Na7Mn11O24 is Spinel-like structured and crystallizes in the triclinic P-1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. In the second Na site, Na(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form NaO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(4)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and corners with two equivalent Mn(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-70°. In the third Na site, Na(3) is bonded to one O(10), one O(3), one O(4), and one O(9) atom to form NaO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and corners with two equivalent Mn(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-69°. In the fourth Na site, Na(4) is bonded to one O(11), one O(12), one O(7), and one O(8) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, corners with two equivalent Mn(7)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra, and corners with three equivalent Mn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-75°. There are seven inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(2), one O(3), one O(7), and one O(8) atom to form MnO6 octahedra that share  a cornercorner with one Na(3)O4 tetrahedra, corners with two equivalent Na(2)O4 tetrahedra, corners with three equivalent Na(4)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra,  an edgeedge with one Mn(4)O6 octahedra,  an edgeedge with one Mn(6)O6 octahedra, and  an edgeedge with one Mn(7)O6 octahedra. In the second Mn site, Mn(2) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(8) atoms to form distorted MnO6 octahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra, corners with two equivalent Na(4)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. In the third Mn site, Mn(3) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(7) atoms to form MnO6 octahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra, corners with two equivalent Na(4)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. In the fourth Mn site, Mn(4) is bonded to one O(10), 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(2)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra, corners with three equivalent Na(4)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra,  an edgeedge with one Mn(5)O6 octahedra,  an edgeedge with one Mn(6)O6 octahedra, and  an edgeedge with one Mn(7)O6 octahedra. In the fifth Mn site, Mn(5) is bonded to two equivalent O(10), two equivalent O(6), and two equivalent O(9) atoms to form distorted MnO6 octahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with four equivalent Na(3)O4 tetrahedra, edges with two equivalent Mn(4)O6 octahedra, edges with two equivalent Mn(6)O6 octahedra, and edges with two equivalent Mn(7)O6 octahedra. In the sixth Mn site, Mn(6) is bonded to one O(10), one O(11), one O(12), one O(2), one O(4), and one O(6) atom to form MnO6 octahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra, corners with two equivalent Na(4)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(4)O6 octahedra,  an edgeedge with one 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(1), one O(11), one O(12), one O(4), one O(6), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra, corners with two equivalent Na(4)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(4)O6 octahedra,  an edgeedge with one Mn(5)O6 octahedra, and edges with two equivalent Mn(6)O6 octahedra. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Mn(1), and one Mn(7) atom to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(12)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(4)Na2Mn2 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(2)Na2Mn2 trigonal pyramids, corners with two equivalent O(6)NaMn3 trigonal pyramids,  an edgeedge with one O(2)Na2Mn2 trigonal pyramid,  an edgeedge with one O(4)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(11)NaMn3 trigonal pyramid. In the second O site, O(2) is bonded to one Na(1), one Na(2), one Mn(1), and one Mn(6) atom to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(12)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(4)Na2Mn2 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(1)Na2Mn2 trigonal pyramids, corners with two equivalent O(6)NaMn3 trigonal pyramids,  an edgeedge with one O(1)Na2Mn2 trigonal pyramid,  an edgeedge with one O(4)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(11)NaMn3 