FeAl2O4 is Spinel-like structured and crystallizes in the triclinic P1 space group. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(17), one O(3), and one O(4) atom to form FeO4 tetrahedra that share  a cornercorner with one Al(10)O6 octahedra,  a cornercorner with one Al(11)O6 octahedra,  a cornercorner with one Al(8)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra, and corners with three equivalent Fe(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-68°. In the second Fe site, Fe(2) is bonded to one O(11), one O(2), one O(6), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra,  a cornercorner with one Al(4)O6 octahedra, corners with two equivalent Al(5)O6 octahedra, corners with two equivalent Al(7)O6 octahedra, corners with two equivalent Al(9)O6 octahedra, and corners with three equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 58-61°. In the third Fe site, Fe(3) is bonded to one O(14), one O(18), one O(19), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Al(5)O6 octahedra,  a cornercorner with one Al(7)O6 octahedra,  a cornercorner with one Al(9)O6 octahedra, corners with two equivalent Al(10)O6 octahedra, corners with two equivalent Al(11)O6 octahedra, corners with two equivalent Al(8)O6 octahedra, and corners with three equivalent Al(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 58-61°. In the fourth Fe site, Fe(4) is bonded to one O(12), one O(16), one O(5), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Al(5)O6 octahedra,  a cornercorner with one Al(7)O6 octahedra,  a cornercorner with one Al(9)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra, and corners with three equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-63°. In the fifth Fe site, Fe(5) is bonded to one O(13), one O(15), one O(20), and one O(23) atom to form FeO4 tetrahedra that share  a cornercorner with one Al(10)O6 octahedra,  a cornercorner with one Al(11)O6 octahedra,  a cornercorner with one Al(8)O6 octahedra, corners with two equivalent Al(5)O6 octahedra, corners with two equivalent Al(7)O6 octahedra, corners with two equivalent Al(9)O6 octahedra, and corners with three equivalent Al(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-63°. In the sixth Fe site, Fe(6) is bonded to one O(1), one O(21), one O(22), one O(24), one O(3), and one O(4) atom to form FeO6 octahedra that share corners with three equivalent Fe(1)O4 tetrahedra, corners with three equivalent Al(12)O4 tetrahedra,  an edgeedge with one Al(1)O6 octahedra,  an edgeedge with one Al(10)O6 octahedra,  an edgeedge with one Al(11)O6 octahedra,  an edgeedge with one Al(3)O6 octahedra,  an edgeedge with one Al(4)O6 octahedra, and  an edgeedge with one Al(8)O6 octahedra. There are twelve inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form AlO6 octahedra that share  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Al(12)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Al(2)O6 octahedra, edges with two equivalent Al(3)O6 octahedra, and edges with two equivalent Al(4)O6 octahedra. In the second Al site, Al(2) is bonded to one O(11), one O(12), one O(5), one O(6), one O(7), and one O(9) atom to form AlO6 octahedra that share corners with three equivalent Fe(2)O4 tetrahedra, corners with three equivalent Fe(4)O4 tetrahedra,  an edgeedge with one Al(1)O6 octahedra,  an edgeedge with one Al(3)O6 octahedra,  an edgeedge with one Al(4)O6 octahedra,  an edgeedge with one Al(5)O6 octahedra,  an edgeedge with one Al(7)O6 octahedra, and  an edgeedge with one Al(9)O6 octahedra. In the third Al site, Al(3) is bonded to one O(1), one O(10), one O(12), one O(2), one O(4), and one O(5) atom to form AlO6 octahedra that share  