CaMn7O12 crystallizes in the triclinic P1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(1), one O(12), one O(14), one O(15), one O(17), one O(20), one O(22), one O(23), one O(4), one O(6), one O(7), and one O(9) atom to form CaO12 cuboctahedra that share  a faceface with one Mn(11)O6 octahedra,  a faceface with one Mn(12)O6 octahedra,  a faceface with one Mn(13)O6 octahedra,  a faceface with one Mn(14)O6 octahedra,  a faceface with one Mn(4)O6 octahedra,  a faceface with one Mn(5)O6 octahedra,  a faceface with one Mn(6)O6 octahedra, and  a faceface with one Mn(7)O6 octahedra. In the second Ca site, Ca(2) is bonded to one O(10), one O(11), one O(13), one O(16), one O(18), one O(19), one O(2), one O(21), one O(24), one O(3), one O(5), and one O(8) atom to form CaO12 cuboctahedra that share  a faceface with one Mn(11)O6 octahedra,  a faceface with one Mn(12)O6 octahedra,  a faceface with one Mn(13)O6 octahedra,  a faceface with one Mn(14)O6 octahedra,  a faceface with one Mn(4)O6 octahedra,  a faceface with one Mn(5)O6 octahedra,  a faceface with one Mn(6)O6 octahedra, and  a faceface with one Mn(7)O6 octahedra. There are fourteen inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a square co-planar geometry to one O(18), one O(19), one O(21), and one O(24) atom. In the second Mn site, Mn(2) is bonded in a square co-planar geometry to one O(2), one O(3), one O(5), and one O(8) atom. In the third Mn site, Mn(3) is bonded in a distorted square co-planar geometry to one O(10), one O(11), one O(13), and one O(16) atom. In the fourth Mn site, Mn(4) is bonded to one O(1), one O(10), one O(12), one O(22), one O(24), and one O(3) atom to form MnO6 octahedra that share corners with two equivalent Mn(12)O6 octahedra, corners with two equivalent Mn(13)O6 octahedra, corners with two equivalent Mn(14)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 41-43°. In the fifth Mn site, Mn(5) is bonded to one O(14), one O(16), one O(17), one O(19), one O(2), and one O(4) atom to form MnO6 octahedra that share corners with two equivalent Mn(11)O6 octahedra, corners with two equivalent Mn(13)O6 octahedra, corners with two equivalent Mn(14)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 40-44°. In the sixth Mn site, Mn(6) is bonded to one O(11), one O(18), one O(20), one O(6), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(11)O6 octahedra, corners with two equivalent Mn(12)O6 octahedra, corners with two equivalent Mn(14)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 39-43°. In the seventh Mn site, Mn(7) is bonded to one O(13), one O(15), one O(21), one O(23), one O(5), and one O(7) atom to form MnO6 octahedra that share corners with two equivalent Mn(11)O6 octahedra, corners with two equivalent Mn(12)O6 octahedra, corners with two equivalent Mn(13)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 41-43°. In the eighth Mn site, Mn(8) is bonded in a distorted square co-planar geometry to one O(17), one O(20), one O(22), and one O(23) atom. In the ninth Mn site, Mn(9) is bonded in a square co-planar geometry to one O(1), one O(4), one O(6), and one O(7) atom. In the tenth Mn site, Mn(10) is bonded in a distorted square co-planar geometry to one O(12), one O(14), one O(15), and one O(9) atom. In the eleventh Mn site, Mn(11) is bonded to one O(11), one O(2), one O(21), one O(23), one O(4), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, corners with two equivalent Mn(7)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 40-43°. In the twelfth Mn site, Mn(12) is bonded to one O(1), one O(13), one O(15), one O(18), one O(20), and one O(3) atom to form MnO6 octahedra that share corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, corners with two equivalent Mn(7)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 41-42°. In the thirteenth Mn site, Mn(13) is bonded to one O(10), one O(12), one O(17), one O(19), one O(5), and one O(7) atom to form MnO6 octahedra that share corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(7)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 40-42°. In the fourteenth Mn site, Mn(14) is bonded to one O(14), one O(16), one O(22), one O(24), one O(6), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 39-44°. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(12), one Mn(4), and one Mn(9) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(11), one Mn(2), and one Mn(5) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(12), one Mn(2), and one Mn(4) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(11), one Mn(5), and one Mn(9) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(13), one Mn(2), and one Mn(7) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(14), one Mn(6), and one Mn(9) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(13), one Mn(7), and one Mn(9) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ca(2), one Mn(14), one Mn(2), and one Mn(6) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(10), one Mn(11), and one Mn(6) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(13), one Mn(3), and one Mn(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(11), one Mn(3), and one Mn(6) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(10), one Mn(13), and one Mn(4) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(12), one Mn(3), and one Mn(7) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ca(1), one Mn(10), one Mn(14), and one Mn(5) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(10), one Mn(12), and one Mn(7) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Ca(2), one Mn(14), one Mn(3), and one Mn(5) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(13), one Mn(5), and one Mn(8) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(1), one Mn(12), and one Mn(6) atom. In the nineteenth O site, O(19) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(1), one Mn(13), and one Mn(5) atom. In the twentieth O site, O(20) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(12), one Mn(6), and one Mn(8) atom. In the twenty-first O site, O(21) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(1), one Mn(11), and one Mn(7) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(14), one Mn(4), and one Mn(8) atom. In the twenty-third O site, O(23) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(11), one Mn(7), and one Mn(8) atom. In the twenty-fourth O site, O(24) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(1), one Mn(14), and one Mn(4) atom.
CaMn7O12 crystallizes in the triclinic P1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(1), one O(12), one O(14), one O(15), one O(17), one O(20), one O(22), one O(23), one O(4), one O(6), one O(7), and one O(9) atom to form CaO12 cuboctahedra that share  a faceface with one Mn(11)O6 octahedra,  a faceface with one Mn(12)O6 octahedra,  a faceface with one Mn(13)O6 octahedra,  a faceface with one Mn(14)O6 octahedra,  a faceface with one Mn(4)O6 octahedra,  a faceface with one Mn(5)O6 octahedra,  a faceface with one Mn(6)O6 octahedra, and  a faceface with one Mn(7)O6 octahedra. The Ca(1)-O(1) bond length is 2.64 Å. The Ca(1)-O(12) bond length is 2.67 Å. The Ca(1)-O(14) bond length is 2.60 Å. The Ca(1)-O(15) bond length is 2.66 Å. The Ca(1)-O(17) bond length is 2.68 Å. The Ca(1)-O(20) bond length is 2.68 Å. The Ca(1)-O(22) bond length is 2.75 Å. The Ca(1)-O(23) bond length is 2.79 Å. The Ca(1)-O(4) bond length is 2.72 Å. The Ca(1)-O(6) bond length is 2.63 Å. The Ca(1)-O(7) bond length is 2.63 Å. The Ca(1)-O(9) bond length is 2.66 Å. In the second Ca site, Ca(2) is bonded to one O(10), one O(11), one O(13), one O(16), one O(18), one O(19), one O(2), one O(21), one O(24), one O(3), one O(5), and one O(8) atom to form CaO12 cuboctahedra that share  a faceface with one Mn(11)O6 octahedra,  a faceface with one Mn(12)O6 octahedra,  a faceface with one Mn(13)O6 octahedra,  a faceface with one Mn(14)O6 octahedra,  a faceface with one Mn(4)O6 octahedra,  a faceface with one Mn(5)O6 octahedra,  a faceface with one Mn(6)O6 octahedra, and  a faceface with one Mn(7)O6 octahedra. The Ca(2)-O(10) bond length is 2.68 Å. The Ca(2)-O(11) bond length is 2.66 Å. The Ca(2)-O(13) bond length is 2.68 Å. The Ca(2)-O(16) bond length is 2.60 Å. The Ca(2)-O(18) bond length is 2.69 Å. The Ca(2)-O(19) bond length is 2.68 Å. The Ca(2)-O(2) bond length is 2.73 Å. The Ca(2)-O(21) bond length is 2.81 Å. The