Zn2Sn2O5 crystallizes in the orthorhombic Pmc2_1 space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(4), one O(5), and two equivalent O(3) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with two equivalent Sn(2)O5 trigonal bipyramids, and  an edgeedge with one Zn(2)O4 tetrahedra. In the second Zn site, Zn(2) is bonded to one O(4), one O(5), and two equivalent O(2) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(2)O4 tetrahedra, corners with six equivalent Sn(2)O5 trigonal bipyramids, and  an edgeedge with one Zn(1)O4 tetrahedra. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(3), and two equivalent O(5) atoms. In the second Sn site, Sn(2) is bonded to one O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted SnO5 trigonal bipyramids that share corners with two equivalent Zn(1)O4 tetrahedra, corners with six equivalent Zn(2)O4 tetrahedra, and corners with four equivalent Sn(2)O5 trigonal bipyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Sn(1) and one Sn(2) atom. In the second O site, O(2) is bonded to two equivalent Zn(2) and two equivalent Sn(2) atoms to form distorted corner-sharing OZn2Sn2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Zn(1) and two equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded to one Zn(1), one Zn(2), and two equivalent Sn(2) atoms to form a mixture of corner and edge-sharing OZn2Sn2 tetrahedra. In the fifth O site, O(5) is bonded to one Zn(1), one Zn(2), and two equivalent Sn(1) atoms to form a mixture of corner and edge-sharing OZn2Sn2 tetrahedra.
Zn2Sn2O5 crystallizes in the orthorhombic Pmc2_1 space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(4), one O(5), and two equivalent O(3) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with two equivalent Sn(2)O5 trigonal bipyramids, and  an edgeedge with one Zn(2)O4 tetrahedra. The Zn(1)-O(4) bond length is 2.13 Å. The Zn(1)-O(5) bond length is 2.11 Å. Both Zn(1)-O(3) bond lengths are 2.04 Å. In the second Zn site, Zn(2) is bonded to one O(4), one O(5), and two equivalent O(2) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(2)O4 tetrahedra, corners with six equivalent Sn(2)O5 trigonal bipyramids, and  an edgeedge with one Zn(1)O4 tetrahedra. The Zn(2)-O(4) bond length is 2.07 Å. The Zn(2)-O(5) bond length is 2.16 Å. Both Zn(2)-O(2) bond lengths are 2.02 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(3), and two equivalent O(5) atoms. The Sn(1)-O(1) bond length is 2.01 Å. There is one shorter (2.12 Å) and one longer (2.65 Å) Sn(1)-O(3) bond length. Both Sn(1)-O(5) bond lengths are 2.17 Å. In the second Sn site, Sn(2) is bonded to one O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted SnO5 trigonal bipyramids that share corners with two equivalent Zn(1)O4 tetrahedra, corners with six equivalent Zn(2)O4 tetrahedra, and corners with four equivalent Sn(2)O5 trigonal bipyramids. The Sn(2)-O(1) bond length is 2.04 Å. There is one shorter (2.18 Å) and one longer (2.56 Å) Sn(2)-O(2) bond length. Both Sn(2)-O(4) bond lengths are 2.20 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Sn(1) and one Sn(2) atom. In the second O site, O(2) is bonded to two equivalent Zn(2) and two equivalent Sn(2) atoms to form distorted corner-sharing OZn2Sn2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Zn(1) and two equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded to one Zn(1), one Zn(2), and two equivalent Sn(2) atoms to form a mixture of corner and edge-sharing OZn2Sn2 tetrahedra. In the fifth O site, O(5) is bonded to one Zn(1), one Zn(2), and two equivalent Sn(1) atoms to form a mixture of corner and edge-sharing OZn2Sn2 tetrahedra.