Ba2Zn2Tl2Sn3O10 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one O(6), one O(9), two equivalent O(8), and four equivalent O(7) atoms. In the second Ba site, Ba(2) is bonded in a 1-coordinate geometry to one O(4) and four equivalent O(2) atoms. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(10), one O(3), and one O(5) atom to form distorted ZnO4 trigonal pyramids that share corners with two equivalent Sn(1)O5 square pyramids and  an edgeedge with one Sn(1)O5 square pyramid. In the second Zn site, Zn(2) is bonded in a distorted T-shaped geometry to one O(10), one O(6), and one O(8) atom. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a distorted trigonal planar geometry to one O(4) and two equivalent O(9) atoms. In the second Tl site, Tl(2) is bonded in a water-like geometry to two equivalent O(4) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2), two equivalent O(1), and two equivalent O(3) atoms to form distorted SnO5 square pyramids that share corners with four equivalent Sn(1)O5 square pyramids, corners with two equivalent Zn(1)O4 trigonal pyramids, and  an edgeedge with one Zn(1)O4 trigonal pyramid. In the second Sn site, Sn(2) is bonded to one O(7), two equivalent O(6), and two equivalent O(8) atoms to form distorted corner-sharing SnO5 trigonal bipyramids. In the third Sn site, Sn(3) is bonded in a 4-coordinate geometry to two equivalent O(10) and two equivalent O(5) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Zn(1) and two equivalent Sn(1) atoms. In the second O site, O(2) is bonded to four equivalent Ba(2) and one Sn(1) atom to form distorted OBa4Sn square pyramids that share corners with four equivalent O(2)Ba4Sn square pyramids, corners with four equivalent O(4)BaTl3 tetrahedra, and edges with four equivalent O(2)Ba4Sn square pyramids. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Zn(1) and two equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded to one Ba(2), one Tl(1), and two equivalent Tl(2) atoms to form distorted OBaTl3 tetrahedra that share corners with four equivalent O(2)Ba4Sn square pyramids and corners with two equivalent O(4)BaTl3 tetrahedra. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Zn(1) and two equivalent Sn(3) atoms. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ba(1), one Zn(2), and two equivalent Sn(2) atoms. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to four equivalent Ba(1) and one Sn(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Zn(2), and two equivalent Sn(2) atoms. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ba(1) and two equivalent Tl(1) atoms. In the tenth O site, O(10) is bonded in a distorted see-saw-like geometry to one Zn(1), one Zn(2), and two equivalent Sn(3) atoms.
Ba2Zn2Tl2Sn3O10 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one O(6), one O(9), two equivalent O(8), and four equivalent O(7) atoms. The Ba(1)-O(6) bond length is 3.40 Å. The Ba(1)-O(9) bond length is 2.55 Å. There is one shorter (3.10 Å) and one longer (3.30 Å) Ba(1)-O(8) bond length. There are a spread of Ba(1)-O(7) bond distances ranging from 2.85-3.19 Å. In the second Ba site, Ba(2) is bonded in a 1-coordinate geometry to one O(4) and four equivalent O(2) atoms. The Ba(2)-O(4) bond length is 2.48 Å. There are a spread of Ba(2)-O(2) bond distances ranging from 2.95-3.06 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(10), one O(3), and one O(5) atom to form distorted ZnO4 trigonal pyramids that share corners with two equivalent Sn(1)O5 square pyramids and  an edgeedge with one Sn(1)O5 square pyramid. The Zn(1)-O(1) bond length is 2.11 Å. The Zn(1)-O(10) bond length is 2.17 Å. The Zn(1)-O(3) bond length is 2.00 Å. The Zn(1)-O(5) bond length is 1.94 Å. In the second Zn site, Zn(2) is bonded in a distorted T-shaped geometry to one O(10), one O(6), and one O(8) atom. The Zn(2)-O(10) bond length is 1.99 Å. The Zn(2)-O(6) bond length is 2.02 Å. The Zn(2)-O(8) bond length is 2.02 Å. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a distorted trigonal planar geometry to one O(4) and two equivalent O(9) atoms. The Tl(1)-O(4) bond length is 2.32 Å. There is one shorter (2.29 Å) and one longer (2.32 Å) Tl(1)-O(9) bond length. In the second Tl site, Tl(2) is bonded in a water-like geometry to two equivalent O(4) atoms. There is one shorter (2.57 Å) and one longer (2.65 Å) Tl(2)-O(4) bond length. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2), two equivalent O(1), and two equivalent O(3) atoms to form distorted SnO5 square pyramids that share corners with four equivalent Sn(1)O5 square pyramids, corners with two equivalent Zn(1)O4 trigonal pyramids, and  an edgeedge with one Zn(1)O4 trigonal pyramid. The Sn(1)-O(2) bond length is 2.02 Å. There is one shorter (2.12 Å) and one longer (2.29 Å) Sn(1)-O(1) bond length. There is one shorter (2.10 Å) and one longer (2.13 Å) Sn(1)-O(3) bond length. In the second Sn site, Sn(2) is bonded to one O(7), two equivalent O(6), and two equivalent O(8) atoms to form distorted corner-sharing SnO5 trigonal bipyramids. The Sn(2)-O(7) bond length is 1.99 Å. There is one shorter (2.09 Å) and one longer (2.16 Å) Sn(2)-O(6) bond length. There is one shorter (2.11 Å) and one longer (2.24 Å) Sn(2)-O(8) bond length. In the third Sn site, Sn(3) is bonded in a 4-coordinate geometry to two equivalent O(10) and two equivalent O(5) atoms. There is one shorter (2.14 Å) and one longer (2.38 Å) Sn(3)-O(10) bond length. There is one shorter (2.06 Å) and one longer (2.41 Å) Sn(3)-O(5) bond length. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Zn(1) and two equivalent Sn(1) atoms. In the second O site, O(2) is bonded to four equivalent Ba(2) and one Sn(1) atom to form distorted OBa4Sn square pyramids that share corners with four equivalent O(2)Ba4Sn square pyramids, corners with four equivalent O(4)BaTl3 tetrahedra, and edges with four equivalent O(2)Ba4Sn square pyramids. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Zn(1) and two equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded to one Ba(2), one Tl(1), and two equivalent Tl(2) atoms to form distorted OBaTl3 tetrahedra that share corners with four equivalent O(2)Ba4Sn square pyramids and corners with two equivalent O(4)BaTl3 tetrahedra. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Zn(1) and two equivalent Sn(3) atoms. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ba(1), one Zn(2), and two equivalent Sn(2) atoms. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to four equivalent Ba(1) and one Sn(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Zn(2), and two equivalent Sn(2) atoms. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ba(1) and two equivalent Tl(1) atoms. In the tenth O site, O(10) is bonded in a distorted see-saw-like geometry to one Zn(1), one Zn(2), and two equivalent Sn(3) atoms.