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Al(12)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Al(2)O6 octahedra, edges with two equivalent Al(1)O6 octahedra, and edges with two equivalent Al(4)O6 octahedra. In the fourth Al site, Al(4) is bonded to one O(1), one O(10), one O(12), one O(2), one O(3), and one O(7) atom to form AlO6 octahedra that share  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Al(12)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Al(2)O6 octahedra, edges with two equivalent Al(1)O6 octahedra, and edges with two equivalent Al(3)O6 octahedra. In the fifth Al site, Al(5) is bonded to one O(11), one O(13), one O(15), one O(16), one O(8), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Fe(4)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra,  an edgeedge with one Al(2)O6 octahedra,  an edgeedge with one Al(6)O6 octahedra, edges with two equivalent Al(7)O6 octahedra, and edges with two equivalent Al(9)O6 octahedra. In the sixth Al site, Al(6) is bonded to one O(13), one O(14), one O(15), one O(18), one O(19), and one O(20) atom to form AlO6 octahedra that share corners with three equivalent Fe(3)O4 tetrahedra, corners with three equivalent Fe(5)O4 tetrahedra,  an edgeedge with one Al(10)O6 octahedra,  an edgeedge with one Al(11)O6 octahedra,  an edgeedge with one Al(5)O6 octahedra,  an edgeedge with one Al(7)O6 octahedra,  an edgeedge with one Al(8)O6 octahedra, and  an edgeedge with one Al(9)O6 octahedra. In the seventh Al site, Al(7) is bonded to one O(11), one O(13), one O(16), one O(20), one O(6), and one O(8) atom to form AlO6 octahedra that share  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Fe(4)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra,  an edgeedge with one Al(2)O6 octahedra,  an edgeedge with one Al(6)O6 octahedra, edges with two equivalent Al(5)O6 octahedra, and edges with two equivalent Al(9)O6 octahedra. In the eighth Al site, Al(8) is bonded to one O(17), one O(18), one O(19), one O(21), one O(22), and one O(23) atom to form AlO6 octahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, corners with two equivalent Al(12)O4 tetrahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Al(6)O6 octahedra, edges with two equivalent Al(10)O6 octahedra, and edges with two equivalent Al(11)O6 octahedra. In the ninth Al site, Al(9) is bonded to one O(15), one O(16), one O(20), one O(6), one O(8), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Fe(4)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra,  an edgeedge with one Al(2)O6 octahedra,  an edgeedge with one Al(6)O6 octahedra, edges with two equivalent Al(5)O6 octahedra, and edges with two equivalent Al(7)O6 octahedra. In the tenth Al site, Al(10) is bonded to one O(14), one O(17), one O(19), one O(21), one O(23), and one O(24) atom to form AlO6 octahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, corners with two equivalent Al(12)O4 tetrahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Al(6)O6 octahedra, edges with two equivalent Al(11)O6 octahedra, and edges with two equivalent Al(8)O6 octahedra. In the eleventh Al site, Al(11) is bonded to one O(14), one O(17), one O(18), one O(22), one O(23), and one O(24) atom to form AlO6 octahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, corners with two equivalent Al(12)O4 tetrahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Al(6)O6 octahedra, edges with two equivalent Al(10)O6 octahedra, and edges with two equivalent Al(8)O6 octahedra. In the twelfth Al site, Al(12) is bonded to one O(10), one O(21), one O(22), and one O(24) atom to form AlO4 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra,  a cornercorner with one Al(4)O6 octahedra, corners with two equivalent Al(10)O6 octahedra, corners with two equivalent Al(11)O6 octahedra, corners with two equivalent Al(8)O6 octahedra, and corners with three equivalent Fe(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-63°. