MgZn2(BiO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(12), one O(2), one O(4), one O(5), and one O(7) atom. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 5-coordinate geometry to one O(1), one O(11), one O(3), one O(8), and one O(9) atom. In the second Zn site, Zn(2) is bonded to one O(10), one O(12), one O(2), and one O(6) atom to form distorted ZnO4 trigonal pyramids that share  a cornercorner with one Bi(1)O6 octahedra,  a cornercorner with one Bi(2)O6 octahedra,  a cornercorner with one Bi(3)O6 octahedra,  a cornercorner with one Bi(4)O6 octahedra,  an edgeedge with one Bi(3)O6 octahedra, and  an edgeedge with one Bi(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 60-77°. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(10), one O(11), one O(3), one O(4), one O(7), and one O(8) atom to form BiO6 octahedra that share corners with two equivalent Bi(4)O6 octahedra, corners with four equivalent Bi(2)O6 octahedra, and  a cornercorner with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 44-53°. In the second Bi site, Bi(2) is bonded to one O(12), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form BiO6 octahedra that share corners with two equivalent Bi(3)O6 octahedra, corners with four equivalent Bi(1)O6 octahedra, and  a cornercorner with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 44-52°. In the third Bi site, Bi(3) is bonded to one O(1), one O(12), one O(2), one O(5), one O(6), and one O(9) atom to form distorted BiO6 octahedra that share corners with two equivalent Bi(2)O6 octahedra, corners with four equivalent Bi(4)O6 octahedra,  a cornercorner with one Zn(2)O4 trigonal pyramid, and  an edgeedge with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 45-60°. In the fourth Bi site, Bi(4) is bonded to one O(1), one O(10), one O(11), one O(2), one O(5), and one O(6) atom to form distorted BiO6 octahedra that share corners with two equivalent Bi(1)O6 octahedra, corners with four equivalent Bi(3)O6 octahedra,  a cornercorner with one Zn(2)O4 trigonal pyramid, and  an edgeedge with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 45-60°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one Zn(1), one Bi(3), and one Bi(4) atom. In the second O site, O(2) is bonded in a distorted trigonal pyramidal geometry to one Mg(1), one Zn(2), one Bi(3), and one Bi(4) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one Zn(1), one Bi(1), and one Bi(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Mg(1), one Bi(1), and one Bi(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one Bi(3), and one Bi(4) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Zn(2), one Bi(3), and one Bi(4) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mg(1), one Bi(1), and one Bi(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Zn(1), one Bi(1), and one Bi(2) atom. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one Zn(1), one Bi(2), and one Bi(3) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Mg(1), one Zn(2), one Bi(1), and one Bi(4) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one Bi(1), and one Bi(4) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Mg(1), one Zn(2), one Bi(2), and one Bi(3) atom.
MgZn2(BiO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(12), one O(2), one O(4), one O(5), and one O(7) atom. The Mg(1)-O(1) bond length is 2.72 Å. The Mg(1)-O(10) bond length is 2.16 Å. The Mg(1)-O(12) bond length is 2.21 Å. The Mg(1)-O(2) bond length is 2.54 Å. The Mg(1)-O(4) bond length is 2.17 Å. The Mg(1)-O(5) bond length is 2.06 Å. The Mg(1)-O(7) bond length is 2.46 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 5-coordinate geometry to one O(1), one O(11), one O(3), one O(8), and one O(9) atom. The Zn(1)-O(1) bond length is 2.02 Å. The Zn(1)-O(11) bond length is 2.10 Å. The Zn(1)-O(3) bond length is 2.21 Å. The Zn(1)-O(8) bond length is 2.08 Å. The Zn(1)-O(9) bond length is 2.06 Å. In the second Zn site, Zn(2) is bonded to one O(10), one O(12), one O(2), and one O(6) atom to form distorted ZnO4 trigonal pyramids that share  a cornercorner with one Bi(1)O6 octahedra,  a cornercorner with one Bi(2)O6 octahedra,  a cornercorner with one Bi(3)O6 octahedra,  a cornercorner with one Bi(4)O6 octahedra,  an edgeedge with one Bi(3)O6 octahedra, and  an edgeedge with one Bi(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 60-77°. The Zn(2)-O(10) bond length is 2.03 Å. The Zn(2)-O(12) bond length is 2.17 Å. The Zn(2)-O(2) bond length is 2.02 Å. The Zn(2)-O(6) bond length is 2.07 Å. