K7Na(TeO8)4 crystallizes in the orthorhombic Immm space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to four equivalent O(5) and four equivalent O(7) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to four equivalent O(5) and four equivalent O(6) atoms. In the third K site, K(3) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(6), and four equivalent O(7) atoms. In the fourth K site, K(4) is bonded in a 8-coordinate geometry to eight equivalent O(7) atoms. Na(1) is bonded to two equivalent O(2) and four equivalent O(6) atoms to form NaO6 octahedra that share corners with four equivalent Te(1)O5 trigonal bipyramids. Te(1) is bonded to one O(1), one O(2), one O(3), and two equivalent O(5) atoms to form distorted TeO5 trigonal bipyramids that share  a cornercorner with one Na(1)O6 octahedra and  an edgeedge with one Te(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 49°. There are seven inequivalent O sites. In the first O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent O(7) atoms. In the second O site, O(5) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Te(1) atom. In the third O site, O(6) is bonded in a 4-coordinate geometry to one K(3), two equivalent K(2), one Na(1), and one O(6) atom. In the fourth O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(3), one K(4), and one O(4) atom. In the fifth O site, O(1) is bonded in a water-like geometry to two equivalent Te(1) atoms. In the sixth O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(1) and two equivalent Te(1) atoms. In the seventh O site, O(3) is bonded in a single-bond geometry to one K(3) and one Te(1) atom.
K7Na(TeO8)4 crystallizes in the orthorhombic Immm space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to four equivalent O(5) and four equivalent O(7) atoms. All K(1)-O(5) bond lengths are 3.16 Å. All K(1)-O(7) bond lengths are 3.11 Å. In the second K site, K(2) is bonded in a 8-coordinate geometry to four equivalent O(5) and four equivalent O(6) atoms. All K(2)-O(5) bond lengths are 2.70 Å. All K(2)-O(6) bond lengths are 2.75 Å. In the third K site, K(3) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(6), and four equivalent O(7) atoms. Both K(3)-O(3) bond lengths are 3.38 Å. Both K(3)-O(6) bond lengths are 3.44 Å. All K(3)-O(7) bond lengths are 3.04 Å. In the fourth K site, K(4) is bonded in a 8-coordinate geometry to eight equivalent O(7) atoms. All K(4)-O(7) bond lengths are 2.83 Å. Na(1) is bonded to two equivalent O(2) and four equivalent O(6) atoms to form NaO6 octahedra that share corners with four equivalent Te(1)O5 trigonal bipyramids. Both Na(1)-O(2) bond lengths are 2.61 Å. All Na(1)-O(6) bond lengths are 2.30 Å. Te(1) is bonded to one O(1), one O(2), one O(3), and two equivalent O(5) atoms to form distorted TeO5 trigonal bipyramids that share  a cornercorner with one Na(1)O6 octahedra and  an edgeedge with one Te(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 49°. The Te(1)-O(1) bond length is 1.99 Å. The Te(1)-O(2) bond length is 2.11 Å. The Te(1)-O(3) bond length is 1.85 Å. Both Te(1)-O(5) bond lengths are 1.86 Å. There are seven inequivalent O sites. In the first O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent O(7) atoms. Both O(4)-O(7) bond lengths are 1.33 Å. In the second O site, O(5) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Te(1) atom. In the third O site, O(6) is bonded in a 4-coordinate geometry to one K(3), two equivalent K(2), one Na(1), and one O(6) atom. The O(6)-O(6) bond length is 1.30 Å. In the fourth O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(3), one K(4), and one O(4) atom. In the fifth O site, O(1) is bonded in a water-like geometry to two equivalent Te(1) atoms. In the sixth O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(1) and two equivalent Te(1) atoms. In the seventh O site, O(3) is bonded in a single-bond geometry to one K(3) and one Te(1) atom.