Ag2Ga2TeSe3 is Stannite-like structured and crystallizes in the monoclinic C2 space group. Ag(1) is bonded to one Te(1), one Se(1), and two equivalent Se(2) atoms to form AgTeSe3 tetrahedra that share corners with four equivalent Ag(1)TeSe3 tetrahedra and corners with eight equivalent Ga(1)TeSe3 tetrahedra. Ga(1) is bonded to one Te(1), one Se(1), and two equivalent Se(2) atoms to form GaTeSe3 tetrahedra that share corners with four equivalent Ga(1)TeSe3 tetrahedra and corners with eight equivalent Ag(1)TeSe3 tetrahedra. Te(1) is bonded to two equivalent Ag(1) and two equivalent Ga(1) atoms to form TeGa2Ag2 tetrahedra that share corners with four equivalent Se(1)Ga2Ag2 tetrahedra and corners with eight equivalent Se(2)Ga2Ag2 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Ag(1) and two equivalent Ga(1) atoms to form SeGa2Ag2 tetrahedra that share corners with four equivalent Te(1)Ga2Ag2 tetrahedra and corners with eight equivalent Se(2)Ga2Ag2 tetrahedra. In the second Se site, Se(2) is bonded to two equivalent Ag(1) and two equivalent Ga(1) atoms to form SeGa2Ag2 tetrahedra that share corners with four equivalent Te(1)Ga2Ag2 tetrahedra, corners with four equivalent Se(1)Ga2Ag2 tetrahedra, and corners with four equivalent Se(2)Ga2Ag2 tetrahedra.
Ag2Ga2TeSe3 is Stannite-like structured and crystallizes in the monoclinic C2 space group. Ag(1) is bonded to one Te(1), one Se(1), and two equivalent Se(2) atoms to form AgTeSe3 tetrahedra that share corners with four equivalent Ag(1)TeSe3 tetrahedra and corners with eight equivalent Ga(1)TeSe3 tetrahedra. The Ag(1)-Te(1) bond length is 2.75 Å. The Ag(1)-Se(1) bond length is 2.67 Å. There is one shorter (2.70 Å) and one longer (2.71 Å) Ag(1)-Se(2) bond length. Ga(1) is bonded to one Te(1), one Se(1), and two equivalent Se(2) atoms to form GaTeSe3 tetrahedra that share corners with four equivalent Ga(1)TeSe3 tetrahedra and corners with eight equivalent Ag(1)TeSe3 tetrahedra. The Ga(1)-Te(1) bond length is 2.64 Å. The Ga(1)-Se(1) bond length is 2.47 Å. There is one shorter (2.47 Å) and one longer (2.48 Å) Ga(1)-Se(2) bond length. Te(1) is bonded to two equivalent Ag(1) and two equivalent Ga(1) atoms to form TeGa2Ag2 tetrahedra that share corners with four equivalent Se(1)Ga2Ag2 tetrahedra and corners with eight equivalent Se(2)Ga2Ag2 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Ag(1) and two equivalent Ga(1) atoms to form SeGa2Ag2 tetrahedra that share corners with four equivalent Te(1)Ga2Ag2 tetrahedra and corners with eight equivalent Se(2)Ga2Ag2 tetrahedra. In the second Se site, Se(2) is bonded to two equivalent Ag(1) and two equivalent Ga(1) atoms to form SeGa2Ag2 tetrahedra that share corners with four equivalent Te(1)Ga2Ag2 tetrahedra, corners with four equivalent Se(1)Ga2Ag2 tetrahedra, and corners with four equivalent Se(2)Ga2Ag2 tetrahedra.