Ca8Al3(FeO4)5 crystallizes in the triclinic P1 space group. There are eight inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(13), one O(16), one O(17), one O(2), one O(7), and one O(9) atom. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(14), one O(15), one O(18), one O(2), and one O(8) atom. In the third Ca site, Ca(3) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(16), one O(19), one O(3), one O(4), one O(5), and one O(9) atom. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(14), one O(15), one O(20), one O(3), one O(4), and one O(6) atom. In the fifth Ca site, Ca(5) is bonded in a 8-coordinate geometry to one O(12), one O(14), one O(15), one O(17), one O(3), one O(5), one O(6), and one O(9) atom. In the sixth Ca site, Ca(6) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(16), one O(18), one O(4), one O(5), and one O(6) atom. In the seventh Ca site, Ca(7) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(13), one O(16), one O(19), one O(7), and one O(8) atom. In the eighth Ca site, Ca(8) is bonded in a 8-coordinate geometry to one O(12), one O(14), one O(15), one O(2), one O(20), one O(7), one O(8), and one O(9) atom. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(11), one O(14), one O(15), one O(6), and one O(8) atom to form FeO6 octahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra, and  a cornercorner with one Fe(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 11-12°. In the second Fe site, Fe(2) is bonded to one O(18), one O(2), one O(20), and one O(6) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra,  a cornercorner with one Fe(4)O4 tetrahedra, and  a cornercorner with one Fe(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-38°. In the third Fe site, Fe(3) is bonded to one O(1), one O(17), one O(19), and one O(5) 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 Fe(4)O4 tetrahedra, and  a cornercorner with one Fe(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-34°. In the fourth Fe site, Fe(4) is bonded to one O(18), one O(19), one O(4), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra, and  a cornercorner with one Fe(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-38°. In the fifth Fe site, Fe(5) is bonded to one O(17), one O(20), one O(3), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Al(2)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra, and  a cornercorner with one Fe(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-34°. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(10), one O(11), one O(13), one O(16), and one O(4) atom to form AlO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Al(3)O6 octahedra,  a cornercorner with one Fe(3)O4 tetrahedra, and  a cornercorner with one Fe(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 10-12°. In the second Al site, Al(2) is bonded to one O(12), one O(14), one O(15), one O(2), one O(3), and one O(9) atom to form AlO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Al(3)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra, and  a cornercorner with one Fe(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 10-12°. In the third Al site, Al(3) is bonded to one O(12), one O(13), one O(16), one O(5), one O(7), and one O(9) atom to form AlO6 octahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O6 octahedra,  a cornercorner with one Fe(3)O4 tetrahedra, and  a cornercorner with one Fe(5)O4 tetrahedra. The corner-sharing octahedral tilt angles are 10°. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(2), one Ca(7), one Fe(3), and one Al(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(2), one Ca(8), one Fe(2), and one Al(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Ca(3), one Ca(4), one Ca(5), one Fe(5), and one Al(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Ca(3), one Ca(4), one Ca(6), one Fe(4), and one Al(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Ca(3), one Ca(5), one Ca(6), one Fe(3), and one Al(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(5), one Ca(6), one Fe(1), and one Fe(2) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(7), one Ca(8), one Fe(5), and one Al(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(7), one Ca(8), one Fe(1), and one Fe(4) atom. In the ninth O site, O(9) is bonded to one Ca(1), one Ca(3), one Ca(5), one Ca(8), one Al(2), and one Al(3) atom to form distorted OCa4Al2 octahedra that share  a cornercorner with one O(13)Ca4Al2 octahedra,  a cornercorner with one O(14)Ca4AlFe octahedra,  a cornercorner with one O(19)Ca2Fe2 tetrahedra,  a cornercorner with one O(20)Ca2Fe2 tetrahedra, corners with two equivalent O(17)Ca2Fe2 tetrahedra,  an edgeedge with one O(13)Ca4Al2 octahedra,  an edgeedge with one O(14)Ca4AlFe octahedra,  a faceface with one O(16)Ca4Al2 octahedra,  a faceface with one O(15)Ca4AlFe octahedra, and faces with two equivalent O(12)Ca4Al2 octahedra. The corner-sharing octahedral tilt angles range from 1-2°. In the tenth O site, O(10) is bonded to one Ca(2), one Ca(4), one Ca(6), one Ca(7), one Fe(1), and one Al(1) atom to form distorted OCa4AlFe octahedra that share  a cornercorner with one O(13)Ca4Al2 octahedra,  a cornercorner with one O(14)Ca4AlFe octahedra,  a cornercorner with one O(19)Ca2Fe2 tetrahedra,  a cornercorner with one O(20)Ca2Fe2 tetrahedra, corners with two equivalent O(18)Ca2Fe2 tetrahedra,  an edgeedge with one O(13)Ca4Al2 octahedra,  an edgeedge with one O(14)Ca4AlFe octahedra,  a faceface with one O(16)Ca4Al2 octahedra,  a faceface with one O(15)Ca4AlFe octahedra, and faces with two equivalent O(11)Ca4AlFe octahedra. The corner-sharing octahedral tilt angles are 1°. In the eleventh O site, O(11) is bonded to one Ca(2), one Ca(4), one Ca(6), one Ca(7), one Fe(1), and one Al(1) atom to form distorted OCa4AlFe octahedra that share  a cornercorner with one O(16)Ca4Al2 octahedra,  a cornercorner with one O(15)Ca4AlFe octahedra,  a cornercorner with one O(19)Ca2Fe2 tetrahedra,  a cornercorner with one O(20)Ca2Fe2 tetrahedra, corners with two equivalent O(18)Ca2Fe2 tetrahedra,  an edgeedge with one O(16)Ca4Al2 octahedra,  an edgeedge with one O(15)Ca4AlFe octahedra,  a faceface with one O(13)Ca4Al2 octahedra,  a faceface with one O(14)Ca4AlFe octahedra, and faces with two equivalent O(10)Ca4AlFe octahedra. The corner-sharing octahedral tilt angles are 1°. In the twelfth O site, O(12) is bonded to one Ca(1), one Ca(3), one Ca(5), one Ca(8), one Al(2), and one Al(3) atom to form distorted OCa4Al2 octahedra that share  a cornercorner with one O(16)Ca4Al2 octahedra,  a cornercorner with one O(15)Ca4AlFe octahedra,  a cornercorner with one O(19)Ca2Fe2 tetrahedra,  a cornercorner with one O(20)Ca2Fe2 tetrahedra, corners with two equivalent O(17)Ca2Fe2 tetrahedra,  an edgeedge with one O(16)Ca4Al2 octahedra,  an edgeedge with one O(15)Ca4AlFe octahedra,  a faceface with one O(13)Ca4Al2 octahedra,  a faceface with one O(14)Ca4AlFe octahedra, and faces with two equivalent O(9)Ca4Al2 octahedra. The corner-sharing octahedral tilt angles range from 1-3°. In the thirteenth O site, O(13) is bonded