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded to one Fe(1), one Fe(6), one Al(3), and one Al(4) atom to form a mixture of distorted edge and corner-sharing OAl2Fe2 trigonal pyramids. In the second O site, O(2) is bonded to one Fe(2), one Al(1), one Al(3), and one Al(4) atom to form distorted OAl3Fe trigonal pyramids that share  a cornercorner with one O(11)Al3Fe tetrahedra,  a cornercorner with one O(6)Al3Fe tetrahedra,  a cornercorner with one O(9)Al3Fe tetrahedra, corners with two equivalent O(12)Al3Fe tetrahedra, corners with two equivalent O(5)Al3Fe tetrahedra, corners with two equivalent O(7)Al3Fe tetrahedra, and  an edgeedge with one O(1)Al2Fe2 trigonal pyramid. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1), one Fe(6), one Al(1), and one Al(4) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1), one Fe(6), one Al(1), and one Al(3) atom. In the fifth O site, O(5) is bonded to one Fe(4), one Al(1), one Al(2), and one Al(3) atom to form OAl3Fe tetrahedra that share  a cornercorner with one O(11)Al3Fe tetrahedra,  a cornercorner with one O(12)Al3Fe tetrahedra,  a cornercorner with one O(16)Al3Fe tetrahedra,  a cornercorner with one O(6)Al3Fe tetrahedra,  a cornercorner with one O(7)Al3Fe tetrahedra,  a cornercorner with one O(9)Al3Fe tetrahedra,  a cornercorner with one O(1)Al2Fe2 trigonal pyramid, corners with two equivalent O(2)Al3Fe trigonal pyramids,  an edgeedge with one O(12)Al3Fe tetrahedra, and  an edgeedge with one O(7)Al3Fe tetrahedra. In the sixth O site, O(6) is bonded to one Fe(2), one Al(2), one Al(7), and one Al(9) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the seventh O site, O(7) is bonded to one Fe(4), one Al(1), one Al(2), and one Al(4) atom to form OAl3Fe tetrahedra that share  a cornercorner with one O(11)Al3Fe tetrahedra,  a cornercorner with one O(12)Al3Fe tetrahedra,  a cornercorner with one O(16)Al3Fe tetrahedra,  a cornercorner with one O(5)Al3Fe tetrahedra,  a cornercorner with one O(6)Al3Fe tetrahedra,  a cornercorner with one O(9)Al3Fe tetrahedra,  a cornercorner with one O(1)Al2Fe2 trigonal pyramid, corners with two equivalent O(2)Al3Fe trigonal pyramids,  an edgeedge with one O(12)Al3Fe tetrahedra, and  an edgeedge with one O(5)Al3Fe tetrahedra. In the eighth O site, O(8) is bonded to one Fe(3), one Al(5), one Al(7), and one Al(9) atom to form a mixture of distorted edge and corner-sharing OAl3Fe trigonal pyramids. In the ninth O site, O(9) is bonded to one Fe(2), one Al(2), one Al(5), and one Al(9) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the tenth O site, O(10) is bonded in a rectangular see-saw-like geometry to one Al(1), one Al(12), one Al(3), and one Al(4) atom. In the eleventh O site, O(11) is bonded to one Fe(2), one Al(2), one Al(5), and one Al(7) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the twelfth O site, O(12) is bonded to one Fe(4), one Al(2), one Al(3), and one Al(4) atom to form OAl3Fe tetrahedra that share  a cornercorner with one O(11)Al3Fe tetrahedra,  a cornercorner with one O(16)Al3Fe tetrahedra,  a cornercorner with one O(5)Al3Fe tetrahedra,  a cornercorner with one O(6)Al3Fe tetrahedra,  a cornercorner with one O(7)Al3Fe tetrahedra,  a cornercorner with one O(9)Al3Fe tetrahedra, corners with two equivalent O(1)Al2Fe2 trigonal pyramids, corners with two equivalent O(2)Al3Fe trigonal pyramids,  an edgeedge with one O(5)Al3Fe tetrahedra, and  an edgeedge with one O(7)Al3Fe tetrahedra. In the thirteenth O site, O(13) is bonded to one Fe(5), one Al(5), one Al(6), and one