Ca(2)-O(24) bond length is 2.75 Å. The Ca(2)-O(3) bond length is 2.66 Å. The Ca(2)-O(5) bond length is 2.64 Å. The Ca(2)-O(8) bond length is 2.62 Å. There are fourteen inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a square co-planar geometry to one O(18), one O(19), one O(21), and one O(24) atom. The Mn(1)-O(18) bond length is 1.97 Å. The Mn(1)-O(19) bond length is 1.98 Å. The Mn(1)-O(21) bond length is 1.93 Å. The Mn(1)-O(24) bond length is 1.93 Å. In the second Mn site, Mn(2) is bonded in a square co-planar geometry to one O(2), one O(3), one O(5), and one O(8) atom. The Mn(2)-O(2) bond length is 1.93 Å. The Mn(2)-O(3) bond length is 1.94 Å. The Mn(2)-O(5) bond length is 1.94 Å. The Mn(2)-O(8) bond length is 1.92 Å. In the third Mn site, Mn(3) is bonded in a distorted square co-planar geometry to one O(10), one O(11), one O(13), and one O(16) atom. The Mn(3)-O(10) bond length is 1.98 Å. The Mn(3)-O(11) bond length is 1.93 Å. The Mn(3)-O(13) bond length is 1.98 Å. The Mn(3)-O(16) bond length is 1.93 Å. In the fourth Mn site, Mn(4) is bonded to one O(1), one O(10), one O(12), one O(22), one O(24), and one O(3) atom to form MnO6 octahedra that share corners with two equivalent Mn(12)O6 octahedra, corners with two equivalent Mn(13)O6 octahedra, corners with two equivalent Mn(14)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 41-43°. The Mn(4)-O(1) bond length is 1.92 Å. The Mn(4)-O(10) bond length is 1.98 Å. The Mn(4)-O(12) bond length is 1.98 Å. The Mn(4)-O(22) bond length is 1.90 Å. The Mn(4)-O(24) bond length is 1.90 Å. The Mn(4)-O(3) bond length is 1.93 Å. In the fifth Mn site, Mn(5) is bonded to one O(14), one O(16), one O(17), one O(19), one O(2), and one O(4) atom to form MnO6 octahedra that share corners with two equivalent Mn(11)O6 octahedra, corners with two equivalent Mn(13)O6 octahedra, corners with two equivalent Mn(14)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 40-44°. The Mn(5)-O(14) bond length is 1.90 Å. The Mn(5)-O(16) bond length is 1.90 Å. The Mn(5)-O(17) bond length is 1.98 Å. The Mn(5)-O(19) bond length is 1.98 Å. The Mn(5)-O(2) bond length is 1.91 Å. The Mn(5)-O(4) bond length is 1.91 Å. In the sixth Mn site, Mn(6) is bonded to one O(11), one O(18), one O(20), one O(6), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(11)O6 octahedra, corners with two equivalent Mn(12)O6 octahedra, corners with two equivalent Mn(14)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 39-43°. The Mn(6)-O(11) bond length is 1.90 Å. The Mn(6)-O(18) bond length is 1.98 Å. The Mn(6)-O(20) bond length is 1.97 Å. The Mn(6)-O(6) bond length is 1.91 Å. The Mn(6)-O(8) bond length is 1.91 Å. The Mn(6)-O(9) bond length is 1.90 Å. In the seventh Mn site, Mn(7) is bonded to one O(13), one O(15), one O(21), one O(23), one O(5), and one O(7) atom to form MnO6 octahedra that share corners with two equivalent Mn(11)O6 octahedra, corners with two equivalent Mn(12)O6 octahedra, corners with two equivalent Mn(13)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 41-43°. The Mn(7)-O(13) bond length is 1.98 Å. The Mn(7)-O(15) bond length is 1.98 Å. The Mn(7)-O(21) bond length is 1.90 Å. The Mn(7)-O(23) bond length is 1.89 Å. The Mn(7)-O(5) bond length is 1.93 Å. The Mn(7)-O(7) bond length is 1.92 Å. In the eighth Mn site, Mn(8) is bonded in a distorted square co-planar geometry to one O(17), one O(20), one O(22), and one O(23) atom. The Mn(8)-O(17) bond length is 1.98 Å. The Mn(8)-O(20) bond length is 1.98 Å. The Mn(8)-O(22) bond length is 1.93 Å. The Mn(8)-O(23) bond length is 1.93 Å. In the ninth Mn site, Mn(9) is bonded in a square co-planar geometry to one O(1), one O(4), one O(6), and one O(7) atom. The Mn(9)-O(1) bond length is 1.95 Å. The Mn(9)-O(4) bond length is 1.93 Å. The Mn(9)-O(6) bond length is 1.93 Å. The Mn(9)-O(7) bond length is 1.94 Å. In the tenth Mn site, Mn(10) is bonded in a distorted square co-planar geometry to one O(12), one O(14), one O(15), and one O(9) atom. The Mn(10)-O(12) bond length is 1.98 Å. The Mn(10)-O(14) bond length is 1.93 Å. The Mn(10)-O(15) bond length is 1.98 Å. The Mn(10)-O(9) bond length is 1.93 Å. In the eleventh Mn site, Mn(11) is bonded to one O(11), one