to one Ca(1), one Ca(3), one Ca(6), one Ca(7), one Al(1), and one Al(3) atom to form distorted OCa4Al2 octahedra that share  a cornercorner with one O(9)Ca4Al2 octahedra,  a cornercorner with one O(10)Ca4AlFe octahedra,  a cornercorner with one O(17)Ca2Fe2 tetrahedra,  a cornercorner with one O(18)Ca2Fe2 tetrahedra, corners with two equivalent O(19)Ca2Fe2 tetrahedra,  an edgeedge with one O(9)Ca4Al2 octahedra,  an edgeedge with one O(10)Ca4AlFe octahedra,  a faceface with one O(12)Ca4Al2 octahedra,  a faceface with one O(11)Ca4AlFe octahedra, and faces with two equivalent O(16)Ca4Al2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the fourteenth O site, O(14) is bonded to one Ca(2), one Ca(4), one Ca(5), one Ca(8), one Fe(1), and one Al(2) atom to form distorted OCa4AlFe octahedra that share  a cornercorner with one O(9)Ca4Al2 octahedra,  a cornercorner with one O(10)Ca4AlFe octahedra,  a cornercorner with one O(17)Ca2Fe2 tetrahedra,  a cornercorner with one O(18)Ca2Fe2 tetrahedra, corners with two equivalent O(20)Ca2Fe2 tetrahedra,  an edgeedge with one O(9)Ca4Al2 octahedra,  an edgeedge with one O(10)Ca4AlFe octahedra,  a faceface with one O(12)Ca4Al2 octahedra,  a faceface with one O(11)Ca4AlFe octahedra, and faces with two equivalent O(15)Ca4AlFe octahedra. The corner-sharing octahedral tilt angles range from 1-2°. In the fifteenth O site, O(15) is bonded to one Ca(2), one Ca(4), one Ca(5), one Ca(8), one Fe(1), and one Al(2) atom to form distorted OCa4AlFe octahedra that share  a cornercorner with one O(12)Ca4Al2 octahedra,  a cornercorner with one O(11)Ca4AlFe octahedra,  a cornercorner with one O(17)Ca2Fe2 tetrahedra,  a cornercorner with one O(18)Ca2Fe2 tetrahedra, corners with two equivalent O(20)Ca2Fe2 tetrahedra,  an edgeedge with one O(12)Ca4Al2 octahedra,  an edgeedge with one O(11)Ca4AlFe octahedra,  a faceface with one O(9)Ca4Al2 octahedra,  a faceface with one O(10)Ca4AlFe octahedra, and faces with two equivalent O(14)Ca4AlFe octahedra. The corner-sharing octahedral tilt angles range from 1-3°. In the sixteenth O site, O(16) is bonded to one Ca(1), one Ca(3), one Ca(6), one Ca(7), one Al(1), and one Al(3) atom to form distorted OCa4Al2 octahedra that share  a cornercorner with one O(12)Ca4Al2 octahedra,  a cornercorner with one O(11)Ca4AlFe octahedra,  a cornercorner with one O(17)Ca2Fe2 tetrahedra,  a cornercorner with one O(18)Ca2Fe2 tetrahedra, corners with two equivalent O(19)Ca2Fe2 tetrahedra,  an edgeedge with one O(12)Ca4Al2 octahedra,  an edgeedge with one O(11)Ca4AlFe octahedra,  a faceface with one O(9)Ca4Al2 octahedra,  a faceface with one O(10)Ca4AlFe octahedra, and faces with two equivalent O(13)Ca4Al2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the seventeenth O site, O(17) is bonded to one Ca(1), one Ca(5), one Fe(3), and one Fe(5) atom to form distorted OCa2Fe2 tetrahedra that share  a cornercorner with one O(13)Ca4Al2 octahedra,  a cornercorner with one O(16)Ca4Al2 octahedra,  a cornercorner with one O(14)Ca4AlFe octahedra,  a cornercorner with one O(15)Ca4AlFe octahedra, corners with two equivalent O(12)Ca4Al2 octahedra, corners with two equivalent O(9)Ca4Al2 octahedra,  a cornercorner with one O(19)Ca2Fe2 tetrahedra, and  a cornercorner with one O(20)Ca2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 24-77°. In the eighteenth O site, O(18) is bonded to one Ca(2), one Ca(6), one Fe(2), and one Fe(4) atom to form distorted OCa2Fe2 tetrahedra that share  a cornercorner with one O(13)Ca4Al2 octahedra,  a cornercorner with one O(16)Ca4Al2 