Al(7) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the fourteenth O site, O(14) is bonded to one Fe(3), one Al(10), one Al(11), and one Al(6) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the fifteenth O site, O(15) is bonded to one Fe(5), one Al(5), one Al(6), and one Al(9) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the sixteenth O site, O(16) is bonded to one Fe(4), one Al(5), one Al(7), and one Al(9) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the seventeenth O site, O(17) is bonded to one Fe(1), one Al(10), one Al(11), and one Al(8) atom to form distorted OAl3Fe trigonal pyramids that share corners with three equivalent O(23)Al3Fe tetrahedra,  a cornercorner with one O(1)Al2Fe2 trigonal pyramid,  an edgeedge with one O(14)Al3Fe tetrahedra,  an edgeedge with one O(18)Al3Fe tetrahedra, and  an edgeedge with one O(19)Al3Fe tetrahedra. In the eighteenth O site, O(18) is bonded to one Fe(3), one Al(11), one Al(6), and one Al(8) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the nineteenth O site, O(19) is bonded to one Fe(3), one Al(10), one Al(6), and one Al(8) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the twentieth O site, O(20) is bonded to one Fe(5), one Al(6), one Al(7), and one Al(9) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the twenty-first O site, O(21) is bonded in a rectangular see-saw-like geometry to one Fe(6), one Al(10), one Al(12), and one Al(8) atom. In the twenty-second O site, O(22) is bonded in a rectangular see-saw-like geometry to one Fe(6), one Al(11), one Al(12), and one Al(8) atom. In the twenty-third O site, O(23) is bonded to one Fe(5), one Al(10), one Al(11), and one Al(8) atom to form corner-sharing OAl3Fe tetrahedra. In the twenty-fourth O site, O(24) is bonded in a rectangular see-saw-like geometry to one Fe(6), one Al(10), one Al(11), and one Al(12) atom.
FeAl2O4 is Spinel-like structured and crystallizes in the triclinic P1 space group. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(17), one O(3), and one O(4) atom to form FeO4 tetrahedra that share  a cornercorner with one Al(10)O6 octahedra,  a cornercorner with one Al(11)O6 octahedra,  a cornercorner with one Al(8)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra, and corners with three equivalent Fe(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-68°. The Fe(1)-O(1) bond length is 1.96 Å. The Fe(1)-O(17) bond length is 2.03 Å. The Fe(1)-O(3) bond length is 2.00 Å. The Fe(1)-O(4) bond length is 1.99 Å. In the second Fe site, Fe(2) is bonded to one O(11), one O(2), one O(6), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra,  a cornercorner with one Al(4)O6 octahedra, corners with two equivalent Al(5)O6 octahedra, corners with two equivalent Al(7)O6 octahedra, corners with two equivalent Al(9)O6 octahedra, and corners with three equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 58-61°. The Fe(2)-O(11) bond length is 2.00 Å. The Fe(2)-O(2) bond length is 1.99 Å. The Fe(2)-O(6) bond length is 2.00 Å. The Fe(2)-O(9) bond length is 2.00 Å. In the third Fe site, Fe(3) is bonded to one O(14), one O(18), one O(19), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Al(5)O6 octahedra,  a cornercorner with one Al(7)O6 octahedra,  a cornercorner with one Al(9)O6 octahedra, corners with two equivalent Al(10)O6 octahedra, corners with two equivalent Al(11)O6 octahedra, corners with two equivalent Al(8)O6 octahedra, and corners with three equivalent Al(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 58-61°. The Fe(3)-O(14) bond length is 2.01 Å. The Fe(3)-O(18) bond length is 2.01 Å. The Fe(3)-O(19) bond length is 2.01 Å. The Fe(3)-O(8) bond length is 2.00 Å. In the fourth Fe site, Fe(4) is bonded to one O(12), one