trigonal pyramid. In the third O site, O(3) is bonded to one Na(3), one Mn(1), one Mn(2), and one Mn(3) atom to form distorted ONaMn3 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(4)Na2Mn2 trigonal pyramid,  a cornercorner with one O(11)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(3)NaMn3 trigonal pyramids, corners with two equivalent O(5)NaMn3 trigonal pyramids,  an edgeedge with one O(7)NaMn3 tetrahedra,  an edgeedge with one O(5)NaMn3 trigonal pyramid, and  an edgeedge with one O(8)NaMn3 trigonal pyramid. In the fourth O site, O(4) is bonded to one Na(1), one Na(3), one Mn(6), and one Mn(7) atom to form distorted ONa2Mn2 trigonal pyramids that share corners with two equivalent O(10)NaMn3 tetrahedra, corners with two equivalent O(12)NaMn3 tetrahedra, corners with two equivalent O(9)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(4)Na2Mn2 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid, corners with two equivalent O(6)NaMn3 trigonal pyramids,  an edgeedge with one O(1)Na2Mn2 trigonal pyramid,  an edgeedge with one O(2)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(11)NaMn3 trigonal pyramid. In the fifth O site, O(5) is bonded to one Na(2), one Mn(2), one Mn(3), and one Mn(4) atom to form distorted ONaMn3 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(12)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(6)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(3)NaMn3 trigonal pyramids, corners with two equivalent O(5)NaMn3 trigonal pyramids,  an edgeedge with one O(7)NaMn3 tetrahedra,  an edgeedge with one O(3)NaMn3 trigonal pyramid, and  an edgeedge with one O(8)NaMn3 trigonal pyramid. In the sixth O site, O(6) is bonded to one Na(2), one Mn(5), one Mn(6), and one Mn(7) atom to form distorted ONaMn3 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(6)NaMn3 trigonal pyramid, corners with two equivalent O(1)Na2Mn2 trigonal pyramids, corners with two equivalent O(2)Na2Mn2 trigonal pyramids, corners with two equivalent O(4)Na2Mn2 trigonal pyramids, corners with two equivalent O(11)NaMn3 trigonal pyramids,  an edgeedge with one O(10)NaMn3 tetrahedra,  an edgeedge with one O(12)NaMn3 tetrahedra, and  an edgeedge with one O(9)NaMn3 tetrahedra. In the seventh O site, O(7) is bonded to one Na(4), one Mn(1), one Mn(3), and one Mn(4) atom to form ONaMn3 tetrahedra that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra, corners with two equivalent O(12)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(11)NaMn3 trigonal pyramids,  an edgeedge with one O(3)NaMn3 trigonal pyramid,  an edgeedge with one O(5)NaMn3 trigonal pyramid, and  an edgeedge with one O(8)NaMn3 trigonal pyramid. In the eighth O site, O(8) is bonded to one Na(4), one Mn(1), one Mn(2), and one Mn(4) atom to form ONaMn3 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra, corners with two equivalent O(12)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(11)NaMn3 trigonal pyramids,  an edgeedge with one O(7)NaMn3 tetrahedra,  an edgeedge with one O(3)NaMn3 trigonal pyramid, and  an edgeedge with one O(5)NaMn3 trigonal pyramid. In the ninth O site, O(9) is bonded to one Na(3), one Mn(4), one Mn(5), and one Mn(7) atom to form ONaMn3 tetrahedra that share  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra, corners with two equivalent O(10)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(11)NaMn3 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(6)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(4)Na2Mn2 trigonal pyramids,  an edgeedge with one O(10)NaMn3 tetrahedra,  an edgeedge with one O(12)NaMn3 tetrahedra, and  an edgeedge with one O(6)NaMn3 trigonal pyramid. In the tenth O site, O(10) is bonded to one Na(3), one Mn(4), one Mn(5), and one Mn(6) atom to form ONaMn3 tetrahedra that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra, corners with two equivalent O(9)NaMn3 tetrahedra,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(11)NaMn3 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(6)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(4)Na2Mn2 trigonal pyramids,  an edgeedge with one O(12)NaMn3 tetrahedra,  an edgeedge with one O(9)NaMn3 tetrahedra, and  an edgeedge with one O(6)NaMn3 trigonal pyramid. In the eleventh O site, O(11) is bonded to one Na(4), one Mn(1), one Mn(6), and one Mn(7) atom to form distorted ONaMn3 