FeSbO4 is Hydrophilite-derived structured and crystallizes in the orthorhombic Cmm2 space group. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with four equivalent Sb(2)O6 octahedra, corners with four equivalent Sb(3)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, and  an edgeedge with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-55°. In the second Fe site, Fe(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with four equivalent Fe(3)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, and  an edgeedge with one Sb(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-55°. In the third Fe site, Fe(3) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with four equivalent Fe(2)O6 octahedra, corners with four equivalent Sb(2)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, and  an edgeedge with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-51°. There are three inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form SbO6 octahedra that share corners with four equivalent Fe(2)O6 octahedra, corners with four equivalent Sb(3)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, and  an edgeedge with one Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-55°. In the second Sb site, Sb(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form SbO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra, corners with four equivalent Fe(3)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Sb(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-55°. In the third Sb site, Sb(3) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form SbO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-54°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Fe(1), one Sb(2), and one Sb(3) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Fe(2), one Fe(3), and one Sb(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(3), and one Sb(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Fe(1), one Sb(1), and one Sb(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Fe(2), one Sb(1), and one Sb(3) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(3), and one Sb(2) atom.
FeSbO4 is Hydrophilite-derived structured and crystallizes in the orthorhombic Cmm2 space group. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with four equivalent Sb(2)O6 octahedra, corners with four equivalent Sb(3)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, and  an edgeedge with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-55°. Both Fe(1)-O(1) bond lengths are 2.02 Å. Both Fe(1)-O(4) bond lengths are 2.11 Å. Both Fe(1)-O(6) bond lengths are 1.92 Å. In the second Fe site, Fe(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with four equivalent Fe(3)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, and  an edgeedge with one Sb(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-55°. Both Fe(2)-O(2) bond lengths are 2.00 Å. Both Fe(2)-O(3) bond lengths are 1.97 Å. Both Fe(2)-O(5) bond lengths are 2.07 Å. In the third Fe site, Fe(3) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with four equivalent Fe(2)O6 octahedra, corners with four equivalent Sb(2)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, and  an edgeedge with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-51°. Both Fe(3)-O(2) bond lengths are 1.94 Å. Both Fe(3)-O(3) bond lengths are 1.94 Å. Both Fe(3)-O(6) bond lengths are 1.95 Å. There are three inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form SbO6 octahedra that share corners with four equivalent Fe(2)O6 octahedra, corners with four equivalent Sb(3)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, and  an edgeedge with one Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-55°. Both Sb(1)-O(2) bond lengths are 1.96 Å. Both Sb(1)-O(4) bond lengths are 2.01 Å. Both Sb(1)-O(5) bond lengths are 2.00 Å. In the second Sb site, Sb(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form SbO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra, corners with four equivalent Fe(3)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Sb(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-55°. Both Sb(2)-O(1) bond lengths are 2.03 Å. Both Sb(2)-O(3) bond lengths are 1.97 Å. Both Sb(2)-O(6) bond lengths are 1.98 Å. In the third Sb site, Sb(3) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form SbO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-54°. Both Sb(3)-O(1) bond lengths are 1.98 Å. Both Sb(3)-O(4) bond lengths are 1.99 Å. Both Sb(3)-O(5) bond lengths are 1.97 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Fe(1), one Sb(2), and one Sb(3) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Fe(2), one Fe(3), and one Sb(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(3), and one Sb(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Fe(1), one Sb(1), and one Sb(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Fe(2), one Sb(1), and one Sb(3) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(3), and one Sb(2) atom.