Bi10Te2O17I4 crystallizes in the orthorhombic Amm2 space group. There are seven inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to two equivalent O(5), two equivalent O(7), and four equivalent I(1) atoms. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to two equivalent O(6), two equivalent O(7), and four equivalent I(1) atoms. In the fourth Bi site, Bi(4) is bonded in a 4-coordinate geometry to two equivalent O(5), two equivalent O(8), and four equivalent I(1) atoms. In the fifth Bi site, Bi(5) is bonded in a 4-coordinate geometry to two equivalent O(6), two equivalent O(8), and four equivalent I(1) atoms. In the sixth Bi site, Bi(6) is bonded in a 4-coordinate geometry to two equivalent O(1), two equivalent O(4), and four equivalent I(1) atoms. In the seventh Bi site, Bi(7) is bonded in a 4-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent I(1) atoms. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a distorted trigonal pyramidal geometry to two equivalent O(1) and two equivalent O(3) atoms. In the second Te site, Te(2) is bonded in a distorted square pyramidal geometry to one O(9), two equivalent O(2), and two equivalent O(4) atoms. There are nine inequivalent O sites. In the first O site, O(1) is bonded to one Bi(6), two equivalent Bi(1), and one Te(1) atom to form distorted OBi3Te tetrahedra that share corners with two equivalent O(1)Bi3Te tetrahedra, corners with two equivalent O(6)Bi4 tetrahedra, corners with two equivalent O(7)Bi4 tetrahedra, corners with two equivalent O(8)Bi4 tetrahedra,  an edgeedge with one O(5)Bi4 tetrahedra, and edges with two equivalent O(3)Bi3Te tetrahedra. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Bi(7), two equivalent Bi(1), and one Te(2) atom. In the third O site, O(3) is bonded to one Bi(7), two equivalent Bi(1), and one Te(1) atom to form distorted OBi3Te tetrahedra that share corners with two equivalent O(3)Bi3Te tetrahedra, corners with two equivalent O(5)Bi4 tetrahedra, corners with two equivalent O(6)Bi4 tetrahedra, corners with two equivalent O(7)Bi4 tetrahedra,  an edgeedge with one O(8)Bi4 tetrahedra, and edges with two equivalent O(1)Bi3Te tetrahedra. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Bi(6), two equivalent Bi(1), and one Te(2) atom. In the fifth O site, O(5) is bonded to one Bi(2), one Bi(4), and two equivalent Bi(1) atoms to form OBi4 tetrahedra that share corners with two equivalent O(3)Bi3Te tetrahedra, corners with two equivalent O(5)Bi4 tetrahedra, corners with two equivalent O(6)Bi4 tetrahedra,  an edgeedge with one O(1)Bi3Te tetrahedra, edges with two equivalent O(7)Bi4 tetrahedra, and edges with two equivalent O(8)Bi4 tetrahedra. In the sixth O site, O(6) is bonded to one Bi(3), one Bi(5), and two equivalent Bi(1) atoms to form OBi4 tetrahedra that share corners with two equivalent O(1)Bi3Te tetrahedra, corners with two equivalent O(3)Bi3Te tetrahedra, corners with two equivalent O(5)Bi4 tetrahedra, corners with two equivalent O(6)Bi4 tetrahedra, edges with two equivalent O(7)Bi4 tetrahedra, and edges with two equivalent O(8)Bi4 tetrahedra. In the seventh O site, O(7) is bonded to one Bi(2), one Bi(3), and two equivalent Bi(1) atoms to form OBi4 tetrahedra that share corners with two equivalent O(1)Bi3Te tetrahedra, corners with two equivalent O(3)Bi3Te tetrahedra, corners with two equivalent O(7)Bi4 tetrahedra, corners with two equivalent O(8)Bi4 tetrahedra, edges with two equivalent O(5)Bi4 tetrahedra, and edges with two equivalent O(6)Bi4 tetrahedra. In the eighth O site, O(8) is bonded to one Bi(4), one Bi(5), and two equivalent Bi(1) atoms to form OBi4 tetrahedra that share corners with two equivalent O(1)Bi3Te tetrahedra, corners with two equivalent O(7)Bi4 tetrahedra, corners with two equivalent O(8)Bi4 tetrahedra,  an edgeedge with one O(3)Bi3Te tetrahedra, edges with two equivalent O(5)Bi4 tetrahedra, and edges with two equivalent O(6)Bi4 tetrahedra. In the ninth O site, O(9) is bonded in a single-bond geometry to four equivalent Bi(1) and one Te(2) atom. I(1) is bonded in a 6-coordinate geometry to one Bi(2), one Bi(3), one Bi(4), one Bi(5), one Bi(6), and one Bi(7) atom.
