Fe3ZnO7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(2) atoms to form distorted FeO5 trigonal bipyramids that share corners with three equivalent Zn(1)O5 square pyramids, corners with two equivalent Fe(2)O5 trigonal bipyramids,  an edgeedge with one Fe(2)O5 trigonal bipyramid, and edges with two equivalent Fe(1)O5 trigonal bipyramids. In the second Fe site, Fe(2) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Zn(1)O5 square pyramid, corners with four equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Zn(1)O5 square pyramid, and edges with two equivalent Fe(1)O5 trigonal bipyramids. Zn(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted ZnO5 square pyramids that share  a cornercorner with one Fe(2)O5 trigonal bipyramid, corners with six equivalent Fe(1)O5 trigonal bipyramids, and  an edgeedge with one Fe(2)O5 trigonal bipyramid. There are four inequivalent O sites. In the first O site, O(3) is bonded in a bent 120 degrees geometry to one Fe(2) and one Zn(1) atom. In the second O site, O(4) is bonded in a bent 120 degrees geometry to one Fe(1) and one Zn(1) atom. In the third O site, O(1) is bonded to one Fe(2), two equivalent Fe(1), and one Zn(1) atom to form a mixture of distorted edge and corner-sharing OZnFe3 trigonal pyramids. In the fourth O site, O(2) is bonded in a trigonal non-coplanar geometry to one Fe(2) and two equivalent Fe(1) atoms.
Fe3ZnO7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(2) atoms to form distorted FeO5 trigonal bipyramids that share corners with three equivalent Zn(1)O5 square pyramids, corners with two equivalent Fe(2)O5 trigonal bipyramids,  an edgeedge with one Fe(2)O5 trigonal bipyramid, and edges with two equivalent Fe(1)O5 trigonal bipyramids. The Fe(1)-O(4) bond length is 1.80 Å. There is one shorter (2.01 Å) and one longer (2.08 Å) Fe(1)-O(1) bond length. There is one shorter (1.95 Å) and one longer (2.00 Å) Fe(1)-O(2) bond length. In the second Fe site, Fe(2) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Zn(1)O5 square pyramid, corners with four equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Zn(1)O5 square pyramid, and edges with two equivalent Fe(1)O5 trigonal bipyramids. The Fe(2)-O(3) bond length is 1.78 Å. Both Fe(2)-O(1) bond lengths are 1.95 Å. Both Fe(2)-O(2) bond lengths are 1.93 Å. Zn(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted ZnO5 square pyramids that share  a cornercorner with one Fe(2)O5 trigonal bipyramid, corners with six equivalent Fe(1)O5 trigonal bipyramids, and  an edgeedge with one Fe(2)O5 trigonal bipyramid. The Zn(1)-O(3) bond length is 1.95 Å. Both Zn(1)-O(1) bond lengths are 2.21 Å. Both Zn(1)-O(4) bond lengths are 1.96 Å. There are four inequivalent O sites. In the first O site, O(3) is bonded in a bent 120 degrees geometry to one Fe(2) and one Zn(1) atom. In the second O site, O(4) is bonded in a bent 120 degrees geometry to one Fe(1) and one Zn(1) atom. In the third O site, O(1) is bonded to one Fe(2), two equivalent Fe(1), and one Zn(1) atom to form a mixture of distorted edge and corner-sharing OZnFe3 trigonal pyramids. In the fourth O site, O(2) is bonded in a trigonal non-coplanar geometry to one Fe(2) and two equivalent Fe(1) atoms.