Na7Mn10O24 is beta indium sulfide-derived structured and crystallizes in the monoclinic Cm space group. There are seven inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(12), one O(3), and two equivalent O(6) atoms to form distorted NaO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra, and corners with four equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-66°. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(3), one O(8), two equivalent O(6), and two equivalent O(7) atoms. In the third Na site, Na(3) is bonded to one O(11), one O(13), and two equivalent O(5) atoms to form NaO4 tetrahedra that share  a cornercorner with one Na(5)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Mn(7)O6 octahedra, corners with three equivalent Mn(6)O6 octahedra, and corners with four equivalent Mn(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-72°. In the fourth Na site, Na(4) is bonded in a rectangular see-saw-like geometry to one O(10), one O(8), and two equivalent O(7) atoms. In the fifth Na site, Na(5) is bonded to one O(13), one O(17), two equivalent O(14), and two equivalent O(15) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(3)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with two equivalent Na(7)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(6)O6 octahedra, and edges with four equivalent Mn(7)O6 octahedra. In the sixth Na site, Na(6) is bonded to one O(18), one O(4), and two equivalent O(14) atoms to form NaO4 tetrahedra that share  a cornercorner with one Mn(4)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra, and corners with four equivalent Mn(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-76°. In the seventh Na site, Na(7) is bonded to one O(16), one O(9), and two equivalent O(15) atoms to form NaO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra, corners with three equivalent Mn(6)O6 octahedra, and corners with four equivalent Mn(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-75°. There are seven inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(18), one O(2), two equivalent O(1), and two equivalent O(14) atoms to form MnO6 octahedra that share corners with three equivalent Na(6)O4 tetrahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Mn(4)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(7)O6 octahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(10), one O(2), one O(3), one O(4), and one O(6) atom to form MnO6 octahedra that share  a cornercorner with one Na(6)O4 tetrahedra, corners with two equivalent Na(1)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. In the third Mn site, Mn(3) is bonded to one O(12), one O(9), two equivalent O(5), and two equivalent O(7) atoms to form MnO6 octahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra,  an edgeedge with one Mn(6)O6 octahedra, and edges with four equivalent Mn(5)O6 octahedra. In the fourth Mn site, Mn(4) is bonded to one O(10), one O(4), two equivalent O(1), and two equivalent O(6) atoms to form MnO6 octahedra that share  a cornercorner with one Na(6)O4 tetrahedra, corners with two equivalent Na(1)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, and edges with four equivalent Mn(2)O6 octahedra. In the fifth Mn site, Mn(5) is bonded to one O(11), one O(12), one O(5), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra,  an edgeedge with one Mn(6)O6 octahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Mn(5)O6 octahedra. In the sixth Mn site, Mn(6) is bonded to one O(11), one O(16), two equivalent O(15), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with three equivalent Na(3)O4 tetrahedra, corners with three equivalent Na(7)O4 tetrahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, edges with two equivalent Mn(5)O6 octahedra, and edges with two equivalent Mn(7)O6 octahedra. In the seventh Mn site, Mn(7) is bonded to one O(13), one O(14), one O(15), one O(16), one O(17), and one O(18) atom to form MnO6 octahedra that share  a cornercorner with one Na(3)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with two equivalent Na(7)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(6)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, and edges with two equivalent Mn(7)O6 octahedra. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(2), and one Mn(4) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1) and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded to one Na(1), one Na(2), and two equivalent Mn(2) atoms to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(12)NaMn3 tetrahedra, corners with two equivalent O(10)NaMn3 tetrahedra,  a cornercorner with one O(8)Na2Mn2 trigonal pyramid, corners with two equivalent O(6)Na2Mn2 trigonal pyramids, corners with two equivalent O(7)Na2Mn2 trigonal pyramids,  an edgeedge with one O(4)NaMn3 tetrahedra, and edges with two equivalent O(6)Na2Mn2 trigonal pyramids. In the fourth O site, O(4) is bonded to one Na(6), one Mn(4), and two equivalent Mn(2) atoms to form ONaMn3 tetrahedra that share corners with three equivalent O(10)NaMn3 tetrahedra,  a cornercorner with one O(18)NaMn3 trigonal pyramid, corners with two equivalent O(14)Na2Mn2 trigonal pyramids,  an edgeedge with one O(3)Na2Mn2 trigonal pyramid, and edges with two equivalent O(6)Na2Mn2 trigonal pyramids. In the fifth O site, O(5) is bonded to one Na(3), one Mn(3), one Mn(5), and one Mn(6) atom to form ONaMn3 tetrahedra that share  a cornercorner with one O(11)NaMn3 tetrahedra,  a cornercorner with one O(5)NaMn3 tetrahedra, corners with two equivalent O(9)NaMn3 tetrahedra,  a cornercorner with one O(13)Na2Mn2 trigonal pyramid,  a cornercorner with one O(8)Na2Mn2 trigonal pyramid, corners with two equivalent O(15)Na2Mn2 trigonal pyramids, corners with three equivalent O(7)Na2Mn2 trigonal pyramids,  an edgeedge with one O(11)NaMn3 tetrahedra,  an edgeedge with one O(12)NaMn3 tetrahedra, and  an edgeedge with one O(5)NaMn3 tetrahedra. In the sixth O site, O(6) is bonded to one Na(1), one Na(2), one Mn(2), and one Mn(4) atom to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(12)NaMn3 tetrahedra, corners with two equivalent O(10)NaMn3 tetrahedra,  a cornercorner with one O(3)Na2Mn2 trigonal pyramid,  a cornercorner with one O(6)Na2Mn2 trigonal pyramid,  a cornercorner with one O(8)Na2Mn2 trigonal pyramid, corners with two equivalent O(7)Na2Mn2 trigonal pyramids,  an edgeedge with one O(4)NaMn3 tetrahedra,  an edgeedge with one O(3)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(6)Na2Mn2 trigonal pyramid. In the seventh O site, O(7) is bonded to one Na(2), one Na(4), one Mn(3), and one Mn(5) atom to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(11)NaMn3 tetrahedra, corners with two equivalent O(12)NaMn3 tetrahedra, corners with three equivalent O(5)NaMn3 tetrahedra,  a cornercorner with one O(3)Na2Mn2 trigonal pyramid,  a cornercorner with one O(7)Na2Mn2 trigonal pyramid,  a cornercorner with one O(8)Na2Mn2 trigonal pyramid, corners with two equivalent O(6)Na2Mn2 trigonal pyramids,  an edgeedge with one O(9)NaMn3 tetrahedra,  an edgeedge with one O(7)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(8)Na2Mn2 trigonal pyramid. In the eighth O site, O(8) is bonded to one Na(2), one Na(4), and two equivalent Mn(5) atoms to form ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra, corners with two equivalent O(11)NaMn3 tetrahedra, corners with two equivalent O(12)NaMn3 tetrahedra, corners