Sr3Ca5Mn8O20 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P1 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one O(10), one O(14), one O(15), one O(17), one O(18), one O(2), one O(4), one O(7), one O(8), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(10), one O(14), one O(15), one O(17), one O(18), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(15), one O(17), one O(18), one O(2), and one O(4) atom. There are five inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(10), one O(16), one O(19), one O(2), one O(20), one O(7), one O(8), and one O(9) atom. In the second Ca site, Ca(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(16), one O(20), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. In the third Ca site, Ca(3) is bonded in a 11-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(14), one O(15), one O(17), one O(18), one O(3), one O(5), and one O(6) atom. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(13), one O(16), one O(19), one O(2), one O(20), and one O(4) atom. In the fifth Ca site, Ca(5) is bonded in a 10-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(16), one O(19), one O(20), one O(3), one O(5), and one O(6) atom. There are eight inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(14), and one O(7) atom. In the second Mn site, Mn(2) is bonded to one O(1), one O(11), one O(15), one O(16), and one O(8) atom to form corner-sharing MnO5 square pyramids. The corner-sharing octahedral tilt angles range from 2-21°. In the third Mn site, Mn(3) is bonded to one O(12), one O(14), one O(2), one O(3), and one O(9) atom to form MnO5 square pyramids that share corners with two equivalent Mn(4)O6 octahedra and corners with two equivalent Mn(7)O5 square pyramids. The corner-sharing octahedral tilt angles range from 12-14°. In the fourth Mn site, Mn(4) is bonded to one O(10), one O(13), one O(15), one O(16), one O(2), and one O(3) atom to form corner-sharing MnO6 octahedra. In the fifth Mn site, Mn(5) is bonded to one O(17), one O(19), one O(4), one O(5), and one O(7) atom to form MnO5 square pyramids that share corners with two equivalent Mn(6)O6 octahedra and corners with two equivalent Mn(7)O5 square pyramids. The corner-sharing octahedral tilt angles range from 11-19°. In the sixth Mn site, Mn(6) is bonded to one O(11), one O(18), one O(20), one O(4), one O(5), and one O(8) atom to form corner-sharing MnO6 octahedra. In the seventh Mn site, Mn(7) is bonded to one O(12), one O(17), one O(19), one O(6), and one O(9) atom to form corner-sharing MnO5 square pyramids. In the eighth Mn site, Mn(8) is bonded to one O(10), one O(13), one O(18), one O(20), and one O(6) atom to form MnO5 square pyramids that share corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and  a cornercorner with one Mn(7)O5 square pyramid. The corner-sharing octahedral tilt angles range from 1-13°. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ca(2), one Ca(3), one Ca(5), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), one Ca(1), one Ca(4), one Mn(3), and one Mn(4) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Sr(2), one Ca(2), one Ca(3), one Ca(5), one Mn(3), and one Mn(4) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), one Ca(4), one Mn(5), and one Mn(6) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Sr(2), one Ca(2), one Ca(3), one Ca(5), one Mn(5), and one Mn(6) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(2), one Ca(2), one Ca(3), one Ca(5), one Mn(7), and one Mn(8) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Mn(1), and one Mn(5) atom. In the eighth O site, O(8) is bonded to one Sr(1), one Sr(2), one Ca(1), one Ca(2), one Mn(2), and one Mn(6) atom to form distorted OSr2Ca2Mn2 octahedra that share corners with two equivalent O(17)Sr3CaMn2 octahedra, edges with two equivalent O(10)Sr2Ca2Mn2 octahedra,  a faceface with one O(20)Ca4Mn2 octahedra,  a faceface with one O(15)Sr3CaMn2 octahedra, and  a faceface with one O(18)Sr3CaMn2 octahedra. The corner-sharing octahedral tilt angles range from 60-62°. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Ca(1), one Ca(2), one Mn(3), and one Mn(7) atom. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one Ca(1), one Ca(2), one Mn(4), and one Mn(8) atom to form distorted OSr2Ca2Mn2 octahedra that share corners with two equivalent O(17)Sr3CaMn2 octahedra, corners with two equivalent O(13)SrCa3Mn2 octahedra, edges with two equivalent O(8)Sr2Ca2Mn2 octahedra,  a faceface with one O(20)Ca4Mn2 octahedra,  a faceface with one O(15)Sr3CaMn2 octahedra, and  a faceface with one O(18)Sr3CaMn2 octahedra. The corner-sharing octahedral tilt angles range from 4-65°. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Sr(3), one Ca(3), one Ca(4), one Ca(5), one Mn(2), and one Mn(6) atom. In the twelfth O site, O(12) is bonded in a 2-coordinate geometry to one Sr(3), one Ca(3), one Ca(4), one Ca(5), one Mn(3), and one Mn(7) atom. In the thirteenth O site, O(13) is bonded to one Sr(3), one Ca(3), one Ca(4), one Ca(5), one Mn(4), and one Mn(8) atom to form distorted OSrCa3Mn2 octahedra that share corners with two equivalent O(10)Sr2Ca2Mn2 octahedra, corners with two equivalent O(17)Sr3CaMn2 octahedra,  a faceface with one O(20)Ca4Mn2 octahedra,  a faceface with one O(15)Sr3CaMn2 octahedra, and  a faceface with one O(18)Sr3CaMn2 octahedra. The corner-sharing octahedral tilt angles range from 4-60°. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Ca(3), one Mn(1), and one Mn(3) atom. In the fifteenth O site, O(15) is bonded to one Sr(1), one Sr(2), one Sr(3), one Ca(3), one Mn(2), and one Mn(4) atom to form distorted OSr3CaMn2 octahedra that share corners with four equivalent O(17)Sr3CaMn2 octahedra, edges with two equivalent O(18)Sr3CaMn2 octahedra,  a faceface with one O(10)Sr2Ca2Mn2 octahedra,  a faceface with one O(8)Sr2Ca2Mn2 octahedra, and  a faceface with one O(13)SrCa3Mn2 octahedra. The corner-sharing octahedral tilt angles range from 2-11°. In the sixteenth O site, O(16) is bonded in a 6-coordinate geometry to one Ca(1), one Ca(2), one Ca(4), one Ca(5), one Mn(2), and one Mn(4) atom. In the seventeenth O site, O(17) is bonded to one Sr(1), one Sr(2), one Sr(3), one Ca(3), one Mn(5), and one Mn(7) atom to form distorted OSr3CaMn2 octahedra that share corners with two equivalent O(10)Sr2Ca2Mn2 octahedra, corners with two equivalent O(8)Sr2Ca2Mn2 octahedra, corners with two equivalent O(13)SrCa3Mn2 octahedra, corners with four equivalent O(15)Sr3CaMn2 octahedra, and edges with two equivalent O(18)Sr3CaMn2 octahedra. The corner-sharing octahedral tilt angles range from 2-65°. In the