FeNbO4 is Hydrophilite-derived structured and crystallizes in the orthorhombic Pna2_1 space group. Nb(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form distorted NbO6 octahedra that share corners with four equivalent Nb(1)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-58°. Fe(1) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form FeO6 octahedra that share corners with four equivalent Nb(1)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, and edges with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-55°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Nb(1) and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Nb(1) and one Fe(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Nb(1) and one Fe(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Nb(1) and two equivalent Fe(1) atoms.
FeNbO4 is Hydrophilite-derived structured and crystallizes in the orthorhombic Pna2_1 space group. Nb(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form distorted NbO6 octahedra that share corners with four equivalent Nb(1)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-58°. The Nb(1)-O(1) bond length is 1.92 Å. The Nb(1)-O(4) bond length is 2.04 Å. There is one shorter (1.95 Å) and one longer (2.26 Å) Nb(1)-O(2) bond length. There is one shorter (1.94 Å) and one longer (2.14 Å) Nb(1)-O(3) bond length. Fe(1) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form FeO6 octahedra that share corners with four equivalent Nb(1)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, and edges with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-55°. The Fe(1)-O(2) bond length is 2.03 Å. The Fe(1)-O(3) bond length is 2.13 Å. There is one shorter (2.02 Å) and one longer (2.15 Å) Fe(1)-O(1) bond length. There is one shorter (1.95 Å) and one longer (2.04 Å) Fe(1)-O(4) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Nb(1) and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Nb(1) and one Fe(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Nb(1) and one Fe(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Nb(1) and two equivalent Fe(1) atoms.