with two equivalent O(5)NaMn3 tetrahedra,  a cornercorner with one O(3)Na2Mn2 trigonal pyramid, corners with two equivalent O(6)Na2Mn2 trigonal pyramids, corners with two equivalent O(7)Na2Mn2 trigonal pyramids,  an edgeedge with one O(9)NaMn3 tetrahedra, and edges with two equivalent O(7)Na2Mn2 trigonal pyramids. In the ninth O site, O(9) is bonded to one Na(7), one Mn(3), and two equivalent Mn(5) atoms to form distorted ONaMn3 tetrahedra that share corners with two equivalent O(11)NaMn3 tetrahedra, corners with three equivalent O(12)NaMn3 tetrahedra, corners with four equivalent O(5)NaMn3 tetrahedra, corners with two equivalent O(15)Na2Mn2 trigonal pyramids,  an edgeedge with one O(8)Na2Mn2 trigonal pyramid, and edges with two equivalent O(7)Na2Mn2 trigonal pyramids. In the tenth O site, O(10) is bonded to one Na(4), one Mn(4), and two equivalent Mn(2) atoms to form distorted ONaMn3 tetrahedra that share corners with three equivalent O(4)NaMn3 tetrahedra,  a cornercorner with one O(8)Na2Mn2 trigonal pyramid, corners with two equivalent O(3)Na2Mn2 trigonal pyramids, corners with two equivalent O(7)Na2Mn2 trigonal pyramids, and corners with four equivalent O(6)Na2Mn2 trigonal pyramids. In the eleventh O site, O(11) is bonded to one Na(3), one Mn(6), and two equivalent Mn(5) atoms to form ONaMn3 tetrahedra that share corners with two equivalent O(5)NaMn3 tetrahedra, corners with two equivalent O(9)NaMn3 tetrahedra,  a cornercorner with one O(13)Na2Mn2 trigonal pyramid, corners with two equivalent O(15)Na2Mn2 trigonal pyramids, corners with two equivalent O(7)Na2Mn2 trigonal pyramids, corners with two equivalent O(8)Na2Mn2 trigonal pyramids,  an edgeedge with one O(12)NaMn3 tetrahedra, and edges with two equivalent O(5)NaMn3 tetrahedra. In the twelfth O site, O(12) is bonded to one Na(1), one Mn(3), and two equivalent Mn(5) atoms to form distorted ONaMn3 tetrahedra that share corners with three equivalent O(9)NaMn3 tetrahedra,  a cornercorner with one O(3)Na2Mn2 trigonal pyramid, corners with two equivalent O(6)Na2Mn2 trigonal pyramids, corners with two equivalent O(8)Na2Mn2 trigonal pyramids, corners with four equivalent O(7)Na2Mn2 trigonal pyramids,  an edgeedge with one O(11)NaMn3 tetrahedra, and edges with two equivalent O(5)NaMn3 tetrahedra. In the thirteenth O site, O(13) is bonded to one Na(3), one Na(5), and two equivalent Mn(7) atoms to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(11)NaMn3 tetrahedra, corners with two equivalent O(5)NaMn3 tetrahedra, corners with four equivalent O(15)Na2Mn2 trigonal pyramids,  an edgeedge with one O(18)NaMn3 trigonal pyramid, and edges with two equivalent O(14)Na2Mn2 trigonal pyramids. In the fourteenth O site, O(14) is bonded to one Na(5), one Na(6), one Mn(1), and one Mn(7) atom to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(4)NaMn3 tetrahedra,  a cornercorner with one O(14)Na2Mn2 trigonal pyramid,  a cornercorner with one O(18)NaMn3 trigonal pyramid, corners with three equivalent O(15)Na2Mn2 trigonal pyramids,  an edgeedge with one O(13)Na2Mn2 trigonal pyramid,  an edgeedge with one O(14)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(18)NaMn3 trigonal pyramid. In the fifteenth O site, O(15) is bonded to one Na(5), one Na(7), one Mn(6), and one Mn(7) atom to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(11)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra, corners with two equivalent O(5)NaMn3 tetrahedra,  a cornercorner with one O(15)Na2Mn2 trigonal pyramid,  a cornercorner with one O(18)NaMn3 trigonal pyramid, corners with two equivalent O(13)Na2Mn2 trigonal pyramids, corners with three equivalent O(14)Na2Mn2 trigonal pyramids, and  an edgeedge with one O(15)Na2Mn2 