O(16), one O(5), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Al(5)O6 octahedra,  a cornercorner with one Al(7)O6 octahedra,  a cornercorner with one Al(9)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra, and corners with three equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-63°. The Fe(4)-O(12) bond length is 2.01 Å. The Fe(4)-O(16) bond length is 2.06 Å. The Fe(4)-O(5) bond length is 2.02 Å. The Fe(4)-O(7) bond length is 2.02 Å. In the fifth Fe site, Fe(5) is bonded to one O(13), one O(15), one O(20), and one O(23) atom to form FeO4 tetrahedra that share  a cornercorner with one Al(10)O6 octahedra,  a cornercorner with one Al(11)O6 octahedra,  a cornercorner with one Al(8)O6 octahedra, corners with two equivalent Al(5)O6 octahedra, corners with two equivalent Al(7)O6 octahedra, corners with two equivalent Al(9)O6 octahedra, and corners with three equivalent Al(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-63°. The Fe(5)-O(13) bond length is 2.01 Å. The Fe(5)-O(15) bond length is 2.01 Å. The Fe(5)-O(20) bond length is 2.00 Å. The Fe(5)-O(23) bond length is 2.06 Å. In the sixth Fe site, Fe(6) is bonded to one O(1), one O(21), one O(22), one O(24), one O(3), and one O(4) atom to form FeO6 octahedra that share corners with three equivalent Fe(1)O4 tetrahedra, corners with three equivalent Al(12)O4 tetrahedra,  an edgeedge with one Al(1)O6 octahedra,  an edgeedge with one Al(10)O6 octahedra,  an edgeedge with one Al(11)O6 octahedra,  an edgeedge with one Al(3)O6 octahedra,  an edgeedge with one Al(4)O6 octahedra, and  an edgeedge with one Al(8)O6 octahedra. The Fe(6)-O(1) bond length is 2.11 Å. The Fe(6)-O(21) bond length is 2.17 Å. The Fe(6)-O(22) bond length is 2.16 Å. The Fe(6)-O(24) bond length is 2.18 Å. The Fe(6)-O(3) bond length is 2.07 Å. The Fe(6)-O(4) bond length is 2.08 Å. There are twelve inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form AlO6 octahedra that share  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Al(12)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Al(2)O6 octahedra, edges with two equivalent Al(3)O6 octahedra, and edges with two equivalent Al(4)O6 octahedra. The Al(1)-O(10) bond length is 2.07 Å. The Al(1)-O(2) bond length is 1.93 Å. The Al(1)-O(3) bond length is 1.90 Å. The Al(1)-O(4) bond length is 1.89 Å. The Al(1)-O(5) bond length is 1.93 Å. The Al(1)-O(7) bond length is 1.93 Å. In the second Al site, Al(2) is bonded to one O(11), one O(12), one O(5), one O(6), one O(7), and one O(9) atom to form AlO6 octahedra that share corners with three equivalent Fe(2)O4 tetrahedra, corners with three equivalent Fe(4)O4 tetrahedra,  an edgeedge with one Al(1)O6 octahedra,  an edgeedge with one Al(3)O6 octahedra,  an edgeedge with one Al(4)O6 octahedra,  an edgeedge with one Al(5)O6 octahedra,  an edgeedge with one Al(7)O6 octahedra, and  an edgeedge with one Al(9)O6 octahedra. The Al(2)-O(11) bond length is 1.95 Å. The Al(2)-O(12) bond length is 1.92 Å. The Al(2)-O(5) bond length is 1.92 Å. The Al(2)-O(6) bond length is 1.94 Å. The Al(2)-O(7) bond length is 1.92 Å. The Al(2)-O(9) bond length is 1.94 Å. In the third Al site, Al(3) is bonded to one O(1), one O(10), one O(12), one O(2), one O(4), and one O(5) atom to form AlO6 octahedra that share  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Al(12)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Al(2)O6 octahedra, edges with two equivalent Al(1)O6 octahedra, and edges with two equivalent Al(4)O6 octahedra. The Al(3)-O(1) bond length is 1.89 Å. The Al(3)-O(10) bond length is 2.10 Å. The Al(3)-O(12) bond length is 1.93 Å. The Al(3)-O(2) bond length is 1.93 Å. The Al(3)-O(4) bond length is 1.88 Å. The Al(3)-O(5) bond length is 1.92 Å. In the