octahedra,  a cornercorner with one O(14)Ca4AlFe octahedra,  a cornercorner with one O(15)Ca4AlFe octahedra, corners with two equivalent O(10)Ca4AlFe octahedra, corners with two equivalent O(11)Ca4AlFe octahedra,  a cornercorner with one O(19)Ca2Fe2 tetrahedra, and  a cornercorner with one O(20)Ca2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 23-79°. In the nineteenth O site, O(19) is bonded to one Ca(3), one Ca(7), one Fe(3), and one Fe(4) atom to form distorted OCa2Fe2 tetrahedra that share  a cornercorner with one O(12)Ca4Al2 octahedra,  a cornercorner with one O(9)Ca4Al2 octahedra,  a cornercorner with one O(10)Ca4AlFe octahedra,  a cornercorner with one O(11)Ca4AlFe octahedra, corners with two equivalent O(13)Ca4Al2 octahedra, corners with two equivalent O(16)Ca4Al2 octahedra,  a cornercorner with one O(17)Ca2Fe2 tetrahedra, and  a cornercorner with one O(18)Ca2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 23-79°. In the twentieth O site, O(20) is bonded to one Ca(4), one Ca(8), one Fe(2), and one Fe(5) atom to form distorted OCa2Fe2 tetrahedra that share  a cornercorner with one O(12)Ca4Al2 octahedra,  a cornercorner with one O(9)Ca4Al2 octahedra,  a cornercorner with one O(10)Ca4AlFe octahedra,  a cornercorner with one O(11)Ca4AlFe octahedra, corners with two equivalent O(14)Ca4AlFe octahedra, corners with two equivalent O(15)Ca4AlFe octahedra,  a cornercorner with one O(17)Ca2Fe2 tetrahedra, and  a cornercorner with one O(18)Ca2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 23-78°.
Ca8Al3(FeO4)5 crystallizes in the triclinic P1 space group. There are eight inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(13), one O(16), one O(17), one O(2), one O(7), and one O(9) atom. The Ca(1)-O(1) bond length is 2.85 Å. The Ca(1)-O(12) bond length is 2.45 Å. The Ca(1)-O(13) bond length is 2.46 Å. The Ca(1)-O(16) bond length is 2.54 Å. The Ca(1)-O(17) bond length is 2.34 Å. The Ca(1)-O(2) bond length is 2.54 Å. The Ca(1)-O(7) bond length is 2.36 Å. The Ca(1)-O(9) bond length is 2.52 Å. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(14), one O(15), one O(18), one O(2), and one O(8) atom. The Ca(2)-O(1) bond length is 2.59 Å. The Ca(2)-O(10) bond length is 2.54 Å. The Ca(2)-O(11) bond length is 2.42 Å. The Ca(2)-O(14) bond length is 2.45 Å. The Ca(2)-O(15) bond length is 2.59 Å. The Ca(2)-O(18) bond length is 2.34 Å. The Ca(2)-O(2) bond length is 2.92 Å. The Ca(2)-O(8) bond length is 2.32 Å. In the third Ca site, Ca(3) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(16), one O(19), one O(3), one O(4), one O(5), and one O(9) atom. The Ca(3)-O(12) bond length is 2.51 Å. The Ca(3)-O(13) bond length is 2.55 Å. The Ca(3)-O(16) bond length is 2.47 Å. The Ca(3)-O(19) bond length is 2.35 Å. The Ca(3)-O(3) bond length is 2.53 Å. The Ca(3)-O(4) bond length is 2.84 Å. The Ca(3)-O(5) bond length is 2.36 Å. The Ca(3)-O(9) bond length is 2.43 Å. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(14), one O(15), one O(20), one O(3), one O(4), and one O(6) atom. The Ca(4)-O(10) bond length is 2.43 Å. The Ca(4)-O(11) bond length is 2.56 Å. The Ca(4)-O(14) bond length is 2.58 Å. The Ca(4)-O(15) bond length is 2.44 Å. The Ca(4)-O(20) bond length is 2.34 Å. The Ca(4)-O(3) bond length is 2.91 Å. The Ca(4)-O(4) bond length is 2.60 Å. The Ca(4)-O(6) bond length is 2.32 Å. In the fifth Ca site, Ca(5) is bonded in a 8-coordinate geometry to one O(12), one O(14), one O(15), one O(17), one O(3), one O(5), one O(6), and one O(9) atom. The Ca(5)-O(12) bond length is 2.55 