trigonal pyramid. In the sixteenth O site, O(16) is bonded in a distorted rectangular see-saw-like geometry to one Na(7), one Mn(6), and two equivalent Mn(7) atoms. In the seventeenth O site, O(17) is bonded in a distorted trigonal non-coplanar geometry to one Na(5) and two equivalent Mn(7) atoms. In the eighteenth O site, O(18) is bonded to one Na(6), one Mn(1), and two equivalent Mn(7) atoms to form distorted ONaMn3 trigonal pyramids that share  a cornercorner with one O(4)NaMn3 tetrahedra, corners with two equivalent O(14)Na2Mn2 trigonal pyramids, corners with two equivalent O(15)Na2Mn2 trigonal pyramids,  an edgeedge with one O(13)Na2Mn2 trigonal pyramid, and edges with two equivalent O(14)Na2Mn2 trigonal pyramids.
Na7Mn10O24 is beta indium sulfide-derived structured and crystallizes in the monoclinic Cm space group. There are seven inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(12), one O(3), and two equivalent O(6) atoms to form distorted NaO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra, and corners with four equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-66°. The Na(1)-O(12) bond length is 2.40 Å. The Na(1)-O(3) bond length is 2.21 Å. Both Na(1)-O(6) bond lengths are 2.19 Å. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(3), one O(8), two equivalent O(6), and two equivalent O(7) atoms. The Na(2)-O(3) bond length is 2.29 Å. The Na(2)-O(8) bond length is 2.32 Å. Both Na(2)-O(6) bond lengths are 2.36 Å. Both Na(2)-O(7) bond lengths are 2.40 Å. In the third Na site, Na(3) is bonded to one O(11), one O(13), and two equivalent O(5) atoms to form NaO4 tetrahedra that share  a cornercorner with one Na(5)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Mn(7)O6 octahedra, corners with three equivalent Mn(6)O6 octahedra, and corners with four equivalent Mn(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-72°. The Na(3)-O(11) bond length is 2.20 Å. The Na(3)-O(13) bond length is 2.19 Å. Both Na(3)-O(5) bond lengths are 2.16 Å. In the fourth Na site, Na(4) is bonded in a rectangular see-saw-like geometry to one O(10), one O(8), and two equivalent O(7) atoms. The Na(4)-O(10) bond length is 2.31 Å. The Na(4)-O(8) bond length is 2.26 Å. Both Na(4)-O(7) bond lengths are 2.23 Å. In the fifth Na site, Na(5) is bonded to one O(13), one O(17), two equivalent O(14), and two equivalent O(15) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(3)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with two equivalent Na(7)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(6)O6 octahedra, and edges with four equivalent Mn(7)O6 octahedra. The Na(5)-O(13) bond length is 2.21 Å. The Na(5)-O(17) bond length is 2.18 Å. Both Na(5)-O(14) bond lengths are 2.29 Å. Both Na(5)-O(15) bond lengths are 2.34 Å. In the sixth Na site, Na(6) is bonded to one O(18), one O(4), and two equivalent O(14) atoms to form NaO4 tetrahedra that share  a cornercorner with one Mn(4)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra, and corners with four equivalent Mn(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-76°. The Na(6)-O(18) bond length is 2.16 Å. The Na(6)-O(4) bond length is 2.13 Å. Both Na(6)-O(14) bond lengths are 2.14 Å. In the seventh Na site, Na(7) is bonded to one O(16), one O(9), and two equivalent O(15) atoms to form NaO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra, corners with three equivalent Mn(6)O6 octahedra, and corners with four equivalent Mn(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-75°. The Na(7)-O(16) bond length is 2.14 Å. The Na(7)-O(9) bond length is 2.18 Å. Both Na(7)-O(15) bond lengths are 2.12 Å. There are seven inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(18), one