) atoms to form CuTe2Se2 tetrahedra that share  a cornercorner with one Cu(1)Te3Se tetrahedra,  a cornercorner with one Cu(3)Te3Se tetrahedra, corners with two equivalent Cu(2)Te2Se2 tetrahedra, corners with two equivalent Ga(2)Te4 tetrahedra, corners with two equivalent Ga(3)TeSe3 tetrahedra, and corners with four equivalent Ga(1)Te3Se tetrahedra. The Cu(2)-Te(1) bond length is 2.60 Å. The Cu(2)-Te(3) bond length is 2.63 Å. There is one shorter (2.44 Å) and one longer (2.46 Å) Cu(2)-Se(1) bond length. In the third Cu site, Cu(3) is bonded to one Te(1), two equivalent Te(2), and one Se(2) atom to form CuTe3Se tetrahedra that share  a cornercorner with one Cu(2)Te2Se2 tetrahedra,  a cornercorner with one Cu(1)Te3Se tetrahedra, corners with two equivalent Cu(3)Te3Se tetrahedra, corners with two equivalent Ga(1)Te3Se tetrahedra, corners with two equivalent Ga(3)TeSe3 tetrahedra, and corners with four equivalent Ga(2)Te4 tetrahedra. The Cu(3)-Te(1) bond length is 2.60 Å. There is one shorter (2.57 Å) and one longer (2.58 Å) Cu(3)-Te(2) bond length. The Cu(3)-Se(2) bond length is 2.44 Å. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one Te(2), two equivalent Te(3), and one Se(1) atom to form GaTe3Se tetrahedra that share  a cornercorner with one Ga(2)Te4 tetrahedra,  a cornercorner with one Ga(3)TeSe3 tetrahedra, corners with two equivalent Cu(1)Te3Se tetrahedra, corners with two equivalent Cu(3)Te3Se tetrahedra, corners with two equivalent Ga(1)Te3Se tetrahedra, and corners with four equivalent Cu(2)Te2Se2 tetrahedra. The Ga(1)-Te(2) bond length is 2.68 Å. There is one shorter (2.67 Å) and one longer (2.69 Å) Ga(1)-Te(3) bond length. The Ga(1)-Se(1) bond length is 2.52 Å. In the second Ga site, Ga(2) is bonded to one Te(2), one Te(4), and two equivalent Te(1) atoms to form GaTe4 tetrahedra that share  a cornercorner with one Ga(1)Te3Se tetrahedra,  a cornercorner with one Ga(3)TeSe3 tetrahedra, corners with two equivalent Cu(2)Te2Se2 tetrahedra, corners with two equivalent Cu(1)Te3Se tetrahedra, corners with two equivalent Ga(2)Te4 tetrahedra, and corners with four equivalent Cu(3)Te3Se tetrahedra. The Ga(2)-Te(2) bond length is 2.65 Å. The Ga(2)-Te(4) bond length is 2.64 Å. There is one shorter (2.64 Å) and one longer (2.65 Å) Ga(2)-Te(1) bond length. In the third Ga site, Ga(3) is bonded to one Te(4), one Se(1), and two equivalent Se(2) atoms to form GaTeSe3 tetrahedra that share  a cornercorner with one Ga(1)Te3Se tetrahedra,  a cornercorner with one Ga(2)Te4 tetrahedra, corners with two equivalent Cu(2)Te2Se2 tetrahedra, corners with two equivalent Cu(3)Te3Se tetrahedra, corners with two equivalent Ga(3)TeSe3 tetrahedra, and corners with four equivalent Cu(1)Te3Se tetrahedra. The Ga(3)-Te(4) bond length is 2.69 Å. The Ga(3)-Se(1) bond length is 2.50 Å. There is one shorter (2.51 Å) and one longer (2.52 Å) Ga(3)-Se(2) bond length. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded to one Cu(2), one Cu(3), and two equivalent Ga(2) atoms to form TeGa2Cu2 tetrahedra that share  a cornercorner with one Te(3)Ga2Cu2 tetrahedra,  a cornercorner with one Se(2)Ga2Cu2 tetrahedra, corners with two equivalent Te(1)Ga2Cu2 tetrahedra, corners with two equivalent Te(4)Ga2Cu2 tetrahedra, corners with two equivalent Se(1)Ga2Cu2 tetrahedra, and corners with four equivalent Te(2)Ga2Cu2 tetrahedra. In the second Te site, Te(2) is bonded to two equivalent Cu(3), one Ga(1), and one Ga(2) atom to form TeGa2Cu2 tetrahedra that share  a cornercorner with one Te(4)Ga2Cu2 tetrahedra,  a cornercorner with one Se(1)Ga2Cu2 tetrahedra, corners with two equivalent Te(2)Ga2Cu2 tetrahedra, corners with two equivalent Te(3)Ga2Cu2 tetrahedra, corners with two equivalent Se(2)Ga2Cu2 tetrahedra, and corners with four equivalent Te(1)Ga2Cu2 tetrahedra. In the third Te site, Te(3) is bonded to one Cu(1), one Cu(2), and two equivalent Ga(1) atoms to form TeGa2Cu2 tetrahedra that share  a cornercorner with one Te(1)Ga2Cu2 tetrahedra,  a cornercorner with one Se(2)Ga2Cu2 tetrahedra, corners with two equivalent Te(2)Ga2Cu2 tetrahedra, corners with two equivalent Te(3)Ga2Cu2 tetrahedra, corners with two equivalent Te(4)Ga2Cu2 tetrahedra, and corners with four equivalent Se(1)Ga2Cu2 tetrahedra. In the fourth Te site, Te(4) is bonded to two equivalent Cu(1), one Ga(2), and one Ga(3) atom to form TeGa2Cu2 tetrahedra that share  a cornercorner with one Te(2)Ga2Cu2 tetrahedra,  a cornercorner with one Se(1)Ga2Cu2 tetrahedra, corners with two equivalent Te(1)Ga2Cu2 tetrahedra, corners with two equivalent Te(3)Ga2Cu2 tetrahedra, corners with two equivalent Te(4)Ga2Cu2 tetrahedra, and corners with four equivalent Se(2)Ga2Cu2 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Cu(2), one Ga(1), and one Ga(3) atom to form SeGa2Cu2 tetrahedra that share  a cornercorner with one Te(2)Ga2Cu2 tetrahedra,  a cornercorner with one Te(4)Ga2Cu2 tetrahedra, corners with two equivalent Te(1)Ga2Cu2 tetrahedra, corners with two equivalent Se(1)Ga2Cu2 tetrahedra, corners with two equivalent Se(2)Ga2Cu2 tetrahedra, and corners with four equivalent Te(3)Ga2Cu2 tetrahedra. In the second Se site, Se(2) is bonded to one Cu(1), one Cu(3), and two equivalent Ga(3) atoms to form SeGa2Cu2 tetrahedra that share  a cornercorner with one Te(1)Ga2Cu2 tetrahedra,  a cornercorner with one Te(3)Ga2Cu2 tetrahedra, corners with two equivalent Te(2)Ga2Cu2 tetrahedra, corners with two equivalent Se(1)Ga2Cu2 tetrahedra, corners with two equivalent Se(2)Ga2Cu2 tetrahedra, and corners with four equivalent Te(4)Ga2Cu2 tetrahedra.