FeSb2O6 is Hydrophilite-derived structured and crystallizes in the tetragonal P4_2/mnm space group. Fe(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form FeO6 octahedra that share corners with eight equivalent Sb(1)O6 octahedra and edges with two equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-52°. Sb(1) is bonded to two equivalent O(1) and four equivalent O(2) 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(1)O6 octahedra, and  an edgeedge with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. There are two inequivalent O sites. In the first O site, O(2) is bonded in a trigonal planar geometry to one Fe(1) and two equivalent Sb(1) atoms. In the second O site, O(1) is bonded in a trigonal planar geometry to one Fe(1) and two equivalent Sb(1) atoms.
FeSb2O6 is Hydrophilite-derived structured and crystallizes in the tetragonal P4_2/mnm space group. Fe(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form FeO6 octahedra that share corners with eight equivalent Sb(1)O6 octahedra and edges with two equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-52°. Both Fe(1)-O(1) bond lengths are 2.05 Å. All Fe(1)-O(2) bond lengths are 2.08 Å. Sb(1) is bonded to two equivalent O(1) and four equivalent O(2) 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(1)O6 octahedra, and  an edgeedge with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. Both Sb(1)-O(1) bond lengths are 2.02 Å. All Sb(1)-O(2) bond lengths are 2.00 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a trigonal planar geometry to one Fe(1) and two equivalent Sb(1) atoms. In the second O site, O(1) is bonded in a trigonal planar geometry to one Fe(1) and two equivalent Sb(1) atoms.