O(2), one O(21), one O(23), one O(4), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, corners with two equivalent Mn(7)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 40-43°. The Mn(11)-O(11) bond length is 2.09 Å. The Mn(11)-O(2) bond length is 2.15 Å. The Mn(11)-O(21) bond length is 2.11 Å. The Mn(11)-O(23) bond length is 2.10 Å. The Mn(11)-O(4) bond length is 2.16 Å. The Mn(11)-O(9) bond length is 2.09 Å. In the twelfth Mn site, Mn(12) is bonded to one O(1), one O(13), one O(15), one O(18), one O(20), and one O(3) atom to form MnO6 octahedra that share corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, corners with two equivalent Mn(7)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 41-42°. The Mn(12)-O(1) bond length is 2.16 Å. The Mn(12)-O(13) bond length is 1.99 Å. The Mn(12)-O(15) bond length is 1.99 Å. The Mn(12)-O(18) bond length is 2.00 Å. The Mn(12)-O(20) bond length is 2.00 Å. The Mn(12)-O(3) bond length is 2.15 Å. In the thirteenth Mn site, Mn(13) is bonded to one O(10), one O(12), one O(17), one O(19), one O(5), and one O(7) atom to form MnO6 octahedra that share corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(7)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 40-42°. The Mn(13)-O(10) bond length is 2.00 Å. The Mn(13)-O(12) bond length is 2.00 Å. The Mn(13)-O(17) bond length is 1.98 Å. The Mn(13)-O(19) bond length is 1.99 Å. The Mn(13)-O(5) bond length is 2.16 Å. The Mn(13)-O(7) bond length is 2.17 Å. In the fourteenth Mn site, Mn(14) is bonded to one O(14), one O(16), one O(22), one O(24), one O(6), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra, and  a faceface with one Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 39-44°. The Mn(14)-O(14) bond length is 2.10 Å. The Mn(14)-O(16) bond length is 2.11 Å. The Mn(14)-O(22) bond length is 2.09 Å. The Mn(14)-O(24) bond length is 2.10 Å. The Mn(14)-O(6) bond length is 2.15 Å. The Mn(14)-O(8) bond length is 2.14 Å. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(12), one Mn(4), and one Mn(9) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(11), one Mn(2), and one Mn(5) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(12), one Mn(2), and one Mn(4) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(11), one Mn(5), and one Mn(9) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(13), one Mn(2), and one Mn(7) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(14), one Mn(6), and one Mn(9) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(13), one Mn(7), and one Mn(9) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ca(2), one Mn(14), one Mn(2), and one Mn(6) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(10), one Mn(11), and one Mn(6) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(13), one Mn(3), and one Mn(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(11), one Mn(3), and one Mn(6) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(10), one Mn(13), and one Mn(4) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(12), one Mn(3), and one Mn(7) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ca(1), one Mn(10), one Mn(14), and one Mn(5) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(10), one Mn(12), and one Mn(7) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Ca(2), one Mn(14), one Mn(3), and one Mn(5) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(13), one Mn(5), and one Mn(8) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(1), one Mn(12), and one Mn(6) atom. In the nineteenth O site, O(19) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(1), one Mn(13), and one Mn(5) atom. In the twentieth O site, O(20) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(12), one Mn(6), and one Mn(8) atom. In the twenty-first O site, O(21) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(1), one Mn(11), and one Mn(7) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(14), one Mn(4), and one Mn(8) atom. In the twenty-third O site, O(23) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(11), one Mn(7), and one Mn(8) atom. In the twenty-fourth O site, O(24) is bonded in a 3-coordinate geometry to one Ca(2), one Mn(1), one Mn(14), and one Mn(4) atom.