Å. The Ca(5)-O(14) bond length is 2.55 Å. The Ca(5)-O(15) bond length is 2.44 Å. The Ca(5)-O(17) bond length is 2.33 Å. The Ca(5)-O(3) bond length is 2.35 Å. The Ca(5)-O(5) bond length is 2.87 Å. The Ca(5)-O(6) bond length is 2.56 Å. The Ca(5)-O(9) bond length is 2.47 Å. In the sixth Ca site, Ca(6) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(16), one O(18), one O(4), one O(5), and one O(6) atom. The Ca(6)-O(10) bond length is 2.47 Å. The Ca(6)-O(11) bond length is 2.58 Å. The Ca(6)-O(13) bond length is 2.52 Å. The Ca(6)-O(16) bond length is 2.43 Å. The Ca(6)-O(18) bond length is 2.35 Å. The Ca(6)-O(4) bond length is 2.34 Å. The Ca(6)-O(5) bond length is 2.54 Å. The Ca(6)-O(6) bond length is 2.97 Å. In the seventh Ca site, Ca(7) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(13), one O(16), one O(19), one O(7), and one O(8) atom. The Ca(7)-O(1) bond length is 2.34 Å. The Ca(7)-O(10) bond length is 2.58 Å. The Ca(7)-O(11) bond length is 2.46 Å. The Ca(7)-O(13) bond length is 2.43 Å. The Ca(7)-O(16) bond length is 2.52 Å. The Ca(7)-O(19) bond length is 2.34 Å. The Ca(7)-O(7) bond length is 2.54 Å. The Ca(7)-O(8) bond length is 2.98 Å. In the eighth Ca site, Ca(8) is bonded in a 8-coordinate geometry to one O(12), one O(14), one O(15), one O(2), one O(20), one O(7), one O(8), and one O(9) atom. The Ca(8)-O(12) bond length is 2.47 Å. The Ca(8)-O(14) bond length is 2.44 Å. The Ca(8)-O(15) bond length is 2.55 Å. The Ca(8)-O(2) bond length is 2.35 Å. The Ca(8)-O(20) bond length is 2.34 Å. The Ca(8)-O(7) bond length is 2.86 Å. The Ca(8)-O(8) bond length is 2.56 Å. The Ca(8)-O(9) bond length is 2.55 Å. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(11), one O(14), one O(15), one O(6), and one O(8) atom to form FeO6 octahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra, and  a cornercorner with one Fe(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 11-12°. The Fe(1)-O(10) bond length is 1.98 Å. The Fe(1)-O(11) bond length is 1.99 Å. The Fe(1)-O(14) bond length is 2.00 Å. The Fe(1)-O(15) bond length is 2.00 Å. The Fe(1)-O(6) bond length is 2.15 Å. The Fe(1)-O(8) bond length is 2.15 Å. In the second Fe site, Fe(2) is bonded to one O(18), one O(2), one O(20), and one O(6) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra,  a cornercorner with one Fe(4)O4 tetrahedra, and  a cornercorner with one Fe(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-38°. The Fe(2)-O(18) bond length is 1.96 Å. The Fe(2)-O(2) bond length is 1.88 Å. The Fe(2)-O(20) bond length is 1.94 Å. The Fe(2)-O(6) bond length is 1.87 Å. In the third Fe site, Fe(3) is bonded to one O(1), one O(17), one O(19), and one O(5) 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 Fe(4)O4 tetrahedra, and  a cornercorner with one Fe(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-34°. The Fe(3)-O(1) bond length is 1.88 Å. The Fe(3)-O(17) bond length is 1.96 Å. The Fe(3)-O(19) bond length is 1.94 Å. The Fe(3)-O(5) bond length is 1.88 Å. In the fourth Fe site, Fe(4) is bonded to one O(18), one O(19), one O(4), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra, and  a cornercorner with one Fe(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-38°. The Fe(4)-O(18) bond length is 1.94 Å. The Fe(4)-O(19) bond length is 1.96 Å. The Fe(4)-O(4) bond length is 1.88 Å. The Fe(4)-O(8) bond length is 1.86 Å. In the fifth Fe site, Fe(5) is bonded to one O(17), one O(20), one O(3), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Al(2)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra, and  