MgNi2(MoO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(4), one O(5), one O(6), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra, corners with two equivalent Mo(1)O6 octahedra,  an edgeedge with one Mo(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, edges with two equivalent Mo(2)O6 octahedra, and  a faceface with one Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 2-67°. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted MoO6 octahedra that share corners with four equivalent Ni(1)O6 octahedra, corners with four equivalent Ni(2)O6 octahedra, corners with two equivalent Mg(1)O5 trigonal bipyramids, edges with two equivalent Mo(2)O6 octahedra, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 30-65°. In the second Mo site, Mo(2) is bonded to one O(1), one O(2), one O(5), one O(6), one O(7), and one O(8) atom to form distorted MoO6 octahedra that share corners with four equivalent Ni(1)O6 octahedra, corners with four equivalent Ni(2)O6 octahedra, edges with two equivalent Mo(1)O6 octahedra, and edges with two equivalent Mg(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 32-62°. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form NiO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra, corners with four equivalent Mo(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, edges with two equivalent Ni(2)O6 octahedra, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 32-62°. In the second Ni site, Ni(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted NiO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra, corners with four equivalent Mo(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, edges with two equivalent Ni(1)O6 octahedra, and  a faceface with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 30-65°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mo(2), one Ni(1), and one Ni(2) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Mg(1), one Mo(2), one Ni(1), and one Ni(2) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mo(1), one Ni(1), and one Ni(2) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mo(1), one Ni(1), and one Ni(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mo(1), one Mo(2), and one Ni(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mg(1), one Mo(1), one Mo(2), and one Ni(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mo(1), one Mo(2), and one Ni(1) atom. In the eighth O site, O(8) is bonded in a trigonal pyramidal geometry to one Mg(1), one Mo(1), one Mo(2), and one Ni(1) atom.
MgNi2(MoO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(4), one O(5), one O(6), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra, corners with two equivalent Mo(1)O6 octahedra,  an edgeedge with one Mo(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, edges with two equivalent Mo(2)O6 octahedra, and  a faceface with one Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 2-67°. The Mg(1)-O(2) bond length is 2.07 Å. The Mg(1)-O(4) bond length is 2.12 Å. The Mg(1)-O(5) bond length is 2.14 Å. The Mg(1)-O(6) bond length is 1.93 Å. The Mg(1)-O(8) bond length is 1.92 Å. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted MoO6 octahedra that share corners with four equivalent Ni(1)O6 octahedra, corners with four equivalent Ni(2)O6 octahedra, corners with two equivalent Mg(1)O5 trigonal bipyramids, edges with two equivalent Mo(2)O6 octahedra, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 30-65°. The Mo(1)-O(3) bond length is 1.84 Å. The Mo(1)-O(4) bond length is 1.99 Å. The Mo(1)-O(5) bond length is 2.02 Å. The Mo(1)-O(6) bond length is 2.10 Å. The Mo(1)-O(7) bond length is 2.17 Å. The Mo(1)-O(8) bond length is 2.11 Å. In the second Mo site, Mo(2) is bonded to one O(1), one O(2), one O(5), one O(6), one O(7), and one O(8) atom to form distorted MoO6 octahedra that share corners with four equivalent Ni(1)O6 octahedra, corners with four equivalent Ni(2)O6 octahedra, edges with two equivalent Mo(1)O6 octahedra, and edges with two equivalent Mg(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 32-62°. The Mo(2)-O(1) bond length is 1.83 Å. The Mo(2)-O(2) bond length is 1.99 Å. The Mo(2)-O(5) bond length is 2.16 Å. The Mo(2)-O(6) bond length is 2.14 Å. The Mo(2)-O(7) bond length is 1.95 Å. The Mo(2)-O(8) bond length is 2.13 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form NiO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra, corners with four equivalent Mo(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, edges with two equivalent Ni(2)O6 octahedra, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 32-62°. The Ni(1)-O(1) bond length is 2.11 Å. The Ni(1)-O(2) bond length is 2.12 Å. The Ni(1)-O(3) bond length is 2.05 Å. The Ni(1)-O(4) bond length is 2.10 Å. The Ni(1)-O(7) bond length is 2.27 Å. The Ni(1)-O(8) bond length is 2.11 Å. In the second Ni site, Ni(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted NiO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra, corners with four equivalent Mo(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, edges with two equivalent Ni(1)O6 octahedra, and  a faceface with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 30-65°. The Ni(2)-O(1) bond length is 2.00 Å. The Ni(2)-O(2) bond length is 2.00 Å. The Ni(2)-O(3) bond length is 2.07 Å. The Ni(2)-O(4) bond length is 2.21 Å. The Ni(2)-O(5) bond length is 2.36 Å. The Ni(2)-O(6) bond length is 2.15 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mo(2), one Ni(1), and one Ni(2) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Mg(1), one Mo(2), one Ni(1), and one Ni(2) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mo(1), one Ni(1), and one Ni(2) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mo(1), one Ni(1), and one Ni(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mo(1), one Mo(2), and one Ni(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mg(1), one Mo(1), one Mo(2), and one Ni(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mo(1), one Mo(2), and one Ni(1) atom. In the eighth O site, O(8) is bonded in a trigonal pyramidal geometry to one Mg(1), one Mo(1), one Mo(2), and one Ni(1) atom.