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(10), one O(11), one O(3), one O(4), one O(7), and one O(8) atom to form BiO6 octahedra that share corners with two equivalent Bi(4)O6 octahedra, corners with four equivalent Bi(2)O6 octahedra, and  a cornercorner with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 44-53°. The Bi(1)-O(10) bond length is 2.14 Å. The Bi(1)-O(11) bond length is 2.11 Å. The Bi(1)-O(3) bond length is 2.19 Å. The Bi(1)-O(4) bond length is 2.18 Å. The Bi(1)-O(7) bond length is 2.17 Å. The Bi(1)-O(8) bond length is 2.17 Å. In the second Bi site, Bi(2) is bonded to one O(12), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form BiO6 octahedra that share corners with two equivalent Bi(3)O6 octahedra, corners with four equivalent Bi(1)O6 octahedra, and  a cornercorner with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 44-52°. The Bi(2)-O(12) bond length is 2.19 Å. The Bi(2)-O(3) bond length is 2.13 Å. The Bi(2)-O(4) bond length is 2.19 Å. The Bi(2)-O(7) bond length is 2.14 Å. The Bi(2)-O(8) bond length is 2.18 Å. The Bi(2)-O(9) bond length is 2.23 Å. In the third Bi site, Bi(3) is bonded to one O(1), one O(12), one O(2), one O(5), one O(6), and one O(9) atom to form distorted BiO6 octahedra that share corners with two equivalent Bi(2)O6 octahedra, corners with four equivalent Bi(4)O6 octahedra,  a cornercorner with one Zn(2)O4 trigonal pyramid, and  an edgeedge with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 45-60°. The Bi(3)-O(1) bond length is 2.10 Å. The Bi(3)-O(12) bond length is 2.53 Å. The Bi(3)-O(2) bond length is 2.12 Å. The Bi(3)-O(5) bond length is 2.15 Å. The Bi(3)-O(6) bond length is 2.13 Å. The Bi(3)-O(9) bond length is 2.21 Å. In the fourth Bi site, Bi(4) is bonded to one O(1), one O(10), one O(11), one O(2), one O(5), and one O(6) atom to form distorted BiO6 octahedra that share corners with two equivalent Bi(1)O6 octahedra, corners with four equivalent Bi(3)O6 octahedra,  a cornercorner with one Zn(2)O4 trigonal pyramid, and  an edgeedge with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 45-60°. The Bi(4)-O(1) bond length is 2.38 Å. The Bi(4)-O(10) bond length is 2.67 Å. The Bi(4)-O(11) bond length is 2.22 Å. The Bi(4)-O(2) bond length is 2.40 Å. The Bi(4)-O(5) bond length is 2.24 Å. The Bi(4)-O(6) bond length is 2.25 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one Zn(1), one Bi(3), and one Bi(4) atom. In the second O site, O(2) is bonded in a distorted trigonal pyramidal geometry to one Mg(1), one Zn(2), one Bi(3), and one Bi(4) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one Zn(1), one Bi(1), and one Bi(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Mg(1), one Bi(1), and one Bi(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one Bi(3), and one Bi(4) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Zn(2), one Bi(3), and one Bi(4) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mg(1), one Bi(1), and one Bi(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Zn(1), one Bi(1), and one Bi(2) atom. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one Zn(1), one Bi(2), and one Bi(3) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Mg(1), one Zn(2), one Bi(1), and one Bi(4) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one Bi(1), and one Bi(4) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Mg(1), one Zn(2), one Bi(2), and one Bi(3) atom.