a cornercorner with one Fe(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-34°. The Fe(5)-O(17) bond length is 1.94 Å. The Fe(5)-O(20) bond length is 1.96 Å. The Fe(5)-O(3) bond length is 1.88 Å. The Fe(5)-O(7) bond length is 1.88 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(10), one O(11), one O(13), one O(16), and one O(4) atom to form AlO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Al(3)O6 octahedra,  a cornercorner with one Fe(3)O4 tetrahedra, and  a cornercorner with one Fe(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 10-12°. The Al(1)-O(1) bond length is 2.06 Å. The Al(1)-O(10) bond length is 1.90 Å. The Al(1)-O(11) bond length is 1.90 Å. The Al(1)-O(13) bond length is 1.91 Å. The Al(1)-O(16) bond length is 1.91 Å. The Al(1)-O(4) bond length is 2.03 Å. In the second Al site, Al(2) is bonded to one O(12), one O(14), one O(15), one O(2), one O(3), and one O(9) atom to form AlO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Al(3)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra, and  a cornercorner with one Fe(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 10-12°. The Al(2)-O(12) bond length is 1.92 Å. The Al(2)-O(14) bond length is 1.88 Å. The Al(2)-O(15) bond length is 1.88 Å. The Al(2)-O(2) bond length is 2.03 Å. The Al(2)-O(3) bond length is 2.07 Å. The Al(2)-O(9) bond length is 1.92 Å. In the third Al site, Al(3) is bonded to one O(12), one O(13), one O(16), one O(5), one O(7), and one O(9) atom to form AlO6 octahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O6 octahedra,  a cornercorner with one Fe(3)O4 tetrahedra, and  a cornercorner with one Fe(5)O4 tetrahedra. The corner-sharing octahedral tilt angles are 10°. The Al(3)-O(12) bond length is 1.90 Å. The Al(3)-O(13) bond length is 1.93 Å. The Al(3)-O(16) bond length is 1.93 Å. The Al(3)-O(5) bond length is 2.05 Å. The Al(3)-O(7) bond length is 2.05 Å. The Al(3)-O(9) bond length is 1.90 Å. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(2), one Ca(7), one Fe(3), and one Al(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(2), one Ca(8), one Fe(2), and one Al(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Ca(3), one Ca(4), one Ca(5), one Fe(5), and one Al(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Ca(3), one Ca(4), one Ca(6), one Fe(4), and one Al(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Ca(3), one Ca(5), one Ca(6), one Fe(3), and one Al(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(5), one Ca(6), one Fe(1), and one Fe(2) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(7), one Ca(8), one Fe(5), and one Al(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(7), one Ca(8), one Fe(1), and one Fe(4) atom. In the ninth O site, O(9) is bonded to one Ca(1), one Ca(3), one Ca(5), one Ca(8), one Al(2), and one Al(3) atom to form distorted OCa4Al2 octahedra that share  a cornercorner with one O(13)Ca4Al2 octahedra,  a cornercorner with one O(14)Ca4AlFe octahedra,  a cornercorner with one O(19)Ca2Fe2 tetrahedra,  a cornercorner with one O(20)Ca2Fe2 tetrahedra, corners with two equivalent O(17)Ca2Fe2 tetrahedra,  an edgeedge with one O(13)Ca4Al2 octahedra,  an edgeedge with one O(14)Ca4AlFe octahedra,  a faceface with one O(16)Ca4Al2 octahedra,  a faceface with one O(15)Ca4AlFe octahedra, and faces with two equivalent O(12)Ca4Al2 octahedra. The corner-sharing octahedral tilt angles range from 1-2°. In the tenth O site, O(10) is bonded to one Ca(2), one Ca(4), one Ca(6), one Ca(7), one Fe(1), and one Al(1) atom to form distorted