Bi10Te2O17I4 crystallizes in the orthorhombic Amm2 space group. There are seven inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The Bi(1)-O(1) bond length is 2.65 Å. The Bi(1)-O(2) bond length is 2.59 Å. The Bi(1)-O(3) bond length is 2.64 Å. The Bi(1)-O(4) bond length is 2.59 Å. The Bi(1)-O(5) bond length is 2.46 Å. The Bi(1)-O(6) bond length is 2.43 Å. The Bi(1)-O(7) bond length is 2.43 Å. The Bi(1)-O(8) bond length is 2.46 Å. The Bi(1)-O(9) bond length is 2.76 Å. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to two equivalent O(5), two equivalent O(7), and four equivalent I(1) atoms. Both Bi(2)-O(5) bond lengths are 2.33 Å. Both Bi(2)-O(7) bond lengths are 2.24 Å. All Bi(2)-I(1) bond lengths are 3.56 Å. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to two equivalent O(6), two equivalent O(7), and four equivalent I(1) atoms. Both Bi(3)-O(6) bond lengths are 2.29 Å. Both Bi(3)-O(7) bond lengths are 2.29 Å. All Bi(3)-I(1) bond lengths are 3.64 Å. In the fourth Bi site, Bi(4) is bonded in a 4-coordinate geometry to two equivalent O(5), two equivalent O(8), and four equivalent I(1) atoms. Both Bi(4)-O(5) bond lengths are 2.28 Å. Both Bi(4)-O(8) bond lengths are 2.28 Å. All Bi(4)-I(1) bond lengths are 3.65 Å. In the fifth Bi site, Bi(5) is bonded in a 4-coordinate geometry to two equivalent O(6), two equivalent O(8), and four equivalent I(1) atoms. Both Bi(5)-O(6) bond lengths are 2.24 Å. Both Bi(5)-O(8) bond lengths are 2.33 Å. All Bi(5)-I(1) bond lengths are 3.55 Å. In the sixth Bi site, Bi(6) is bonded in a 4-coordinate geometry to two equivalent O(1), two equivalent O(4), and four equivalent I(1) atoms. Both Bi(6)-O(1) bond lengths are 2.42 Å. Both Bi(6)-O(4) bond lengths are 2.21 Å. All Bi(6)-I(1) bond lengths are 3.65 Å. In the seventh Bi site, Bi(7) is bonded in a 4-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent I(1) atoms. Both Bi(7)-O(2) bond lengths are 2.21 Å. Both Bi(7)-O(3) bond lengths are 2.43 Å. All Bi(7)-I(1) bond lengths are 3.64 Å. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a distorted trigonal pyramidal geometry to two equivalent O(1) and two equivalent O(3) atoms. Both Te(1)-O(1) bond lengths are 2.04 Å. Both Te(1)-O(3) bond lengths are 2.04 Å. In the second Te site, Te(2) is bonded in a distorted square pyramidal geometry to one O(9), two equivalent O(2), and two equivalent O(4) atoms. The Te(2)-O(9) bond length is 1.89 Å. Both Te(2)-O(2) bond lengths are 2.15 Å. Both Te(2)-O(4) bond lengths are 2.15 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded to one Bi(6), two equivalent Bi(1), and one Te(1) atom to form distorted OBi3Te tetrahedra that share corners with two equivalent O(1)Bi3Te tetrahedra, corners with two equivalent O(6)Bi4 tetrahedra, corners with two equivalent O(7)Bi4 tetrahedra, corners with two equivalent O(8)Bi4 tetrahedra,  an edgeedge with one O(5)Bi4 tetrahedra, and edges with two equivalent O(3)Bi3Te tetrahedra. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Bi(7), two equivalent Bi(1), and one Te(2) atom. In the third O site, O(3) is bonded to one Bi(7), two equivalent Bi(1), and one Te(1) atom to form distorted OBi3Te tetrahedra that share corners with two equivalent O(3)Bi3Te tetrahedra, corners with two equivalent O(5)Bi4 tetrahedra, corners with two equivalent O(6)Bi4 tetrahedra, corners with two equivalent O(7)Bi4 tetrahedra,  an edgeedge with one O(8)Bi4 tetrahedra, and edges with two equivalent O(1)Bi3Te tetrahedra. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Bi(6), two equivalent Bi(1), and one Te(2) atom. In the fifth O site, O(5) is bonded to one Bi(2), one Bi(4), and two equivalent Bi(1) atoms to form OBi4 tetrahedra that share corners with two equivalent O(3)Bi3Te tetrahedra, corners with two equivalent O(5)Bi4 tetrahedra, corners with two equivalent O(6)Bi4 tetrahedra,  an edgeedge with one O(1)Bi3Te tetrahedra, edges with two equivalent O(7)Bi4 tetrahedra, and edges with two equivalent O(8)Bi4 tetrahedra. In the sixth O site, O(6) is bonded to one Bi(3), one Bi(5), and two equivalent Bi(1) atoms to form OBi4 tetrahedra that share corners with two equivalent O(1)Bi3Te tetrahedra, corners with two equivalent O(3)Bi3Te tetrahedra, corners with two equivalent O(5)Bi4 tetrahedra, corners with two equivalent O(6)Bi4 tetrahedra, edges with two equivalent O(7)Bi4 tetrahedra, and edges with two equivalent O(8)Bi4 tetrahedra. In the seventh O site, O(7) is bonded to one Bi(2), one Bi(3), and two equivalent Bi(1) atoms to form OBi4 tetrahedra that share corners with two equivalent O(1)Bi3Te tetrahedra, corners with two equivalent O(3)Bi3Te tetrahedra, corners with two equivalent O(7)Bi4 tetrahedra, corners with two equivalent O(8)Bi4 tetrahedra, edges with two equivalent O(5)Bi4 tetrahedra, and edges with two equivalent O(6)Bi4 tetrahedra. In the eighth O site, O(8) is bonded to one Bi(4), one Bi(5), and two equivalent Bi(1) atoms to form OBi4 tetrahedra that share corners with two equivalent O(1)Bi3Te tetrahedra, corners with two equivalent O(7)Bi4 tetrahedra, corners with two equivalent O(8)Bi4 tetrahedra,  an edgeedge with one O(3)Bi3Te tetrahedra, edges with two equivalent O(5)Bi4 tetrahedra, and edges with two equivalent O(6)Bi4 tetrahedra. In the ninth O site, O(9) is bonded in a single-bond geometry to four equivalent Bi(1) and one Te(2) atom. I(1) is bonded in a 6-coordinate geometry to one Bi(2), one Bi(3), one Bi(4), one Bi(5), one Bi(6), and one Bi(7) atom.