eighteenth O site, O(18) is bonded to one Sr(1), one Sr(2), one Sr(3), one Ca(3), one Mn(6), and one Mn(8) atom to form distorted OSr3CaMn2 octahedra that share corners with two equivalent O(20)Ca4Mn2 octahedra, edges with two equivalent O(15)Sr3CaMn2 octahedra, edges with two equivalent O(17)Sr3CaMn2 octahedra,  a faceface with one O(10)Sr2Ca2Mn2 octahedra,  a faceface with one O(8)Sr2Ca2Mn2 octahedra, and  a faceface with one O(13)SrCa3Mn2 octahedra. The corner-sharing octahedral tilt angles range from 4-9°. In the nineteenth O site, O(19) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(4), one Ca(5), one Mn(5), and one Mn(7) atom. In the twentieth O site, O(20) is bonded to one Ca(1), one Ca(2), one Ca(4), one Ca(5), one Mn(6), and one Mn(8) atom to form distorted OCa4Mn2 octahedra that share corners with two equivalent O(18)Sr3CaMn2 octahedra,  a faceface with one O(10)Sr2Ca2Mn2 octahedra,  a faceface with one O(8)Sr2Ca2Mn2 octahedra, and  a faceface with one O(13)SrCa3Mn2 octahedra. The corner-sharing octahedral tilt angles range from 4-9°.
Sr3Ca5Mn8O20 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P1 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one O(10), one O(14), one O(15), one O(17), one O(18), one O(2), one O(4), one O(7), one O(8), and one O(9) atom. The Sr(1)-O(10) bond length is 2.71 Å. The Sr(1)-O(14) bond length is 2.79 Å. The Sr(1)-O(15) bond length is 2.80 Å. The Sr(1)-O(17) bond length is 2.77 Å. The Sr(1)-O(18) bond length is 2.82 Å. The Sr(1)-O(2) bond length is 2.93 Å. The Sr(1)-O(4) bond length is 2.85 Å. The Sr(1)-O(7) bond length is 2.71 Å. The Sr(1)-O(8) bond length is 2.76 Å. The Sr(1)-O(9) bond length is 2.76 Å. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(10), one O(14), one O(15), one O(17), one O(18), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. The Sr(2)-O(10) bond length is 2.69 Å. The Sr(2)-O(14) bond length is 3.05 Å. The Sr(2)-O(15) bond length is 2.76 Å. The Sr(2)-O(17) bond length is 2.82 Å. The Sr(2)-O(18) bond length is 2.63 Å. The Sr(2)-O(3) bond length is 2.87 Å. The Sr(2)-O(5) bond length is 3.00 Å. The Sr(2)-O(6) bond length is 2.77 Å. The Sr(2)-O(8) bond length is 2.78 Å. The Sr(2)-O(9) bond length is 2.92 Å. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(15), one O(17), one O(18), one O(2), and one O(4) atom. The Sr(3)-O(11) bond length is 2.65 Å. The Sr(3)-O(12) bond length is 2.69 Å. The Sr(3)-O(13) bond length is 2.65 Å. The Sr(3)-O(14) bond length is 2.54 Å. The Sr(3)-O(15) bond length is 2.79 Å. The Sr(3)-O(17) bond length is 2.84 Å. The Sr(3)-O(18) bond length is 2.63 Å. The Sr(3)-O(2) bond length is 2.84 Å. The Sr(3)-O(4) bond length is 2.57 Å. There are five inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(10), one O(16), one O(19), one O(2), one O(20), one O(7), one O(8), and one O(9) atom. The Ca(1)-O(10) bond length is 2.47 Å. The Ca(1)-O(16) bond length is 2.47 Å. The Ca(1)-O(19) bond length is 2.63 Å. The Ca(1)-O(2) bond length is 2.63 Å. The Ca(1)-O(20) bond length is 2.49 Å. The Ca(1)-O(7) bond length is 2.33 Å. The Ca(1)-O(8) bond length is 2.80 Å. The Ca(1)-O(9) bond length is 2.67 Å. In the second Ca site, Ca(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(16), one O(20), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. The Ca(2)-O(1) bond