Na2WTe4O12 crystallizes in the monoclinic C2/c space group. Na(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. W(1) is bonded to two equivalent O(1), two equivalent O(5), and two equivalent O(6) atoms to form distorted WO6 octahedra that share corners with two equivalent Te(2)O5 square pyramids. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a distorted see-saw-like geometry to one O(3), one O(4), one O(5), and one O(6) atom. In the second Te site, Te(2) is bonded to one O(1), one O(3), one O(4), and two equivalent O(2) atoms to form distorted TeO5 square pyramids that share  a cornercorner with one W(1)O6 octahedra and  an edgeedge with one Te(2)O5 square pyramid. The corner-sharing octahedral tilt angles are 52°. There are six inequivalent O sites. In the first O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Na(1) and two equivalent Te(2) atoms. In the second O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Te(1), and one Te(2) atom. In the third O site, O(4) is bonded to two equivalent Na(1), one Te(1), and one Te(2) atom to form distorted corner-sharing ONa2Te2 trigonal pyramids. In the fourth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one W(1) and one Te(1) atom. In the fifth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one W(1) and one Te(1) atom. In the sixth O site, O(1) is bonded in a trigonal planar geometry to one Na(1), one W(1), and one Te(2) atom.
Na2WTe4O12 crystallizes in the monoclinic C2/c space group. Na(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The Na(1)-O(1) bond length is 2.34 Å. There is one shorter (2.59 Å) and one longer (2.74 Å) Na(1)-O(2) bond length. There is one shorter (2.61 Å) and one longer (2.70 Å) Na(1)-O(3) bond length. There is one shorter (2.41 Å) and one longer (2.44 Å) Na(1)-O(4) bond length. W(1) is bonded to two equivalent O(1), two equivalent O(5), and two equivalent O(6) atoms to form distorted WO6 octahedra that share corners with two equivalent Te(2)O5 square pyramids. Both W(1)-O(1) bond lengths are 1.98 Å. Both W(1)-O(5) bond lengths are 2.14 Å. Both W(1)-O(6) bond lengths are 1.82 Å. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a distorted see-saw-like geometry to one O(3), one O(4), one O(5), and one O(6) atom. The Te(1)-O(3) bond length is 2.00 Å. The Te(1)-O(4) bond length is 1.90 Å. The Te(1)-O(5) bond length is 1.88 Å. The Te(1)-O(6) bond length is 2.56 Å. In the second Te site, Te(2) is bonded to one O(1), one O(3), one O(4), and two equivalent O(2) atoms to form distorted TeO5 square pyramids that share  a cornercorner with one W(1)O6 octahedra and  an edgeedge with one Te(2)O5 square pyramid. The corner-sharing octahedral tilt angles are 52°. The Te(2)-O(1) bond length is 2.02 Å. The Te(2)-O(3) bond length is 2.06 Å. The Te(2)-O(4) bond length is 2.34 Å. There is one shorter (1.90 Å) and one longer (2.37 Å) Te(2)-O(2) bond length. There are six inequivalent O sites. In the first O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Na(1) and two equivalent Te(2) atoms. In the second O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Te(1), and one Te(2) atom. In the third O site, O(4) is bonded to two equivalent Na(1), one Te(1), and one Te(2) atom to form distorted corner-sharing ONa2Te2 trigonal pyramids. In the fourth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one W(1) and one Te(1) atom. In the fifth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one W(1) and one Te(1) atom. In the sixth O site, O(1) is bonded in a trigonal planar geometry to one Na(1), one W(1), and one Te(2) atom.