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra, corners with two equivalent O(7)NaMn3 tetrahedra, corners with three equivalent O(12)NaMn3 tetrahedra,  a cornercorner with one O(3)NaMn3 trigonal pyramid, corners with two equivalent O(6)NaMn3 trigonal pyramids, corners with two equivalent O(8)NaMn3 trigonal pyramids,  an edgeedge with one O(1)Na2Mn2 trigonal pyramid,  an edgeedge with one O(2)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(4)Na2Mn2 trigonal pyramid. In the twelfth O site, O(12) is bonded to one Na(4), one Mn(4), one Mn(6), and one Mn(7) atom to form ONaMn3 tetrahedra that share corners with two equivalent O(7)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid, corners with two equivalent O(4)Na2Mn2 trigonal pyramids, corners with two equivalent O(8)NaMn3 trigonal pyramids, corners with three equivalent O(11)NaMn3 trigonal pyramids,  an edgeedge with one O(10)NaMn3 tetrahedra,  an edgeedge with one O(9)NaMn3 tetrahedra, and  an edgeedge with one O(6)NaMn3 trigonal pyramid.
Na7Mn11O24 is Spinel-like structured and crystallizes in the triclinic P-1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. Both Na(1)-O(1) bond lengths are 2.42 Å. Both Na(1)-O(2) bond lengths are 2.45 Å. Both Na(1)-O(4) bond lengths are 2.32 Å. In the second Na site, Na(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form NaO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(4)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and corners with two equivalent Mn(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-70°. The Na(2)-O(1) bond length is 2.21 Å. The Na(2)-O(2) bond length is 2.20 Å. The Na(2)-O(5) bond length is 2.21 Å. The Na(2)-O(6) bond length is 2.23 Å. In the third Na site, Na(3) is bonded to one O(10), one O(3), one O(4), and one O(9) atom to form NaO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and corners with two equivalent Mn(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-69°. The Na(3)-O(10) bond length is 2.22 Å. The Na(3)-O(3) bond length is 2.23 Å. The Na(3)-O(4) bond length is 2.21 Å. The Na(3)-O(9) bond length is 2.20 Å. In the fourth Na site, Na(4) is bonded to one O(11), one O(12), one O(7), and one O(8) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, corners with two equivalent Mn(7)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra, and corners with three equivalent Mn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-75°. The Na(4)-O(11) bond length is 2.20 Å. The Na(4)-O(12) bond length is 2.13 Å. The Na(4)-O(7) bond length is 2.13 Å. The Na(4)-O(8) bond length is 2.14 Å. There are seven inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(2), one O(3), one O(7), and one O(8) atom to form MnO6 octahedra that share  a cornercorner with one Na(3)O4 tetrahedra, corners with two equivalent Na(2)O4 tetrahedra, corners with three equivalent Na(4)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra,  an edgeedge with one Mn(4)O6 octahedra,  an edgeedge with one Mn(6)O6 octahedra, and  an edgeedge with one Mn(7)O6 octahedra. The Mn(1)-O(1) bond length is 1.89 Å. The Mn(1)-O(11) bond length is 2.03 Å. The Mn(1)-O(2) bond length is 1.90 Å. The Mn(1)-O(3) bond length is 1.94 Å. The Mn(1)-O(7) bond length is 1.98 Å. The Mn(1)-O(8) bond length is 2.02 Å. In the second Mn site, Mn(2) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(8) atoms to form distorted MnO6 octahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra, corners with two equivalent Na(4)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. Both Mn(2)-O(3) bond lengths are 1.94 Å. Both Mn(2)-O(5) bond lengths are 2.26 Å. Both Mn(2)-O(8) bond lengths are 2.04 Å. In the third Mn site, Mn(3) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(7) atoms to form MnO6 octahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra, corners with two equivalent Na(4)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. Both Mn(3)-O(3) bond lengths are 2.22 Å. Both Mn(3)-O(5) bond lengths are 1.95 Å. Both Mn(3)-O(7) bond lengths are 2.05 Å. In the fourth Mn site, Mn(4) is bonded to one O(10), 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(2)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra, corners with three equivalent Na(4)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra,  an edgeedge with one Mn(5)O6 octahedra,  an edgeedge with one