O(2), two equivalent O(1), and two equivalent O(14) atoms to form MnO6 octahedra that share corners with three equivalent Na(6)O4 tetrahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Mn(4)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(7)O6 octahedra. The Mn(1)-O(18) bond length is 2.08 Å. The Mn(1)-O(2) bond length is 1.93 Å. Both Mn(1)-O(1) bond lengths are 1.95 Å. Both Mn(1)-O(14) bond lengths are 1.91 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(10), one O(2), one O(3), one O(4), and one O(6) atom to form MnO6 octahedra that share  a cornercorner with one Na(6)O4 tetrahedra, corners with two equivalent Na(1)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. The Mn(2)-O(1) bond length is 2.01 Å. The Mn(2)-O(10) bond length is 2.03 Å. The Mn(2)-O(2) bond length is 1.99 Å. The Mn(2)-O(3) bond length is 1.91 Å. The Mn(2)-O(4) bond length is 1.97 Å. The Mn(2)-O(6) bond length is 1.92 Å. In the third Mn site, Mn(3) is bonded to one O(12), one O(9), two equivalent O(5), and two equivalent O(7) atoms to form MnO6 octahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra,  an edgeedge with one Mn(6)O6 octahedra, and edges with four equivalent Mn(5)O6 octahedra. The Mn(3)-O(12) bond length is 2.06 Å. The Mn(3)-O(9) bond length is 2.00 Å. Both Mn(3)-O(5) bond lengths are 1.98 Å. Both Mn(3)-O(7) bond lengths are 1.92 Å. In the fourth Mn site, Mn(4) is bonded to one O(10), one O(4), two equivalent O(1), and two equivalent O(6) atoms to form MnO6 octahedra that share  a cornercorner with one Na(6)O4 tetrahedra, corners with two equivalent Na(1)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, and edges with four equivalent Mn(2)O6 octahedra. The Mn(4)-O(10) bond length is 2.05 Å. The Mn(4)-O(4) bond length is 1.99 Å. Both Mn(4)-O(1) bond lengths are 1.99 Å. Both Mn(4)-O(6) bond lengths are 1.93 Å. In the fifth Mn site, Mn(5) is bonded to one O(11), one O(12), one O(5), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra,  an edgeedge with one Mn(6)O6 octahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Mn(5)O6 octahedra. The Mn(5)-O(11) bond length is 1.99 Å. The Mn(5)-O(12) bond length is 2.02 Å. The Mn(5)-O(5) bond length is 2.00 Å. The Mn(5)-O(7) bond length is 1.91 Å. The Mn(5)-O(8) bond length is 1.90 Å. The Mn(5)-O(9) bond length is 1.98 Å. In the sixth Mn site, Mn(6) is bonded to one O(11), one O(16), two equivalent O(15), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with three equivalent Na(3)O4 tetrahedra, corners with three equivalent Na(7)O4 tetrahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, edges with two equivalent Mn(5)O6 octahedra, and edges with two equivalent Mn(7)O6 octahedra. The Mn(6)-O(11) bond length is 1.98 Å. The Mn(6)-O(16) bond length is 1.98 Å. Both Mn(6)-O(15) bond lengths are 1.85 Å. Both Mn(6)-O(5) bond lengths are 2.01 Å. In the seventh Mn site, Mn(7) is bonded to one O(13), one O(14), one O(15), one O(16), one O(17), and one O(18) atom to form MnO6 octahedra that share  a cornercorner with one Na(3)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with two equivalent Na(7)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(6)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, and edges with two equivalent Mn(7)O6 octahedra. The Mn(7)-O(13) bond length is 1.89 Å. The Mn(7)-O(14) bond length is 1.89 Å. The Mn(7)-O(15) bond length is 1.93 Å. The Mn(7)-O(16) bond length is 2.02 Å. The Mn(7)-O(17) bond length is 1.92 Å. The Mn(7)-O(18) bond length is 1.97 Å. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(2), and one Mn(4) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1) and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded to one Na(1), one Na(2), and two equivalent Mn(2) atoms to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(12)NaMn3 tetrahedra, corners with two equivalent O(10)NaMn3 tetrahedra,  a cornercorner with one O(8)Na2Mn2 trigonal pyramid, corners with two equivalent O(6)Na2Mn2 trigonal pyramids, corners with two equivalent O(7)Na2Mn2 trigonal pyramids,  an edgeedge with one O(4)NaMn3 tetrahedra, and edges with two equivalent O(6)Na2Mn2 trigonal pyramids. In the fourth O site, O(4) is bonded to one Na(6), one Mn(4), and two equivalent Mn(2) atoms to form ONaMn3 tetrahedra that share corners with three equivalent O(10)NaMn3 tetrahedra,  a cornercorner with one O(18)NaMn3 trigonal pyramid, corners with two equivalent O(14)Na2Mn2 trigonal pyramids,  an edgeedge with one O(3)Na2Mn2 trigonal pyramid, and edges with two equivalent O(6)Na2Mn2 trigonal pyramids. In the fifth O site, O(5) is bonded to one Na(3), one Mn(3), one Mn(5), and one Mn(6) atom to form ONaMn3 tetrahedra that share  a cornercorner with one O(11)NaMn3 tetrahedra,  a cornercorner with one O(5)NaMn3 tetrahedra, corners with two equivalent O(9)NaMn3 tetrahedra,  a cornercorner with one O(13)Na2Mn2 trigonal pyramid,  a cornercorner with one O(8)Na2Mn2 trigonal pyramid, corners with two equivalent O(15)Na2Mn2 trigonal pyramids, corners with three equivalent O(7)Na2Mn2 trigonal pyramids,  an edgeedge with one O(11)NaMn3 tetrahedra,  an edgeedge with one O(12)NaMn3 tetrahedra, and  an edgeedge with one O(5)NaMn3 tetrahedra. In the sixth O site, O(6) is bonded to one Na(1), one Na(2), one Mn(2), and one Mn(4) atom to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(12)NaMn3 tetrahedra, corners with two equivalent O(10)NaMn3 tetrahedra,  a cornercorner with one O(3)Na2Mn2 trigonal pyramid,  a cornercorner with one O(6)Na2Mn2 trigonal pyramid,  a cornercorner with one O(8)Na2Mn2 trigonal pyramid, corners with two equivalent O(7)Na2Mn2 trigonal pyramids,  an edgeedge with one O(4)NaMn3 tetrahedra,  an edgeedge with one O(3)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(6)Na2Mn2 trigonal pyramid. In the seventh O site, O(7) is bonded to one Na(2), one Na(4), one Mn(3), and one Mn(5) atom to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(11)NaMn3 tetrahedra, corners with two equivalent O(12)NaMn3 tetrahedra, corners with three equivalent O(5)NaMn3 tetrahedra,  a cornercorner with one O(3)Na2Mn2 trigonal pyramid,  a cornercorner with one O(7)Na2Mn2 trigonal pyramid,  a cornercorner with one O(8)Na2Mn2 trigonal pyramid, corners with two equivalent O(6)Na2Mn2 trigonal pyramids,  an edgeedge with one O(9)NaMn3 tetrahedra,  an edgeedge with one O(7)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(8)Na2Mn2 trigonal pyramid. In the eighth O site, O(8) is bonded to one Na(2), one Na(4), and two equivalent Mn(5) atoms to form ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra, corners with two equivalent O(11)NaMn3 tetrahedra, corners with two equivalent O(12)NaMn3 tetrahedra, corners with two equivalent O(5)NaMn3 tetrahedra,  a cornercorner with one O(3)Na2Mn2 trigonal pyramid, corners with two equivalent O(6)Na2Mn2 trigonal pyramids, corners with two equivalent O(7)Na2Mn2 trigonal pyramids,  an edgeedge with one O(9)NaMn3 tetrahedra, and edges with two equivalent O(7)Na2Mn2 trigonal pyramids. In the ninth O site, O(9) is bonded to one Na(7), one Mn(3), and two equivalent Mn(5) atoms to form distorted ONaMn3 tetrahedra that share corners with two equivalent O(11)NaMn3 tetrahedra, corners with three equivalent O(12)NaMn3 tetrahedra, corners with four equivalent O(5)NaMn3 tetrahedra, corners with two equivalent O(15)Na2Mn2 trigonal pyramids,  an edgeedge with one O(8)Na2Mn2 trigonal pyramid, and edges