MgNi(TeO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(12), one O(2), one O(6), and one O(9) atom. Ni(1) is bonded to one O(1), one O(11), one O(4), one O(7), one O(8), and one O(9) atom to form distorted NiO6 octahedra that share  a cornercorner with one Te(3)O6 octahedra, corners with two equivalent Te(4)O6 octahedra,  an edgeedge with one Te(1)O6 octahedra, edges with two equivalent Te(2)O6 octahedra, and  a faceface with one Te(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-64°. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded to one O(10), one O(11), one O(2), one O(3), one O(5), and one O(8) atom to form TeO6 octahedra that share corners with two equivalent Te(3)O6 octahedra, corners with four equivalent Te(4)O6 octahedra, and  an edgeedge with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-46°. In the second Te site, Te(2) is bonded to one O(1), one O(12), one O(4), one O(6), one O(7), and one O(9) atom to form TeO6 octahedra that share corners with two equivalent Te(4)O6 octahedra, corners with four equivalent Te(3)O6 octahedra, and edges with two equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-53°. In the third Te site, Te(3) is bonded to one O(1), one O(11), one O(12), one O(2), one O(4), and one O(9) atom to form TeO6 octahedra that share  a cornercorner with one Ni(1)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, corners with four equivalent Te(2)O6 octahedra, and  a faceface with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-59°. In the fourth Te site, Te(4) is bonded to one O(10), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form distorted TeO6 octahedra that share corners with two equivalent Ni(1)O6 octahedra, corners with two equivalent Te(2)O6 octahedra, and corners with four equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-64°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted square co-planar geometry to one Mg(1), one Ni(1), one Te(2), and one Te(3) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mg(1), one Te(1), and one Te(3) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Te(1) and one Te(4) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Ni(1), one Te(2), and one Te(3) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Te(1) and one Te(4) atom. In the sixth O site, O(6) is bonded in a T-shaped geometry to one Mg(1), one Te(2), and one Te(4) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ni(1), one Te(2), and one Te(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ni(1), one Te(1), and one Te(4) atom. In the ninth O site, O(9) is bonded in a distorted see-saw-like geometry to one Mg(1), one Ni(1), one Te(2), and one Te(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Mg(1), one Te(1), and one Te(4) atom. In the eleventh O site, O(11) is bonded in a T-shaped geometry to one Ni(1), one Te(1), and one Te(3) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Mg(1), one Te(2), and one Te(3) atom.
MgNi(TeO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(12), one O(2), one O(6), and one O(9) atom. The Mg(1)-O(1) bond length is 2.43 Å. The Mg(1)-O(10) bond length is 1.96 Å. The Mg(1)-O(12) bond length is 2.09 Å. The Mg(1)-O(2) bond length is 1.99 Å. The Mg(1)-O(6) bond length is 2.14 Å. The Mg(1)-O(9) bond length is 2.43 Å. Ni(1) is bonded to one O(1), one O(11), one O(4), one O(7), one O(8), and one O(9) atom to form distorted NiO6 octahedra that share  a cornercorner with one Te(3)O6 octahedra, corners with two equivalent Te(4)O6 octahedra,  an edgeedge with one Te(1)O6 octahedra, edges with two equivalent Te(2)O6 octahedra, and  a faceface with one Te(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-64°. The Ni(1)-O(1) bond length is 2.18 Å. The Ni(1)-O(11) bond length is 2.08 Å. The Ni(1)-O(4) bond length is 2.05 Å. The Ni(1)-O(7) bond length is 2.06 Å. The Ni(1)-O(8) bond length is 2.02 Å. The Ni(1)-O(9) bond length is 2.21 Å. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded to one O(10), one O(11), one O(2), one O(3), one O(5), and one O(8) atom to form TeO6 octahedra that share corners with two equivalent Te(3)O6 octahedra, corners with four equivalent Te(4)O6 octahedra, and  an edgeedge with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-46°. The Te(1)-O(10) bond length is 1.90 Å. The Te(1)-O(11) bond length is 2.05 Å. The Te(1)-O(2) bond length is 1.95 Å. The Te(1)-O(3) bond length is 2.00 Å. The Te(1)-O(5) bond length is 1.98 Å. The Te(1)-O(8) bond length is 1.93 Å. In the second Te site, Te(2) is bonded to one O(1), one O(12), one O(4), one O(6), one O(7), and one O(9) atom to form TeO6 octahedra that share corners with two equivalent Te(4)O6 octahedra, corners with four equivalent Te(3)O6 octahedra, and edges with two equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-53°. The Te(2)-O(1) bond length is 1.97 Å. The Te(2)-O(12) bond length is 2.01 Å. The Te(2)-O(4) bond length is 2.00 Å. The Te(2)-O(6) bond length is 1.96 Å. The Te(2)-O(7) bond length is 1.95 Å. The Te(2)-O(9) bond length is 1.96 Å. In the third Te site, Te(3) is bonded to one O(1), one O(11), one O(12), one O(2), one O(4), and one O(9) atom to form TeO6 octahedra that share  a cornercorner with one Ni(1)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, corners with four equivalent Te(2)O6 octahedra, and  a faceface with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-59°. The Te(3)-O(1) bond length is 2.34 Å. The Te(3)-O(11) bond length is 2.06 Å. The Te(3)-O(12) bond length is 2.11 Å. The Te(3)-O(2) bond length is 2.30 Å. The Te(3)-O(4) bond length is 2.10 Å. The Te(3)-O(9) bond length is 2.28 Å. In the fourth Te site, Te(4) is bonded to one O(10), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form distorted TeO6 octahedra that share corners with two equivalent Ni(1)O6 octahedra, corners with two equivalent Te(2)O6 octahedra, and corners with four equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-64°. The Te(4)-O(10) bond length is 2.50 Å. The Te(4)-O(3) bond length is 1.97 Å. The Te(4)-O(5) bond length is 1.98 Å. The Te(4)-O(6) bond length is 2.16 Å. The Te(4)-O(7) bond length is 2.27 Å. The Te(4)-O(8) bond length is 2.45 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted square co-planar geometry to one Mg(1), one Ni(1), one Te(2), and one Te(3) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mg(1), one Te(1), and one Te(3) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Te(1) and one Te(4) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Ni(1), one Te(2), and one Te(3) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Te(1) and one Te(4) atom. In the sixth O site, O(6) is bonded in a T-shaped geometry to one Mg(1), one Te(2), and one Te(4) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ni(1), one Te(2), and one Te(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ni(1), one Te(1), and one Te(4) atom. In the ninth O site, O(9) is bonded in a distorted see-saw-like geometry to one Mg(1), one Ni(1), one Te(2), and one Te(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Mg(1), one Te(1), and one Te(4) atom. In the eleventh O site, O(11) is bonded in a T-shaped geometry to one Ni(1), one Te(1), and one Te(3) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Mg(1), one Te(2), and one Te(3) atom.