fourth Al site, Al(4) is bonded to one O(1), one O(10), one O(12), one O(2), one O(3), and one O(7) atom to form AlO6 octahedra that share  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Al(12)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Al(2)O6 octahedra, edges with two equivalent Al(1)O6 octahedra, and edges with two equivalent Al(3)O6 octahedra. The Al(4)-O(1) bond length is 1.88 Å. The Al(4)-O(10) bond length is 2.11 Å. The Al(4)-O(12) bond length is 1.92 Å. The Al(4)-O(2) bond length is 1.94 Å. The Al(4)-O(3) bond length is 1.88 Å. The Al(4)-O(7) bond length is 1.92 Å. In the fifth Al site, Al(5) is bonded to one O(11), one O(13), one O(15), one O(16), one O(8), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Fe(4)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra,  an edgeedge with one Al(2)O6 octahedra,  an edgeedge with one Al(6)O6 octahedra, edges with two equivalent Al(7)O6 octahedra, and edges with two equivalent Al(9)O6 octahedra. The Al(5)-O(11) bond length is 1.93 Å. The Al(5)-O(13) bond length is 1.95 Å. The Al(5)-O(15) bond length is 1.95 Å. The Al(5)-O(16) bond length is 1.94 Å. The Al(5)-O(8) bond length is 1.94 Å. The Al(5)-O(9) bond length is 1.93 Å. In the sixth Al site, Al(6) is bonded to one O(13), one O(14), one O(15), one O(18), one O(19), and one O(20) atom to form AlO6 octahedra that share corners with three equivalent Fe(3)O4 tetrahedra, corners with three equivalent Fe(5)O4 tetrahedra,  an edgeedge with one Al(10)O6 octahedra,  an edgeedge with one Al(11)O6 octahedra,  an edgeedge with one Al(5)O6 octahedra,  an edgeedge with one Al(7)O6 octahedra,  an edgeedge with one Al(8)O6 octahedra, and  an edgeedge with one Al(9)O6 octahedra. The Al(6)-O(13) bond length is 1.93 Å. The Al(6)-O(14) bond length is 1.93 Å. The Al(6)-O(15) bond length is 1.93 Å. The Al(6)-O(18) bond length is 1.94 Å. The Al(6)-O(19) bond length is 1.93 Å. The Al(6)-O(20) bond length is 1.94 Å. In the seventh Al site, Al(7) is bonded to one O(11), one O(13), one O(16), one O(20), one O(6), and one O(8) atom to form AlO6 octahedra that share  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Fe(4)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra,  an edgeedge with one Al(2)O6 octahedra,  an edgeedge with one Al(6)O6 octahedra, edges with two equivalent Al(5)O6 octahedra, and edges with two equivalent Al(9)O6 octahedra. The Al(7)-O(11) bond length is 1.92 Å. The Al(7)-O(13) bond length is 1.95 Å. The Al(7)-O(16) bond length is 1.95 Å. The Al(7)-O(20) bond length is 1.95 Å. The Al(7)-O(6) bond length is 1.92 Å. The Al(7)-O(8) bond length is 1.95 Å. In the eighth Al site, Al(8) is bonded to one O(17), one O(18), one O(19), one O(21), one O(22), and one O(23) atom to form AlO6 octahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, corners with two equivalent Al(12)O4 tetrahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Al(6)O6 octahedra, edges with two equivalent Al(10)O6 octahedra, and edges with two equivalent Al(11)O6 octahedra. The Al(8)-O(17) bond length is 1.93 Å. The Al(8)-O(18) bond length is 1.93 Å. The Al(8)-O(19) bond length is 1.93 Å. The Al(8)-O(21) bond length is 2.00 Å. The Al(8)-O(22) bond length is 2.00 Å. The Al(8)-O(23) bond length is 1.92 Å. In the ninth Al site, Al(9) is bonded to one O(15), one O(16), one O(20), one O(6), one O(8), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Fe(4)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra,  an edgeedge with one Al(2)O6 octahedra,  an edgeedge with one Al(6)O6 octahedra, edges with two equivalent Al(5)O6 octahedra, and edges with two equivalent Al(7)O6 octahedra. The Al(9)-O(15) bond length is 1.96 Å. The Al(9)-O(16) bond length is 1.94 Å. The Al(9)-O(20) bond