Mn(6)O6 octahedra, and  an edgeedge with one Mn(7)O6 octahedra. The Mn(4)-O(10) bond length is 1.98 Å. The Mn(4)-O(12) bond length is 1.95 Å. The Mn(4)-O(5) bond length is 1.94 Å. The Mn(4)-O(7) bond length is 1.94 Å. The Mn(4)-O(8) bond length is 1.93 Å. The Mn(4)-O(9) bond length is 1.98 Å. In the fifth Mn site, Mn(5) is bonded to two equivalent O(10), two equivalent O(6), and two equivalent O(9) atoms to form distorted MnO6 octahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with four equivalent Na(3)O4 tetrahedra, edges with two equivalent Mn(4)O6 octahedra, edges with two equivalent Mn(6)O6 octahedra, and edges with two equivalent Mn(7)O6 octahedra. Both Mn(5)-O(10) bond lengths are 1.99 Å. Both Mn(5)-O(6) bond lengths are 2.28 Å. Both Mn(5)-O(9) bond lengths are 2.00 Å. In the sixth Mn site, Mn(6) is bonded to one O(10), one O(11), one O(12), one O(2), one O(4), and one O(6) atom to form MnO6 octahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra, corners with two equivalent Na(4)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(4)O6 octahedra,  an edgeedge with one Mn(5)O6 octahedra, and edges with two equivalent Mn(7)O6 octahedra. The Mn(6)-O(10) bond length is 2.04 Å. The Mn(6)-O(11) bond length is 2.01 Å. The Mn(6)-O(12) bond length is 1.99 Å. The Mn(6)-O(2) bond length is 1.90 Å. The Mn(6)-O(4) bond length is 1.91 Å. The Mn(6)-O(6) bond length is 1.97 Å. In the seventh Mn site, Mn(7) is bonded to one O(1), one O(11), one O(12), one O(4), one O(6), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra, corners with two equivalent Na(4)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(4)O6 octahedra,  an edgeedge with one Mn(5)O6 octahedra, and edges with two equivalent Mn(6)O6 octahedra. The Mn(7)-O(1) bond length is 1.90 Å. The Mn(7)-O(11) bond length is 1.99 Å. The Mn(7)-O(12) bond length is 2.01 Å. The Mn(7)-O(4) bond length is 1.91 Å. The Mn(7)-O(6) bond length is 1.97 Å. The Mn(7)-O(9) bond length is 2.01 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Mn(1), and one Mn(7) atom to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(12)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(4)Na2Mn2 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(2)Na2Mn2 trigonal pyramids, corners with two equivalent O(6)NaMn3 trigonal pyramids,  an edgeedge with one O(2)Na2Mn2 trigonal pyramid,  an edgeedge with one O(4)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(11)NaMn3 trigonal pyramid. In the second O site, O(2) is bonded to one Na(1), one Na(2), one Mn(1), and one Mn(6) atom to form distorted ONa2Mn2 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(12)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(4)Na2Mn2 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(1)Na2Mn2 trigonal pyramids, corners with two equivalent O(6)NaMn3 trigonal pyramids,  an edgeedge with one O(1)Na2Mn2 trigonal pyramid,  an edgeedge with one O(4)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(11)NaMn3 trigonal pyramid. In the third O site, O(3) is bonded to one Na(3), one Mn(1), one Mn(2), and one Mn(3) atom to form distorted ONaMn3 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(4)Na2Mn2 trigonal pyramid,  a cornercorner with one O(11)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(3)NaMn3 trigonal pyramids, corners with two equivalent O(5)NaMn3 trigonal pyramids,  an edgeedge with one O(7)NaMn3 tetrahedra,  an edgeedge with one O(5)NaMn3 trigonal pyramid, and  an edgeedge with one O(8)NaMn3 trigonal pyramid. In the fourth O site, O(4) is bonded to one Na(1), one Na(3), one Mn(6), and one Mn(7) atom to form distorted ONa2Mn2 trigonal pyramids that share corners with two equivalent O(10)NaMn3 tetrahedra, corners with two equivalent O(12)NaMn3 tetrahedra, corners with two equivalent O(9)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(4)Na2Mn2 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid, corners with two equivalent O(6)NaMn3 trigonal pyramids,  an edgeedge with one O(1)Na2Mn2 trigonal pyramid,  an edgeedge with one O(2)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(11)NaMn3 trigonal pyramid. In the fifth O site, O(5) is bonded to one Na(2), one Mn(2), one Mn(3), and one Mn(4) atom to form distorted ONaMn3 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(12)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(6)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(3)NaMn3 