Na4Sn5O12 crystallizes in the triclinic P-1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(11), one O(5), one O(7), and two equivalent O(8) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(4)O6 octahedra,  a cornercorner with one Sn(3)O6 octahedra,  a cornercorner with one Sn(4)O6 octahedra,  a cornercorner with one Sn(5)O6 octahedra,  a cornercorner with one Sn(1)O4 tetrahedra,  a cornercorner with one Sn(2)O4 tetrahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Sn(4)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, and edges with three equivalent Sn(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-18°. In the second Na site, Na(2) is bonded to one O(10), one O(11), one O(12), one O(5), and two equivalent O(2) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(4)O6 octahedra,  a cornercorner with one Sn(3)O6 octahedra,  a cornercorner with one Sn(4)O6 octahedra,  a cornercorner with one Sn(5)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Sn(5)O6 octahedra, edges with two equivalent Sn(3)O6 octahedra, and edges with three equivalent Sn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-18°. In the third Na site, Na(3) is bonded to one O(10), one O(12), two equivalent O(3), and two equivalent O(4) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Sn(4)O6 octahedra,  a cornercorner with one Sn(5)O6 octahedra, corners with two equivalent Sn(1)O4 tetrahedra, corners with two equivalent Sn(2)O4 tetrahedra,  an edgeedge with one Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, and edges with three equivalent Sn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 15-16°. In the fourth Na site, Na(4) is bonded to one O(1), one O(11), one O(6), one O(7), one O(8), and one O(9) atom to form distorted NaO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra, corners with three equivalent Sn(1)O4 tetrahedra, corners with three equivalent Sn(2)O4 tetrahedra,  an edgeedge with one Sn(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, and edges with two equivalent Sn(5)O6 octahedra. The corner-sharing octahedral tilt angles are 18°. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(1), one O(3), one O(6), and one O(9) atom to form SnO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Sn(3)O6 octahedra,  a cornercorner with one Sn(4)O6 octahedra, corners with two equivalent Na(3)O6 octahedra, corners with three equivalent Na(4)O6 octahedra, and corners with two equivalent Sn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-68°. In the second Sn site, Sn(2) is bonded to one O(4), one O(6), one O(7), and one O(9) atom to form SnO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Sn(3)O6 octahedra,  a cornercorner with one Sn(5)O6 octahedra, corners with two equivalent Na(3)O6 octahedra, corners with three equivalent Na(4)O6 octahedra, and corners with two equivalent Sn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 54-67°. In the third Sn site, Sn(3) is bonded to one O(10), one O(12), one O(2), one O(3), one O(4), and one O(5) atom to form SnO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Sn(1)O4 tetrahedra,  a cornercorner with one Sn(2)O4 tetrahedra,  an edgeedge with one Sn(5)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Sn(4)O6 octahedra, and edges with three equivalent Na(3)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. In the fourth Sn site, Sn(4) is bonded to one O(1), one O(10), one O(11), one O(5), and two equivalent O(2) atoms to form SnO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(3)O6 octahedra,  a cornercorner with one Sn(1)O4 tetrahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Sn(4)O6 octahedra,  an edgeedge with one Sn(5)O6 octahedra, edges with two equivalent Sn(3)O6 octahedra, and edges with three equivalent