length is 1.95 Å. The Al(9)-O(6) bond length is 1.92 Å. The Al(9)-O(8) bond length is 1.94 Å. The Al(9)-O(9) bond length is 1.93 Å. In the tenth Al site, Al(10) is bonded to one O(14), one O(17), one O(19), one O(21), one O(23), and one O(24) atom to form AlO6 octahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, corners with two equivalent Al(12)O4 tetrahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Al(6)O6 octahedra, edges with two equivalent Al(11)O6 octahedra, and edges with two equivalent Al(8)O6 octahedra. The Al(10)-O(14) bond length is 1.93 Å. The Al(10)-O(17) bond length is 1.93 Å. The Al(10)-O(19) bond length is 1.93 Å. The Al(10)-O(21) bond length is 1.99 Å. The Al(10)-O(23) bond length is 1.92 Å. The Al(10)-O(24) bond length is 1.99 Å. In the eleventh Al site, Al(11) is bonded to one O(14), one O(17), one O(18), one O(22), one O(23), and one O(24) atom to form AlO6 octahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, corners with two equivalent Al(12)O4 tetrahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Al(6)O6 octahedra, edges with two equivalent Al(10)O6 octahedra, and edges with two equivalent Al(8)O6 octahedra. The Al(11)-O(14) bond length is 1.93 Å. The Al(11)-O(17) bond length is 1.93 Å. The Al(11)-O(18) bond length is 1.93 Å. The Al(11)-O(22) bond length is 2.00 Å. The Al(11)-O(23) bond length is 1.92 Å. The Al(11)-O(24) bond length is 2.00 Å. In the twelfth Al site, Al(12) is bonded to one O(10), one O(21), one O(22), and one O(24) atom to form AlO4 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra,  a cornercorner with one Al(4)O6 octahedra, corners with two equivalent Al(10)O6 octahedra, corners with two equivalent Al(11)O6 octahedra, corners with two equivalent Al(8)O6 octahedra, and corners with three equivalent Fe(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-63°. The Al(12)-O(10) bond length is 1.84 Å. The Al(12)-O(21) bond length is 1.83 Å. The Al(12)-O(22) bond length is 1.83 Å. The Al(12)-O(24) bond length is 1.83 Å. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded to one Fe(1), one Fe(6), one Al(3), and one Al(4) atom to form a mixture of distorted edge and corner-sharing OAl2Fe2 trigonal pyramids. In the second O site, O(2) is bonded to one Fe(2), one Al(1), one Al(3), and one Al(4) atom to form distorted OAl3Fe trigonal pyramids that share  a cornercorner with one O(11)Al3Fe tetrahedra,  a cornercorner with one O(6)Al3Fe tetrahedra,  a cornercorner with one O(9)Al3Fe tetrahedra, corners with two equivalent O(12)Al3Fe tetrahedra, corners with two equivalent O(5)Al3Fe tetrahedra, corners with two equivalent O(7)Al3Fe tetrahedra, and  an edgeedge with one O(1)Al2Fe2 trigonal pyramid. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1), one Fe(6), one Al(1), and one Al(4) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1), one Fe(6), one Al(1), and one Al(3) atom. In the fifth O site, O(5) is bonded to one Fe(4), one Al(1), one Al(2), and one Al(3) atom to form OAl3Fe tetrahedra that share  a cornercorner with one O(11)Al3Fe tetrahedra,  a cornercorner with one O(12)Al3Fe tetrahedra,  a cornercorner with one O(16)Al3Fe tetrahedra,  a cornercorner with one O(6)Al3Fe tetrahedra,  a cornercorner with one O(7)Al3Fe tetrahedra,  a cornercorner with one O(9)Al3Fe tetrahedra,  a cornercorner with one O(1)Al2Fe2 trigonal pyramid, corners with two equivalent O(2)Al3Fe trigonal pyramids,  an edgeedge with one O(12)Al3Fe tetrahedra, and  an edgeedge with one O(7)Al3Fe tetrahedra. In the sixth O site, O(6) is bonded to one Fe(2), one Al(2), one Al(7), and one Al(9) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the seventh O site, O(7) is bonded to one Fe(4), one Al(1), one Al(2), and