length is 2.96 Å. The Ca(2)-O(10) bond length is 2.63 Å. The Ca(2)-O(16) bond length is 2.83 Å. The Ca(2)-O(20) bond length is 2.66 Å. The Ca(2)-O(3) bond length is 2.50 Å. The Ca(2)-O(5) bond length is 2.86 Å. The Ca(2)-O(6) bond length is 2.56 Å. The Ca(2)-O(8) bond length is 2.56 Å. The Ca(2)-O(9) bond length is 2.83 Å. In the third Ca site, Ca(3) is bonded in a 11-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(14), one O(15), one O(17), one O(18), one O(3), one O(5), and one O(6) atom. The Ca(3)-O(1) bond length is 2.98 Å. The Ca(3)-O(11) bond length is 2.83 Å. The Ca(3)-O(12) bond length is 3.16 Å. The Ca(3)-O(13) bond length is 2.66 Å. The Ca(3)-O(14) bond length is 3.07 Å. The Ca(3)-O(15) bond length is 2.55 Å. The Ca(3)-O(17) bond length is 2.74 Å. The Ca(3)-O(18) bond length is 2.53 Å. The Ca(3)-O(3) bond length is 3.07 Å. The Ca(3)-O(5) bond length is 2.68 Å. The Ca(3)-O(6) bond length is 2.85 Å. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(13), one O(16), one O(19), one O(2), one O(20), and one O(4) atom. The Ca(4)-O(11) bond length is 2.52 Å. The Ca(4)-O(12) bond length is 2.69 Å. The Ca(4)-O(13) bond length is 2.43 Å. The Ca(4)-O(16) bond length is 2.55 Å. The Ca(4)-O(19) bond length is 2.50 Å. The Ca(4)-O(2) bond length is 2.70 Å. The Ca(4)-O(20) bond length is 2.37 Å. The Ca(4)-O(4) bond length is 2.74 Å. In the fifth Ca site, Ca(5) is bonded in a 10-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(16), one O(19), one O(20), one O(3), one O(5), and one O(6) atom. The Ca(5)-O(1) bond length is 2.28 Å. The Ca(5)-O(11) bond length is 2.72 Å. The Ca(5)-O(12) bond length is 2.86 Å. The Ca(5)-O(13) bond length is 2.57 Å. The Ca(5)-O(16) bond length is 2.88 Å. The Ca(5)-O(19) bond length is 2.98 Å. The Ca(5)-O(20) bond length is 2.72 Å. The Ca(5)-O(3) bond length is 2.72 Å. The Ca(5)-O(5) bond length is 2.61 Å. The Ca(5)-O(6) bond length is 2.48 Å. There are eight inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(14), and one O(7) atom. The Mn(1)-O(1) bond length is 1.86 Å. The Mn(1)-O(14) bond length is 1.90 Å. The Mn(1)-O(7) bond length is 1.88 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(11), one O(15), one O(16), and one O(8) atom to form corner-sharing MnO5 square pyramids. The corner-sharing octahedral tilt angles range from 2-21°. The Mn(2)-O(1) bond length is 2.05 Å. The Mn(2)-O(11) bond length is 1.93 Å. The Mn(2)-O(15) bond length is 1.97 Å. The Mn(2)-O(16) bond length is 1.92 Å. The Mn(2)-O(8) bond length is 1.96 Å. In the third Mn site, Mn(3) is bonded to one O(12), one O(14), one O(2), one O(3), and one O(9) atom to form MnO5 square pyramids that share corners with two equivalent Mn(4)O6 octahedra and corners with two equivalent Mn(7)O5 square pyramids. The corner-sharing octahedral tilt angles range from 12-14°. The Mn(3)-O(12) bond length is 1.97 Å. The Mn(3)-O(14) bond length is 2.05 Å. The Mn(3)-O(2) bond length is 1.90 Å. The Mn(3)-O(3) bond length is 1.95 Å. The Mn(3)-O(9) bond length is 2.02 Å. In the fourth Mn site, Mn(4) is bonded to one O(10), one O(13), one O(15), one O(16), one O(2), and one O(3) atom to form corner-sharing MnO6 octahedra. The Mn(4)-O(10) bond length is 2.02 Å. The Mn(4)-O(13) bond length is 2.02 Å. The Mn(4)-O(15) bond length is 2.03 Å. The Mn(4)-O(16) bond length