trigonal pyramids, corners with two equivalent O(5)NaMn3 trigonal pyramids,  an edgeedge with one O(7)NaMn3 tetrahedra,  an edgeedge with one O(3)NaMn3 trigonal pyramid, and  an edgeedge with one O(8)NaMn3 trigonal pyramid. In the sixth O site, O(6) is bonded to one Na(2), one Mn(5), one Mn(6), and one Mn(7) atom to form distorted ONaMn3 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(6)NaMn3 trigonal pyramid, corners with two equivalent O(1)Na2Mn2 trigonal pyramids, corners with two equivalent O(2)Na2Mn2 trigonal pyramids, corners with two equivalent O(4)Na2Mn2 trigonal pyramids, corners with two equivalent O(11)NaMn3 trigonal pyramids,  an edgeedge with one O(10)NaMn3 tetrahedra,  an edgeedge with one O(12)NaMn3 tetrahedra, and  an edgeedge with one O(9)NaMn3 tetrahedra. In the seventh O site, O(7) is bonded to one Na(4), one Mn(1), one Mn(3), and one Mn(4) atom to form ONaMn3 tetrahedra that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra, corners with two equivalent O(12)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(11)NaMn3 trigonal pyramids,  an edgeedge with one O(3)NaMn3 trigonal pyramid,  an edgeedge with one O(5)NaMn3 trigonal pyramid, and  an edgeedge with one O(8)NaMn3 trigonal pyramid. In the eighth O site, O(8) is bonded to one Na(4), one Mn(1), one Mn(2), and one Mn(4) atom to form ONaMn3 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra, corners with two equivalent O(12)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(11)NaMn3 trigonal pyramids,  an edgeedge with one O(7)NaMn3 tetrahedra,  an edgeedge with one O(3)NaMn3 trigonal pyramid, and  an edgeedge with one O(5)NaMn3 trigonal pyramid. In the ninth O site, O(9) is bonded to one Na(3), one Mn(4), one Mn(5), and one Mn(7) atom to form ONaMn3 tetrahedra that share  a cornercorner with one O(7)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra, corners with two equivalent O(10)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(11)NaMn3 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(6)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(4)Na2Mn2 trigonal pyramids,  an edgeedge with one O(10)NaMn3 tetrahedra,  an edgeedge with one O(12)NaMn3 tetrahedra, and  an edgeedge with one O(6)NaMn3 trigonal pyramid. In the tenth O site, O(10) is bonded to one Na(3), one Mn(4), one Mn(5), and one Mn(6) atom to form ONaMn3 tetrahedra that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(7)NaMn3 tetrahedra, corners with two equivalent O(9)NaMn3 tetrahedra,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(11)NaMn3 trigonal pyramid,  a cornercorner with one O(3)NaMn3 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid,  a cornercorner with one O(6)NaMn3 trigonal pyramid,  a cornercorner with one O(8)NaMn3 trigonal pyramid, corners with two equivalent O(4)Na2Mn2 trigonal pyramids,  an edgeedge with one O(12)NaMn3 tetrahedra,  an edgeedge with one O(9)NaMn3 tetrahedra, and  an edgeedge with one O(6)NaMn3 trigonal pyramid. In the eleventh O site, O(11) is bonded to one Na(4), one Mn(1), one Mn(6), and one Mn(7) atom to form distorted ONaMn3 trigonal pyramids that share  a cornercorner with one O(10)NaMn3 tetrahedra,  a cornercorner with one O(9)NaMn3 tetrahedra, corners with two equivalent O(7)NaMn3 tetrahedra, corners with three equivalent O(12)NaMn3 tetrahedra,  a cornercorner with one O(3)NaMn3 trigonal pyramid, corners with two equivalent O(6)NaMn3 trigonal pyramids, corners with two equivalent O(8)NaMn3 trigonal pyramids,  an edgeedge with one O(1)Na2Mn2 trigonal pyramid,  an edgeedge with one O(2)Na2Mn2 trigonal pyramid, and  an edgeedge with one O(4)Na2Mn2 trigonal pyramid. In the twelfth O site, O(12) is bonded to one Na(4), one Mn(4), one Mn(6), and one Mn(7) atom to form ONaMn3 tetrahedra that share corners with two equivalent O(7)NaMn3 tetrahedra,  a cornercorner with one O(1)Na2Mn2 trigonal pyramid,  a cornercorner with one O(2)Na2Mn2 trigonal pyramid,  a cornercorner with one O(5)NaMn3 trigonal pyramid, corners with two equivalent O(4)Na2Mn2 trigonal pyramids, corners with two equivalent O(8)NaMn3 trigonal pyramids, corners with three equivalent O(11)NaMn3 trigonal pyramids,  an edgeedge with one O(10)NaMn3 tetrahedra,  an edgeedge with one O(9)NaMn3 tetrahedra, and  an edgeedge with one O(6)NaMn3 trigonal pyramid.