OCa4AlFe octahedra that share  a cornercorner with one O(13)Ca4Al2 octahedra,  a cornercorner with one O(14)Ca4AlFe octahedra,  a cornercorner with one O(19)Ca2Fe2 tetrahedra,  a cornercorner with one O(20)Ca2Fe2 tetrahedra, corners with two equivalent O(18)Ca2Fe2 tetrahedra,  an edgeedge with one O(13)Ca4Al2 octahedra,  an edgeedge with one O(14)Ca4AlFe octahedra,  a faceface with one O(16)Ca4Al2 octahedra,  a faceface with one O(15)Ca4AlFe octahedra, and faces with two equivalent O(11)Ca4AlFe octahedra. The corner-sharing octahedral tilt angles are 1°. In the eleventh O site, O(11) is bonded to one Ca(2), one Ca(4), one Ca(6), one Ca(7), one Fe(1), and one Al(1) atom to form distorted OCa4AlFe octahedra that share  a cornercorner with one O(16)Ca4Al2 octahedra,  a cornercorner with one O(15)Ca4AlFe octahedra,  a cornercorner with one O(19)Ca2Fe2 tetrahedra,  a cornercorner with one O(20)Ca2Fe2 tetrahedra, corners with two equivalent O(18)Ca2Fe2 tetrahedra,  an edgeedge with one O(16)Ca4Al2 octahedra,  an edgeedge with one O(15)Ca4AlFe octahedra,  a faceface with one O(13)Ca4Al2 octahedra,  a faceface with one O(14)Ca4AlFe octahedra, and faces with two equivalent O(10)Ca4AlFe octahedra. The corner-sharing octahedral tilt angles are 1°. In the twelfth O site, O(12) is bonded to one Ca(1), one Ca(3), one Ca(5), one Ca(8), one Al(2), and one Al(3) atom to form distorted OCa4Al2 octahedra that share  a cornercorner with one O(16)Ca4Al2 octahedra,  a cornercorner with one O(15)Ca4AlFe octahedra,  a cornercorner with one O(19)Ca2Fe2 tetrahedra,  a cornercorner with one O(20)Ca2Fe2 tetrahedra, corners with two equivalent O(17)Ca2Fe2 tetrahedra,  an edgeedge with one O(16)Ca4Al2 octahedra,  an edgeedge with one O(15)Ca4AlFe octahedra,  a faceface with one O(13)Ca4Al2 octahedra,  a faceface with one O(14)Ca4AlFe octahedra, and faces with two equivalent O(9)Ca4Al2 octahedra. The corner-sharing octahedral tilt angles range from 1-3°. In the thirteenth O site, O(13) is bonded to one Ca(1), one Ca(3), one Ca(6), one Ca(7), one Al(1), and one Al(3) atom to form distorted OCa4Al2 octahedra that share  a cornercorner with one O(9)Ca4Al2 octahedra,  a cornercorner with one O(10)Ca4AlFe octahedra,  a cornercorner with one O(17)Ca2Fe2 tetrahedra,  a cornercorner with one O(18)Ca2Fe2 tetrahedra, corners with two equivalent O(19)Ca2Fe2 tetrahedra,  an edgeedge with one O(9)Ca4Al2 octahedra,  an edgeedge with one O(10)Ca4AlFe octahedra,  a faceface with one O(12)Ca4Al2 octahedra,  a faceface with one O(11)Ca4AlFe octahedra, and faces with two equivalent O(16)Ca4Al2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the fourteenth O site, O(14) is bonded to one Ca(2), one Ca(4), one Ca(5), one Ca(8), one Fe(1), and one Al(2) atom to form distorted OCa4AlFe octahedra that share  a cornercorner with one O(9)Ca4Al2 octahedra,  a cornercorner with one O(10)Ca4AlFe octahedra,  a cornercorner with one O(17)Ca2Fe2 tetrahedra,  a cornercorner with one O(18)Ca2Fe2 tetrahedra, corners with two equivalent O(20)Ca2Fe2 tetrahedra,  an edgeedge with one O(9)Ca4Al2 octahedra,  an edgeedge with one O(10)Ca4AlFe octahedra,  a faceface with one O(12)Ca4Al2 octahedra,  a faceface with one O(11)Ca4AlFe octahedra, and faces with two equivalent O(15)Ca4AlFe octahedra. The corner-sharing octahedral tilt angles range from 1-2°. In the fifteenth O site, O(15) is bonded to one Ca(2), one Ca(4), one Ca(5), one Ca(8), one Fe(1), and one Al(2) atom to form distorted OCa4AlFe octahedra that share  a cornercorner with one O(12)Ca4Al2 