with two equivalent O(7)Na2Mn2 trigonal pyramids. In the tenth O site, O(10) is bonded to one Na(4), one Mn(4), and two equivalent Mn(2) atoms to form distorted ONaMn3 tetrahedra that share corners with three equivalent O(4)NaMn3 tetrahedra,  a cornercorner with one O(8)Na2Mn2 trigonal pyramid, corners with two equivalent O(3)Na2Mn2 trigonal pyramids, corners with two equivalent O(7)Na2Mn2 trigonal pyramids, and corners with four equivalent O(6)Na2Mn2 trigonal pyramids. In the eleventh O site, O(11) is bonded to one Na(3), one Mn(6), and two equivalent Mn(5) atoms to form ONaMn3 tetrahedra that share corners with two equivalent O(5)NaMn3 tetrahedra, corners with two equivalent O(9)NaMn3 tetrahedra,  a cornercorner with one O(13)Na2Mn2 trigonal pyramid, corners with two equivalent O(15)Na2Mn2 trigonal pyramids, corners with two equivalent O(7)Na2Mn2 trigonal pyramids, corners with two equivalent O(8)Na2Mn2 trigonal pyramids,  an edgeedge with one O(12)NaMn3 tetrahedra, and edges with two equivalent O(5)NaMn3 tetrahedra. In the twelfth O site, O(12) is bonded to one Na(1), one Mn(3), and two equivalent Mn(5) atoms to form distorted ONaMn3 tetrahedra that share corners with three equivalent O(9)NaMn3 tetrahedra,  a cornercorner with one O(3)Na2Mn2 trigonal pyramid, corners with two equivalent O(6)Na2Mn2 trigonal pyramids, corners with two equivalent O(8)Na2Mn2 trigonal pyramids, corners with four equivalent O(7)Na2Mn2 trigonal pyramids,  an edgeedge with one O(11)NaMn3 tetrahedra, and edges with two equivalent O(5)NaMn3 tetrahedra. In the thirteenth O site, O(13) is bonded to one Na(3), one Na(5), and two equivalent Mn(7) atoms to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(11)NaMn3 tetrahedra, corners with two equivalent O(5)NaMn3 tetrahedra, corners with four equivalent O(15)Na2Mn2 trigonal pyramids,  an edgeedge with one O(18)NaMn3 trigonal pyramid, and edges with two equivalent O(14)Na2Mn2 trigonal pyramids. In the fourteenth O site, O(14) is bonded to one Na(5), one Na(6), one Mn(1), and one Mn(7) atom to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(4)NaMn3 tetrahedra,  a cornercorner with one O(14)Na2Mn2 trigonal pyramid,  a cornercorner with one O(18)NaMn3 trigonal pyramid, corners with three equivalent O(15)Na2Mn2 trigonal pyramids,  an edgeedge with one O(13)Na2Mn2 trigonal pyramid,  an edgeedge with one O(14)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(18)NaMn3 trigonal pyramid. In the fifteenth O site, O(15) is bonded to one Na(5), one Na(7), one Mn(6), and one Mn(7) atom to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(11)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra, corners with two equivalent O(5)NaMn3 tetrahedra,  a cornercorner with one O(15)Na2Mn2 trigonal pyramid,  a cornercorner with one O(18)NaMn3 trigonal pyramid, corners with two equivalent O(13)Na2Mn2 trigonal pyramids, corners with three equivalent O(14)Na2Mn2 trigonal pyramids, and  an edgeedge with one O(15)Na2Mn2 trigonal pyramid. In the sixteenth O site, O(16) is bonded in a distorted rectangular see-saw-like geometry to one Na(7), one Mn(6), and two equivalent Mn(7) atoms. In the seventeenth O site, O(17) is bonded in a distorted trigonal non-coplanar geometry to one Na(5) and two equivalent Mn(7) atoms. In the eighteenth O site, O(18) is bonded to one Na(6), one Mn(1), and two equivalent Mn(7) atoms to form distorted ONaMn3 trigonal pyramids that share  a cornercorner with one O(4)NaMn3 tetrahedra, corners with two equivalent O(14)Na2Mn2 trigonal pyramids, corners with two equivalent O(15)Na2Mn2 trigonal pyramids,  an edgeedge with one O(13)Na2Mn2 trigonal pyramid, and edges with two equivalent O(14)Na2Mn2 trigonal pyramids.