Na(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-16°. In the fifth Sn site, Sn(5) is bonded to one O(11), one O(12), one O(5), one O(7), and two equivalent O(8) atoms to form SnO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(3)O6 octahedra,  a cornercorner with one Sn(2)O4 tetrahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Sn(3)O6 octahedra,  an edgeedge with one Sn(4)O6 octahedra,  an edgeedge with one Sn(5)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, and edges with three equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-15°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(4), one Sn(1), and one Sn(4) atom to form distorted ONa2Sn2 trigonal pyramids that share  a cornercorner with one O(11)Na3Sn2 square pyramid,  a cornercorner with one O(8)Na3Sn2 square pyramid, corners with two equivalent O(2)Na2Sn3 square pyramids, corners with two equivalent O(7)Na2Sn2 tetrahedra,  an edgeedge with one O(5)Na2Sn3 square pyramid,  an edgeedge with one O(11)Na3Sn2 square pyramid, and  an edgeedge with one O(8)Na3Sn2 square pyramid. In the second O site, O(2) is bonded to two equivalent Na(2), one Sn(3), and two equivalent Sn(4) atoms to form ONa2Sn3 square pyramids that share  a cornercorner with one O(5)Na2Sn3 square pyramid, corners with two equivalent O(11)Na3Sn2 square pyramids,  a cornercorner with one O(4)Na2Sn2 tetrahedra, corners with two equivalent O(1)Na2Sn2 trigonal pyramids,  an edgeedge with one O(11)Na3Sn2 square pyramid, edges with two equivalent O(2)Na2Sn3 square pyramids, and edges with two equivalent O(5)Na2Sn3 square pyramids. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(3), one Sn(1), and one Sn(3) atom. In the fourth O site, O(4) is bonded to two equivalent Na(3), one Sn(2), and one Sn(3) atom to form distorted ONa2Sn2 tetrahedra that share  a cornercorner with one O(2)Na2Sn3 square pyramid,  a cornercorner with one O(5)Na2Sn3 square pyramid,  a cornercorner with one O(7)Na2Sn2 tetrahedra, and  an edgeedge with one O(4)Na2Sn2 tetrahedra. In the fifth O site, O(5) is bonded to one Na(1), one Na(2), one Sn(3), one Sn(4), and one Sn(5) atom to form ONa2Sn3 square pyramids that share  a cornercorner with one O(2)Na2Sn3 square pyramid, corners with two equivalent O(8)Na3Sn2 square pyramids,  a cornercorner with one O(4)Na2Sn2 tetrahedra, corners with two equivalent O(7)Na2Sn2 tetrahedra,  an edgeedge with one O(8)Na3Sn2 square pyramid, edges with two equivalent O(2)Na2Sn3 square pyramids, edges with two equivalent O(11)Na3Sn2 square pyramids, and  an edgeedge with one O(1)Na2Sn2 trigonal pyramid. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Na(4), one Sn(1), and one Sn(2) atom. In the seventh O site, O(7) is bonded to one Na(1), one Na(4), one Sn(2), and one Sn(5) atom to form distorted ONa2Sn2 tetrahedra that share  a cornercorner with one O(11)Na3Sn2 square pyramid,  a cornercorner with one O(8)Na3Sn2 square pyramid, corners with two equivalent O(5)Na2Sn3 square pyramids,  a cornercorner with one O(4)Na2Sn2 tetrahedra, corners with two equivalent O(1)Na2Sn2 trigonal pyramids,  an edgeedge with one O(11)Na3Sn2 square pyramid, and edges with two equivalent O(8)Na3Sn2 square pyramids. In the eighth O site, O(8) is bonded to one Na(4), two equivalent Na(1), and two equivalent Sn(5) atoms to form ONa3Sn2 square pyramids that share  a cornercorner with one O(11)Na3Sn2 square pyramid, corners with two equivalent O(5)Na2Sn3 square pyramids,  a cornercorner with one O(7)Na2Sn2 tetrahedra,  a cornercorner with one O(1)Na2Sn2 trigonal pyramid,  an edgeedge with one O(5)Na2Sn3 square pyramid, edges with two equivalent O(11)Na3Sn2 square pyramids, edges with two equivalent O(8)Na3Sn2 square pyramids, edges with two equivalent O(7)Na2Sn2 tetrahedra, and  an edgeedge with one O(1)Na2Sn2 trigonal pyramid. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Na(4), one Sn(1), and one Sn(2) atom. In the tenth O site, O(10) is bonded in a see-saw-like geometry to one Na(2), one Na(3), one Sn(3), and one Sn(4) atom. In the eleventh O site, O(11) is bonded to one Na(1), one Na(2), one Na(4), one Sn(4), and one Sn(5) atom to form ONa3Sn2 square pyramids that share  a cornercorner with one O(8)Na3Sn2 square pyramid, corners with two equivalent O(2)Na2Sn3 square pyramids,  a cornercorner with one O(7)Na2Sn2 tetrahedra,  a cornercorner with one O(1)Na2Sn2 trigonal pyramid,  an edgeedge with one O(2)Na2Sn3 square pyramid, edges with two equivalent O(5)Na2Sn3 square pyramids, edges with two equivalent O(8)Na3Sn2 square pyramids,  an edgeedge with one O(7)Na2Sn2 tetrahedra, and  an edgeedge with one O(1)Na2Sn2 trigonal pyramid. In the twelfth O site, O(12) is bonded in a distorted see-saw-like geometry to one Na(2), one Na(3), one Sn(3), and one Sn(5) atom.
Na4Sn5O12 crystallizes in the triclinic P-1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(11), one O(5), one O(7), and two equivalent O(8) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(4)O6 octahedra,  a cornercorner with one Sn(3)O6 octahedra,  a cornercorner with one Sn(4)O6 octahedra,  a cornercorner with one Sn(5)O6 octahedra,  a cornercorner with one Sn(1)O4 tetrahedra,  a cornercorner with one Sn(2)O4 tetrahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Sn(4)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, and edges with three equivalent Sn(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-18°. The Na(1)-O(1) bond length is 2.33 Å. The Na(1)-O(11) bond length is 2.61 Å. The Na(1)-O(5) bond length is 2.48 Å. The Na(1)-O(7) bond length is 2.32 Å. There is one shorter (2.39 Å) and one longer (2.48 Å) Na(1)-O(8) bond length. In the second Na site, Na(2) is bonded to one O(10), one O(11), one O(12), one O(5), and two equivalent O(2) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(4)O6 octahedra,  a cornercorner with one Sn(3)O6 octahedra,  a cornercorner with one Sn(4)O6 octahedra,  a cornercorner with one Sn(5)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Sn(5)O6 octahedra, edges with two equivalent Sn(3)O6 octahedra, and edges with three equivalent Sn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-18°. The Na(2)-O(10) bond length is 2.38 Å. The Na(2)-O(11) bond length is 2.37 Å. The Na(2)-O(12) bond length is 2.39 Å. The Na(2)-O(5) bond length is 2.47 Å. There is one shorter (2.44 Å) and one longer (2.59 Å) Na(2)-O(2) bond length. In the third Na site, Na(3) is bonded to one O(10), one O(12), two equivalent O(3), and two equivalent O(4) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Sn(4)O6 octahedra,  a cornercorner with one Sn(5)O6 octahedra, corners with two equivalent Sn(1)O4 tetrahedra, corners with two equivalent Sn(2)O4 tetrahedra,  an edgeedge with one Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, and edges with three equivalent Sn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 15-16°. The Na(3)-O(10) bond length is 2.45 Å. The Na(3)-O(12) bond length is 2.50 Å. There is one shorter (2.30 Å) and one longer (2.40 Å) Na(3)-O(3) bond length. There is one shorter (2.30 Å) and one longer (2.42 Å) Na(3)-O(4) bond length. In the fourth Na site, Na(4) is bonded to one O(1), one O(11), one O(6), one O(7), one O(8), and one O(9) atom to form distorted NaO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra, corners with three equivalent Sn(1)O4 tetrahedra, corners with three equivalent Sn(2)O4 tetrahedra,  an edgeedge with one Sn(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, and edges with two equivalent Sn(5)O6 octahedra. The corner-sharing octahedral tilt angles are 18°. The Na(4)-O(1) bond length is 2.39 Å. The Na(4)-O(11) bond length is 2.50 Å. The Na(4)-O(6) bond length is 2.53 Å. The Na(4)-O(7) bond length is 2.37 Å. The Na(4)-O(8) bond length is 2.55 Å. The Na(4)-O(9) bond length is 2.55 Å. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(1), one O(3), one O(6), and one O(9) atom to form SnO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Sn(3)O6 octahedra,  a cornercorner with one Sn(4)O6 octahedra, corners with two equivalent Na(3)O6 octahedra, corners with three equivalent Na(4)O6 octahedra, and corners with two equivalent Sn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-68°. The Sn(1)-O(1) bond length is 1.97 Å. The Sn(1)-O(3) bond length is 1.96 Å. The Sn(1)-O(6) bond length is 2.02 Å. The Sn(1)-O(9) bond length is 2.00 Å. In the second Sn site, Sn(2) is bonded to one O(4), one O(6), one O(7), and one O(9) atom to form SnO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Sn(3)O6 octahedra,  a cornercorner with one Sn(5)O6 octahedra, corners with two equivalent Na(3)O6 octahedra, corners with three equivalent Na(4)O6 octahedra, and corners with two equivalent Sn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 54-67°. The Sn(2)-O(4) bond length is 1.96 Å. The Sn(2)-O(6) bond length is 2.00 Å. The Sn(2)-O(7) bond length is 1.96 Å. The Sn(2)-O(9) bond length is 2.03 Å. In the third Sn site, Sn(3) is bonded to one O(10), one O(12), one O(2), one O(3), one O(4), and one O(5) atom to form SnO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Sn(1)O4 tetrahedra,  a cornercorner with one Sn(2)O4 tetrahedra,  an edgeedge with one Sn(5)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Sn(4)O6 octahedra, and edges with three equivalent Na(3)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. The Sn(3)-O(10) bond length is 2.07 Å. The Sn(3)-O(12) bond length is 2.05 Å. The Sn(3)-O(2) bond length is 2.18 Å. The Sn(3)-O(3) bond length is 2.09 Å. The Sn(3)-O(4) bond length is 2.09 Å. The Sn(3)-O(5) bond length is 2.20 Å. In the fourth Sn site, Sn(4) is bonded to one O(1), one O(10), one O(11), one O(5), and two equivalent O(2) atoms to form SnO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(3)O6 octahedra,  a cornercorner with one Sn(1)O4 tetrahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Sn(4)O6 octahedra,  an edgeedge with one Sn(5)O6 octahedra, edges with two equivalent Sn(3)O6 octahedra, and edges with three equivalent Na(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-16°. The Sn(4)-O(1) bond length is 2.11 Å. The Sn(4)-O(10) bond length is 2.05 Å. The Sn(4)-O(11) bond length is 2.06 Å. The Sn(4)-O(5) bond length is 2.16 Å. There is one shorter (2.18 Å) and one longer (2.21 Å) Sn(4)-O(2) bond length. In the fifth Sn site, Sn(5) is bonded to one O(11), one O(12), one O(5), one O(7), and two equivalent O(8) atoms to form SnO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(3)O6 octahedra,  a cornercorner with one Sn(2)O4 tetrahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Sn(3)O6 octahedra,  an edgeedge with one Sn(4)O6 octahedra,  an edgeedge with one Sn(5)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, and edges with three equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-15°. The Sn(5)-O(11) bond length is 2.13 Å. The Sn(5)-O(12) bond length is 2.09 Å. The Sn(5)-O(5) bond length is 2.23 Å. The Sn(5)-O(7) bond length is 2.16 Å. There is one shorter (2.08 Å) and one longer (2.11 Å) Sn(5)-O(8) bond length. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(4), one Sn(1), and one Sn(4) atom to form distorted ONa2Sn2 trigonal pyramids that share  a cornercorner with one O(11)Na3Sn2 square pyramid,  a cornercorner with one O(8)Na3Sn2 square pyramid, corners with two equivalent O(2)Na2Sn3 square pyramids, corners with two equivalent O(7)Na2Sn2 tetrahedra,  an edgeedge with one O(5)Na2Sn3 square pyramid,  an edgeedge with one O(11)Na3Sn2 square pyramid, and  an edgeedge with one O(8)Na3Sn2 square pyramid. In the second O site, O(2) is bonded to two equivalent Na(2), one Sn(3), and two equivalent Sn(4) atoms to form ONa2Sn3 square pyramids that share  a cornercorner with one O(5)Na2Sn3 square pyramid, corners with two equivalent O(11)Na3Sn2 square pyramids,  a cornercorner with one O(4)Na2Sn2 tetrahedra, corners with two equivalent O(1)Na2Sn2 trigonal pyramids,  an edgeedge with one O(11)Na3Sn2 square pyramid, edges with two equivalent O(2)Na2Sn3 square pyramids, and edges with two equivalent O(5)Na2Sn3 square pyramids. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(3), one Sn(1), and one Sn(3) atom. In the fourth O site, O(4) is bonded to two equivalent Na(3), one Sn(2), and one Sn(3) atom to form distorted ONa2Sn2 tetrahedra that share  a cornercorner with one O(2)Na2Sn3 square pyramid,  a cornercorner with one O(5)Na2Sn3 square pyramid,  a cornercorner with one O(7)Na2Sn2 tetrahedra, and  an edgeedge with one O(4)Na2Sn2 tetrahedra. In the fifth O site, O(5) is bonded to one Na(1), one Na(2), one Sn(3), one Sn(4), and one Sn(5) atom to form ONa2Sn3 square pyramids that share  a cornercorner with one O(2)Na2Sn3 square pyramid, corners with two equivalent O(8)Na3Sn2 square pyramids,  a cornercorner with one O(4)Na2Sn2 tetrahedra, corners with two equivalent O(7)Na2Sn2 tetrahedra,  an edgeedge with one O(8)Na3Sn2 square pyramid, edges with two equivalent O(2)Na2Sn3 square pyramids, edges with two equivalent O(11)Na3Sn2 square pyramids, and  an edgeedge with one O(1)Na2Sn2 trigonal pyramid. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Na(4), one Sn(1), and one Sn(2) atom. In the seventh O site, O(7) is bonded to one Na(1), one Na(4), one Sn(2), and one Sn(5) atom to form distorted ONa2Sn2 tetrahedra that share  a cornercorner with one O(11)Na3Sn2 square pyramid,  a cornercorner with one O(8)Na3Sn2 square pyramid, corners with two equivalent O(5)Na2Sn3 square pyramids,  a cornercorner with one O(4)Na2Sn2 tetrahedra, corners with two equivalent O(1)Na2Sn2 trigonal pyramids,  an edgeedge with one O(11)Na3Sn2 square pyramid, and edges with two equivalent O(8)Na3Sn2 square pyramids. In the eighth O site, O(8) is bonded to one Na(4), two equivalent Na(1), and two equivalent Sn(5) atoms to form ONa3Sn2 square pyramids that share  a cornercorner with one O(11)Na3Sn2 square pyramid, corners with two equivalent O(5)Na2Sn3 square pyramids,  a cornercorner with one O(7)Na2Sn2 tetrahedra,  a cornercorner with one O(1)Na2Sn2 trigonal pyramid,  an edgeedge with one O(5)Na2Sn3 square pyramid, edges with two equivalent O(11)Na3Sn2 square pyramids, edges with two equivalent O(8)Na3Sn2 square pyramids, edges with two equivalent O(7)Na2Sn2 tetrahedra, and  an edgeedge with one O(1)Na2Sn2 trigonal pyramid. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Na(4), one Sn(1), and one Sn(2) atom. In the tenth O site, O(10) is bonded in a see-saw-like geometry to one Na(2), one Na(3), one Sn(3), and one Sn(4) atom. In the eleventh O site, O(11) is bonded to one Na(1), one Na(2), one Na(4), one Sn(4), and one Sn(5) atom to form ONa3Sn2 square pyramids that share  a cornercorner with one O(8)Na3Sn2 square pyramid, corners with two equivalent O(2)Na2Sn3 square pyramids,  a cornercorner with one O(7)Na2Sn2 tetrahedra,  a cornercorner with one O(1)Na2Sn2 trigonal pyramid,  an edgeedge with one O(2)Na2Sn3 square pyramid, edges with two equivalent O(5)Na2Sn3 square pyramids, edges with two equivalent O(8)Na3Sn2 square pyramids,  an edgeedge with one O(7)Na2Sn2 tetrahedra, and  an edgeedge with one O(1)Na2Sn2 trigonal pyramid. In the twelfth O site, O(12) is bonded in a distorted see-saw-like geometry to one Na(2), one Na(3), one Sn(3), and one Sn(5) atom.