octahedra,  a cornercorner with one O(11)Ca4AlFe octahedra,  a cornercorner with one O(17)Ca2Fe2 tetrahedra,  a cornercorner with one O(18)Ca2Fe2 tetrahedra, corners with two equivalent O(20)Ca2Fe2 tetrahedra,  an edgeedge with one O(12)Ca4Al2 octahedra,  an edgeedge with one O(11)Ca4AlFe octahedra,  a faceface with one O(9)Ca4Al2 octahedra,  a faceface with one O(10)Ca4AlFe octahedra, and faces with two equivalent O(14)Ca4AlFe octahedra. The corner-sharing octahedral tilt angles range from 1-3°. In the sixteenth O site, O(16) is bonded to one Ca(1), one Ca(3), one Ca(6), one Ca(7), one Al(1), and one Al(3) atom to form distorted OCa4Al2 octahedra that share  a cornercorner with one O(12)Ca4Al2 octahedra,  a cornercorner with one O(11)Ca4AlFe octahedra,  a cornercorner with one O(17)Ca2Fe2 tetrahedra,  a cornercorner with one O(18)Ca2Fe2 tetrahedra, corners with two equivalent O(19)Ca2Fe2 tetrahedra,  an edgeedge with one O(12)Ca4Al2 octahedra,  an edgeedge with one O(11)Ca4AlFe octahedra,  a faceface with one O(9)Ca4Al2 octahedra,  a faceface with one O(10)Ca4AlFe octahedra, and faces with two equivalent O(13)Ca4Al2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the seventeenth O site, O(17) is bonded to one Ca(1), one Ca(5), one Fe(3), and one Fe(5) atom to form distorted OCa2Fe2 tetrahedra that share  a cornercorner with one O(13)Ca4Al2 octahedra,  a cornercorner with one O(16)Ca4Al2 octahedra,  a cornercorner with one O(14)Ca4AlFe octahedra,  a cornercorner with one O(15)Ca4AlFe octahedra, corners with two equivalent O(12)Ca4Al2 octahedra, corners with two equivalent O(9)Ca4Al2 octahedra,  a cornercorner with one O(19)Ca2Fe2 tetrahedra, and  a cornercorner with one O(20)Ca2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 24-77°. In the eighteenth O site, O(18) is bonded to one Ca(2), one Ca(6), one Fe(2), and one Fe(4) atom to form distorted OCa2Fe2 tetrahedra that share  a cornercorner with one O(13)Ca4Al2 octahedra,  a cornercorner with one O(16)Ca4Al2 octahedra,  a cornercorner with one O(14)Ca4AlFe octahedra,  a cornercorner with one O(15)Ca4AlFe octahedra, corners with two equivalent O(10)Ca4AlFe octahedra, corners with two equivalent O(11)Ca4AlFe octahedra,  a cornercorner with one O(19)Ca2Fe2 tetrahedra, and  a cornercorner with one O(20)Ca2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 23-79°. In the nineteenth O site, O(19) is bonded to one Ca(3), one Ca(7), one Fe(3), and one Fe(4) atom to form distorted OCa2Fe2 tetrahedra that share  a cornercorner with one O(12)Ca4Al2 octahedra,  a cornercorner with one O(9)Ca4Al2 octahedra,  a cornercorner with one O(10)Ca4AlFe octahedra,  a cornercorner with one O(11)Ca4AlFe octahedra, corners with two equivalent O(13)Ca4Al2 octahedra, corners with two equivalent O(16)Ca4Al2 octahedra,  a cornercorner with one O(17)Ca2Fe2 tetrahedra, and  a cornercorner with one O(18)Ca2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 23-79°. In the twentieth O site, O(20) is bonded to one Ca(4), one Ca(8), one Fe(2), and one Fe(5) atom to form distorted OCa2Fe2 tetrahedra that share  a cornercorner with one O(12)Ca4Al2 octahedra,  a cornercorner with one O(9)Ca4Al2 octahedra,  a cornercorner with one O(10)Ca4AlFe octahedra,  a cornercorner with one O(11)Ca4AlFe octahedra, corners with two equivalent O(14)Ca4AlFe octahedra, corners with two equivalent O(15)Ca4AlFe octahedra,  a cornercorner with one O(17)Ca2Fe2 tetrahedra, and  a cornercorner with one O(18)Ca2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 23-78°.