Sr2MgTeO6 crystallizes in the monoclinic C2/m space group. Sr(1) is bonded to four equivalent O(1) and eight equivalent O(2) atoms to form distorted SrO12 cuboctahedra that share corners with twelve equivalent Sr(1)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Mg(1)O6 octahedra, and faces with four equivalent Te(1)O6 octahedra. Mg(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form MgO6 octahedra that share corners with six equivalent Te(1)O6 octahedra and faces with eight equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 11-15°. Te(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form TeO6 octahedra that share corners with six equivalent Mg(1)O6 octahedra and faces with eight equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 11-15°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to four equivalent Sr(1), one Mg(1), and one Te(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent Sr(1), one Mg(1), and one Te(1) atom.
Sr2MgTeO6 crystallizes in the monoclinic C2/m space group. Sr(1) is bonded to four equivalent O(1) and eight equivalent O(2) atoms to form distorted SrO12 cuboctahedra that share corners with twelve equivalent Sr(1)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Mg(1)O6 octahedra, and faces with four equivalent Te(1)O6 octahedra. There are a spread of Sr(1)-O(1) bond distances ranging from 2.57-3.06 Å. There are a spread of Sr(1)-O(2) bond distances ranging from 2.66-2.95 Å. Mg(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form MgO6 octahedra that share corners with six equivalent Te(1)O6 octahedra and faces with eight equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 11-15°. Both Mg(1)-O(1) bond lengths are 2.06 Å. All Mg(1)-O(2) bond lengths are 2.07 Å. Te(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form TeO6 octahedra that share corners with six equivalent Mg(1)O6 octahedra and faces with eight equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 11-15°. Both Te(1)-O(1) bond lengths are 1.92 Å. All Te(1)-O(2) bond lengths are 1.92 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to four equivalent Sr(1), one Mg(1), and one Te(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent Sr(1), one Mg(1), and one Te(1) atom.