one Al(4) atom to form OAl3Fe tetrahedra that share  a cornercorner with one O(11)Al3Fe tetrahedra,  a cornercorner with one O(12)Al3Fe tetrahedra,  a cornercorner with one O(16)Al3Fe tetrahedra,  a cornercorner with one O(5)Al3Fe tetrahedra,  a cornercorner with one O(6)Al3Fe tetrahedra,  a cornercorner with one O(9)Al3Fe tetrahedra,  a cornercorner with one O(1)Al2Fe2 trigonal pyramid, corners with two equivalent O(2)Al3Fe trigonal pyramids,  an edgeedge with one O(12)Al3Fe tetrahedra, and  an edgeedge with one O(5)Al3Fe tetrahedra. In the eighth O site, O(8) is bonded to one Fe(3), one Al(5), one Al(7), and one Al(9) atom to form a mixture of distorted edge and corner-sharing OAl3Fe trigonal pyramids. In the ninth O site, O(9) is bonded to one Fe(2), one Al(2), one Al(5), and one Al(9) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the tenth O site, O(10) is bonded in a rectangular see-saw-like geometry to one Al(1), one Al(12), one Al(3), and one Al(4) atom. In the eleventh O site, O(11) is bonded to one Fe(2), one Al(2), one Al(5), and one Al(7) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the twelfth O site, O(12) is bonded to one Fe(4), one Al(2), one Al(3), and one Al(4) atom to form OAl3Fe tetrahedra that share  a cornercorner with one O(11)Al3Fe tetrahedra,  a cornercorner with one O(16)Al3Fe tetrahedra,  a cornercorner with one O(5)Al3Fe tetrahedra,  a cornercorner with one O(6)Al3Fe tetrahedra,  a cornercorner with one O(7)Al3Fe tetrahedra,  a cornercorner with one O(9)Al3Fe tetrahedra, corners with two equivalent O(1)Al2Fe2 trigonal pyramids, corners with two equivalent O(2)Al3Fe trigonal pyramids,  an edgeedge with one O(5)Al3Fe tetrahedra, and  an edgeedge with one O(7)Al3Fe tetrahedra. In the thirteenth O site, O(13) is bonded to one Fe(5), one Al(5), one Al(6), and one Al(7) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the fourteenth O site, O(14) is bonded to one Fe(3), one Al(10), one Al(11), and one Al(6) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the fifteenth O site, O(15) is bonded to one Fe(5), one Al(5), one Al(6), and one Al(9) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the sixteenth O site, O(16) is bonded to one Fe(4), one Al(5), one Al(7), and one Al(9) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the seventeenth O site, O(17) is bonded to one Fe(1), one Al(10), one Al(11), and one Al(8) atom to form distorted OAl3Fe trigonal pyramids that share corners with three equivalent O(23)Al3Fe tetrahedra,  a cornercorner with one O(1)Al2Fe2 trigonal pyramid,  an edgeedge with one O(14)Al3Fe tetrahedra,  an edgeedge with one O(18)Al3Fe tetrahedra, and  an edgeedge with one O(19)Al3Fe tetrahedra. In the eighteenth O site, O(18) is bonded to one Fe(3), one Al(11), one Al(6), and one Al(8) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the nineteenth O site, O(19) is bonded to one Fe(3), one Al(10), one Al(6), and one Al(8) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the twentieth O site, O(20) is bonded to one Fe(5), one Al(6), one Al(7), and one Al(9) atom to form a mixture of distorted edge and corner-sharing OAl3Fe tetrahedra. In the twenty-first O site, O(21) is bonded in a rectangular see-saw-like geometry to one Fe(6), one Al(10), one Al(12), and one Al(8) atom. In the twenty-second O site, O(22) is bonded in a rectangular see-saw-like geometry to one Fe(6), one Al(11), one Al(12), and one Al(8) atom. In the twenty-third O site, O(23) is bonded to one Fe(5), one Al(10), one Al(11), and one Al(8) atom to form corner-sharing OAl3Fe tetrahedra. In the twenty-fourth O site, O(24) is bonded in a rectangular see-saw-like geometry to one Fe(6), one Al(10), one Al(11), and one Al(12) atom.