Fe10O9F11 is Hydrophilite-derived structured and crystallizes in the monoclinic C2 space group. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(3), one O(5), one F(1), one F(4), and one F(6) atom to form FeO3F3 octahedra that share corners with four equivalent Fe(4)O3F3 octahedra, corners with four equivalent Fe(6)O3F3 octahedra,  an edgeedge with one Fe(2)O2F4 octahedra, and  an edgeedge with one Fe(3)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 44-57°. In the second Fe site, Fe(2) is bonded to one O(1), one O(4), one F(1), one F(2), one F(4), and one F(5) atom to form FeO2F4 octahedra that share corners with four equivalent Fe(4)O3F3 octahedra, corners with four equivalent Fe(5)O3F3 octahedra,  an edgeedge with one Fe(2)O2F4 octahedra, and  an edgeedge with one Fe(1)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 42-57°. In the third Fe site, Fe(3) is bonded to two equivalent O(2), two equivalent F(3), and two equivalent F(6) atoms to form a mixture of corner and edge-sharing FeO2F4 octahedra. The corner-sharing octahedral tilt angles range from 38-54°. In the fourth Fe site, Fe(4) is bonded to one O(3), one O(4), one O(5), one F(1), one F(2), and one F(4) atom to form FeO3F3 octahedra that share corners with four equivalent Fe(2)O2F4 octahedra, corners with four equivalent Fe(1)O3F3 octahedra,  an edgeedge with one Fe(5)O3F3 octahedra, and  an edgeedge with one Fe(6)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 42-52°. In the fifth Fe site, Fe(5) is bonded to one O(1), two equivalent O(4), one F(5), and two equivalent F(2) atoms to form FeO3F3 octahedra that share corners with eight equivalent Fe(2)O2F4 octahedra and edges with two equivalent Fe(4)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 43-57°. In the sixth Fe site, Fe(6) is bonded to one O(2), one O(3), one O(5), one F(6), and two equivalent F(3) atoms to form FeO3F3 octahedra that share corners with four equivalent Fe(3)O2F4 octahedra, corners with four equivalent Fe(1)O3F3 octahedra,  an edgeedge with one Fe(4)O3F3 octahedra, and  an edgeedge with one Fe(6)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 38-57°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Fe(5) and two equivalent Fe(2) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to one Fe(1), one Fe(3), and one Fe(6) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(4), and one Fe(6) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Fe(2), one Fe(4), and one Fe(5) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(4), and one Fe(6) atom. There are six inequivalent F sites. In the first F site, F(1) is bonded in a trigonal planar geometry to one Fe(1), one Fe(2), and one Fe(4) atom. In the second F site, F(2) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one Fe(5) atom. In the third F site, F(3) is bonded in a trigonal planar geometry to one Fe(3) and two equivalent Fe(6) atoms. In the fourth F site, F(4) is bonded in a trigonal planar geometry to one Fe(1), one Fe(2), and one Fe(4) atom. In the fifth F site, F(5) is bonded in a distorted T-shaped geometry to one Fe(5) and two equivalent Fe(2) atoms. In the sixth F site, F(6) is bonded in a distorted T-shaped geometry to one Fe(1), one Fe(3), and one Fe(6) atom.
