Sr2ZnGe2S6O crystallizes in the tetragonal P-42_1m space group. Sr(1) is bonded in a 8-coordinate geometry to three equivalent S(2), four equivalent S(1), and one O(1) atom. Zn(1) is bonded to four equivalent S(1) atoms to form ZnS4 tetrahedra that share corners with four equivalent Ge(1)S3O tetrahedra. Ge(1) is bonded to one S(2), two equivalent S(1), and one O(1) atom to form distorted GeS3O tetrahedra that share  a cornercorner with one Ge(1)S3O tetrahedra and corners with two equivalent Zn(1)S4 tetrahedra. There are two inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Sr(1), one Zn(1), and one Ge(1) atom to form distorted SSr2ZnGe trigonal pyramids that share  a cornercorner with one O(1)Sr2Ge2 tetrahedra, corners with five equivalent S(2)Sr3Ge tetrahedra, corners with eight equivalent S(1)Sr2ZnGe trigonal pyramids,  an edgeedge with one S(2)Sr3Ge tetrahedra,  an edgeedge with one O(1)Sr2Ge2 tetrahedra, and  an edgeedge with one S(1)Sr2ZnGe trigonal pyramid. In the second S site, S(2) is bonded to three equivalent Sr(1) and one Ge(1) atom to form distorted SSr3Ge tetrahedra that share corners with two equivalent O(1)Sr2Ge2 tetrahedra, corners with four equivalent S(2)Sr3Ge tetrahedra, corners with ten equivalent S(1)Sr2ZnGe trigonal pyramids,  an edgeedge with one S(2)Sr3Ge tetrahedra,  an edgeedge with one O(1)Sr2Ge2 tetrahedra, and edges with two equivalent S(1)Sr2ZnGe trigonal pyramids. O(1) is bonded to two equivalent Sr(1) and two equivalent Ge(1) atoms to form distorted OSr2Ge2 tetrahedra that share corners with four equivalent S(2)Sr3Ge tetrahedra, corners with four equivalent S(1)Sr2ZnGe trigonal pyramids, edges with two equivalent S(2)Sr3Ge tetrahedra, and edges with four equivalent S(1)Sr2ZnGe trigonal pyramids.
Sr2ZnGe2S6O crystallizes in the tetragonal P-42_1m space group. Sr(1) is bonded in a 8-coordinate geometry to three equivalent S(2), four equivalent S(1), and one O(1) atom. There is one shorter (3.12 Å) and two longer (3.14 Å) Sr(1)-S(2) bond lengths. There are two shorter (3.09 Å) and two longer (3.11 Å) Sr(1)-S(1) bond lengths. The Sr(1)-O(1) bond length is 2.91 Å. Zn(1) is bonded to four equivalent S(1) atoms to form ZnS4 tetrahedra that share corners with four equivalent Ge(1)S3O tetrahedra. All Zn(1)-S(1) bond lengths are 2.34 Å. Ge(1) is bonded to one S(2), two equivalent S(1), and one O(1) atom to form distorted GeS3O tetrahedra that share  a cornercorner with one Ge(1)S3O tetrahedra and corners with two equivalent Zn(1)S4 tetrahedra. The Ge(1)-S(2) bond length is 2.17 Å. Both Ge(1)-S(1) bond lengths are 2.24 Å. The Ge(1)-O(1) bond length is 1.86 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Sr(1), one Zn(1), and one Ge(1) atom to form distorted SSr2ZnGe trigonal pyramids that share  a cornercorner with one O(1)Sr2Ge2 tetrahedra, corners with five equivalent S(2)Sr3Ge tetrahedra, corners with eight equivalent S(1)Sr2ZnGe trigonal pyramids,  an edgeedge with one S(2)Sr3Ge tetrahedra,  an edgeedge with one O(1)Sr2Ge2 tetrahedra, and  an edgeedge with one S(1)Sr2ZnGe trigonal pyramid. In the second S site, S(2) is bonded to three equivalent Sr(1) and one Ge(1) atom to form distorted SSr3Ge tetrahedra that share corners with two equivalent O(1)Sr2Ge2 tetrahedra, corners with four equivalent S(2)Sr3Ge tetrahedra, corners with ten equivalent S(1)Sr2ZnGe trigonal pyramids,  an edgeedge with one S(2)Sr3Ge tetrahedra,  an edgeedge with one O(1)Sr2Ge2 tetrahedra, and edges with two equivalent S(1)Sr2ZnGe trigonal pyramids. O(1) is bonded to two equivalent Sr(1) and two equivalent Ge(1) atoms to form distorted OSr2Ge2 tetrahedra that share corners with four equivalent S(2)Sr3Ge tetrahedra, corners with four equivalent S(1)Sr2ZnGe trigonal pyramids, edges with two equivalent S(2)Sr3Ge tetrahedra, and edges with four equivalent S(1)Sr2ZnGe trigonal pyramids.