is 1.99 Å. The Mn(4)-O(2) bond length is 1.94 Å. The Mn(4)-O(3) bond length is 2.00 Å. In the fifth Mn site, Mn(5) is bonded to one O(17), one O(19), one O(4), one O(5), and one O(7) atom to form MnO5 square pyramids that share corners with two equivalent Mn(6)O6 octahedra and corners with two equivalent Mn(7)O5 square pyramids. The corner-sharing octahedral tilt angles range from 11-19°. The Mn(5)-O(17) bond length is 2.04 Å. The Mn(5)-O(19) bond length is 1.97 Å. The Mn(5)-O(4) bond length is 1.90 Å. The Mn(5)-O(5) bond length is 1.95 Å. The Mn(5)-O(7) bond length is 2.08 Å. In the sixth Mn site, Mn(6) is bonded to one O(11), one O(18), one O(20), one O(4), one O(5), and one O(8) atom to form corner-sharing MnO6 octahedra. The Mn(6)-O(11) bond length is 1.98 Å. The Mn(6)-O(18) bond length is 2.03 Å. The Mn(6)-O(20) bond length is 2.01 Å. The Mn(6)-O(4) bond length is 1.94 Å. The Mn(6)-O(5) bond length is 2.01 Å. The Mn(6)-O(8) bond length is 2.01 Å. In the seventh Mn site, Mn(7) is bonded to one O(12), one O(17), one O(19), one O(6), and one O(9) atom to form corner-sharing MnO5 square pyramids. The Mn(7)-O(12) bond length is 1.94 Å. The Mn(7)-O(17) bond length is 2.00 Å. The Mn(7)-O(19) bond length is 1.94 Å. The Mn(7)-O(6) bond length is 1.90 Å. The Mn(7)-O(9) bond length is 1.96 Å. In the eighth Mn site, Mn(8) is bonded to one O(10), one O(13), one O(18), one O(20), and one O(6) atom to form MnO5 square pyramids that share corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and  a cornercorner with one Mn(7)O5 square pyramid. The corner-sharing octahedral tilt angles range from 1-13°. The Mn(8)-O(10) bond length is 1.90 Å. The Mn(8)-O(13) bond length is 1.91 Å. The Mn(8)-O(18) bond length is 1.92 Å. The Mn(8)-O(20) bond length is 1.91 Å. The Mn(8)-O(6) bond length is 1.90 Å. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ca(2), one Ca(3), one Ca(5), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), one Ca(1), one Ca(4), one Mn(3), and one Mn(4) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Sr(2), one Ca(2), one Ca(3), one Ca(5), one Mn(3), and one Mn(4) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), one Ca(4), one Mn(5), and one Mn(6) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Sr(2), one Ca(2), one Ca(3), one Ca(5), one Mn(5), and one Mn(6) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(2), one Ca(2), one Ca(3), one Ca(5), one Mn(7), and one Mn(8) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Mn(1), and one Mn(5) atom. In the eighth O site, O(8) is bonded to one Sr(1), one Sr(2), one Ca(1), one Ca(2), one Mn(2), and one Mn(6) atom to form distorted OSr2Ca2Mn2 octahedra that share corners with two equivalent O(17)Sr3CaMn2 octahedra, edges with two equivalent O(10)Sr2Ca2Mn2 octahedra,  a faceface with one O(20)Ca4Mn2 octahedra,  a faceface with one O(15)Sr3CaMn2 octahedra, and  a faceface with one O(18)Sr3CaMn2 octahedra. The corner-sharing octahedral tilt angles range from 60-62°. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Ca(1), one Ca(2), one Mn(3), and one Mn(7) atom. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one Ca(1), one Ca(2), one Mn(4), and one Mn(8) atom to form distorted OSr2Ca2Mn2 octahedra that share corners with two equivalent O(17)Sr3CaMn2 octahedra, corners with two equivalent O(13)SrCa3Mn2 octahedra, edges with two equivalent O(8)Sr2Ca2Mn2 octahedra,  a faceface with one O(20)Ca4Mn2 octahedra,  a faceface with one O(15)Sr3CaMn2 octahedra, and  a faceface with one O(18)Sr3CaMn2 octahedra. The corner-sharing octahedral tilt angles range from 4-65°. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Sr(3), one Ca(3), one Ca(4), one Ca(5), one Mn(2), and one Mn(6) atom. In the twelfth O site, O(12) is bonded in a 2-coordinate geometry to one Sr(3), one Ca(3), one Ca(4), one Ca(5), one Mn(3), and one Mn(7) atom. In the thirteenth O site, O(13) is bonded to one Sr(3), one Ca(3), one Ca(4), one Ca(5), one Mn(4), and one Mn(8) atom to form distorted OSrCa3Mn2 octahedra that share corners with two equivalent O(10)Sr2Ca2Mn2 octahedra, corners with two equivalent O(17)Sr3CaMn2 octahedra,  a faceface with one O(20)Ca4Mn2 octahedra,  a faceface with one O(15)Sr3CaMn2 octahedra, and  a faceface with one O(18)Sr3CaMn2 octahedra. The corner-sharing octahedral tilt angles range from 4-60°. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Ca(3), one Mn(1), and one Mn(3) atom. In the fifteenth O site, O(15) is bonded to one Sr(1), one Sr(2), one Sr(3), one Ca(3), one Mn(2), and one Mn(4) atom to form distorted OSr3CaMn2 octahedra that share corners with four equivalent O(17)Sr3CaMn2 octahedra, edges with two equivalent O(18)Sr3CaMn2 octahedra,  a faceface with one O(10)Sr2Ca2Mn2 octahedra,  a faceface with one O(8)Sr2Ca2Mn2 octahedra, and  a faceface with one O(13)SrCa3Mn2 octahedra. The corner-sharing octahedral tilt angles range from 2-11°. In the sixteenth O site, O(16) is bonded in a 6-coordinate geometry to one Ca(1), one Ca(2), one Ca(4), one Ca(5), one Mn(2), and one Mn(4) atom. In the seventeenth O site, O(17) is bonded to one Sr(1), one Sr(2), one Sr(3), one Ca(3), one Mn(5), and one Mn(7) atom to form distorted OSr3CaMn2 octahedra that share corners with two equivalent O(10)Sr2Ca2Mn2 octahedra, corners with two equivalent O(8)Sr2Ca2Mn2 octahedra, corners with two equivalent O(13)SrCa3Mn2 octahedra, corners with four equivalent O(15)Sr3CaMn2 octahedra, and edges with two equivalent O(18)Sr3CaMn2 octahedra. The corner-sharing octahedral tilt angles range from 2-65°. In the eighteenth O site, O(18) is bonded to one Sr(1), one Sr(2), one Sr(3), one Ca(3), one Mn(6), and one Mn(8) atom to form distorted OSr3CaMn2 octahedra that share corners with two equivalent O(20)Ca4Mn2 octahedra, edges with two equivalent O(15)Sr3CaMn2 octahedra, edges with two equivalent O(17)Sr3CaMn2 octahedra,  a faceface with one O(10)Sr2Ca2Mn2 octahedra,  a faceface with one O(8)Sr2Ca2Mn2 octahedra, and  a faceface with one O(13)SrCa3Mn2 octahedra. The corner-sharing octahedral tilt angles range from 4-9°. In the nineteenth O site, O(19) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(4), one Ca(5), one Mn(5), and one Mn(7) atom. In the twentieth O site, O(20) is bonded to one Ca(1), one Ca(2), one Ca(4), one Ca(5), one Mn(6), and one Mn(8) atom to form distorted OCa4Mn2 octahedra that share corners with two equivalent O(18)Sr3CaMn2 octahedra,  a faceface with one O(10)Sr2Ca2Mn2 octahedra,  a faceface with one O(8)Sr2Ca2Mn2 octahedra, and  a faceface with one O(13)SrCa3Mn2 octahedra. The corner-sharing octahedral tilt angles range from 4-9°.