Fe10O9F11 is Hydrophilite-derived structured and crystallizes in the monoclinic C2 space group. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(3), one O(5), one F(1), one F(4), and one F(6) atom to form FeO3F3 octahedra that share corners with four equivalent Fe(4)O3F3 octahedra, corners with four equivalent Fe(6)O3F3 octahedra,  an edgeedge with one Fe(2)O2F4 octahedra, and  an edgeedge with one Fe(3)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 44-57°. The Fe(1)-O(2) bond length is 1.97 Å. The Fe(1)-O(3) bond length is 1.98 Å. The Fe(1)-O(5) bond length is 1.99 Å. The Fe(1)-F(1) bond length is 2.04 Å. The Fe(1)-F(4) bond length is 2.10 Å. The Fe(1)-F(6) bond length is 2.12 Å. In the second Fe site, Fe(2) is bonded to one O(1), one O(4), one F(1), one F(2), one F(4), and one F(5) atom to form FeO2F4 octahedra that share corners with four equivalent Fe(4)O3F3 octahedra, corners with four equivalent Fe(5)O3F3 octahedra,  an edgeedge with one Fe(2)O2F4 octahedra, and  an edgeedge with one Fe(1)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 42-57°. The Fe(2)-O(1) bond length is 1.94 Å. The Fe(2)-O(4) bond length is 1.95 Å. The Fe(2)-F(1) bond length is 2.14 Å. The Fe(2)-F(2) bond length is 2.10 Å. The Fe(2)-F(4) bond length is 2.17 Å. The Fe(2)-F(5) bond length is 2.08 Å. In the third Fe site, Fe(3) is bonded to two equivalent O(2), two equivalent F(3), and two equivalent F(6) atoms to form a mixture of corner and edge-sharing FeO2F4 octahedra. The corner-sharing octahedral tilt angles range from 38-54°. Both Fe(3)-O(2) bond lengths are 1.91 Å. Both Fe(3)-F(3) bond lengths are 2.05 Å. Both Fe(3)-F(6) bond lengths are 2.11 Å. In the fourth Fe site, Fe(4) is bonded to one O(3), one O(4), one O(5), one F(1), one F(2), and one F(4) atom to form FeO3F3 octahedra that share corners with four equivalent Fe(2)O2F4 octahedra, corners with four equivalent Fe(1)O3F3 octahedra,  an edgeedge with one Fe(5)O3F3 octahedra, and  an edgeedge with one Fe(6)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 42-52°. The Fe(4)-O(3) bond length is 2.00 Å. The Fe(4)-O(4) bond length is 1.92 Å. The Fe(4)-O(5) bond length is 1.96 Å. The Fe(4)-F(1) bond length is 2.13 Å. The Fe(4)-F(2) bond length is 2.14 Å. The Fe(4)-F(4) bond length is 2.08 Å. In the fifth Fe site, Fe(5) is bonded to one O(1), two equivalent O(4), one F(5), and two equivalent F(2) atoms to form FeO3F3 octahedra that share corners with eight equivalent Fe(2)O2F4 octahedra and edges with two equivalent Fe(4)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 43-57°. The Fe(5)-O(1) bond length is 1.89 Å. Both Fe(5)-O(4) bond lengths are 1.96 Å. The Fe(5)-F(5) bond length is 2.12 Å. Both Fe(5)-F(2) bond lengths are 2.11 Å. In the sixth Fe site, Fe(6) is bonded to one O(2), one O(3), one O(5), one F(6), and two equivalent F(3) atoms to form FeO3F3 octahedra that share corners with four equivalent Fe(3)O2F4 octahedra, corners with four equivalent Fe(1)O3F3 octahedra,  an edgeedge with one Fe(4)O3F3 octahedra, and  an edgeedge with one Fe(6)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 38-57°. The Fe(6)-O(2) bond length is 1.97 Å. The Fe(6)-O(3) bond length is 1.93 Å. The Fe(6)-O(5) bond length is 1.93 Å. The Fe(6)-F(6) bond length is 2.26 Å. There is one shorter (2.14 Å) and one longer (2.15 Å) Fe(6)-F(3) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Fe(5) and two equivalent Fe(2) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to one Fe(1), one Fe(3), and one Fe(6) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(4), and one Fe(6) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Fe(2), one Fe(4), and one Fe(5) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(4), and one Fe(6) atom. There are six inequivalent F sites. In the first F site, F(1) is bonded in a trigonal planar geometry to one Fe(1), one Fe(2), and one Fe(4) atom. In the second F site, F(2) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one Fe(5) atom. In the third F site, F(3) is bonded in a trigonal planar geometry to one Fe(3) and two equivalent Fe(6) atoms. In the fourth F site, F(4) is bonded in a trigonal planar geometry to one Fe(1), one Fe(2), and one Fe(4) atom. In the fifth F site, F(5) is bonded in a distorted T-shaped geometry to one Fe(5) and two equivalent Fe(2) atoms. In the sixth F site, F(6) is bonded in a distorted T-shaped geometry to one Fe(1), one Fe(3), and one Fe(6) atom.