Sr4MgIn2(SbO6)2 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(3), one O(4), one O(5), one O(6), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(7), one O(9), and two equivalent O(8) atoms. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one Mg(1), one O(1), one O(11), one O(12), one O(2), one O(4), one O(7), and one O(8) atom. Mg(1) is bonded to one Sr(4), one O(2), one O(7), one O(8), and one O(9) atom to form distorted MgSrO4 tetrahedra that share  a cornercorner with one In(1)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one O(4)Sr3InSb square pyramid, and  an edgeedge with one In(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 43-59°. There are two inequivalent In sites. In the first In site, In(1) is bonded to one O(1), one O(10), one O(12), one O(3), one O(4), and one O(7) atom to form InO6 octahedra that share corners with four equivalent Sb(1)O6 octahedra and  a cornercorner with one Mg(1)SrO4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-39°. In the second In site, In(2) is bonded to one O(11), one O(2), one O(5), one O(6), and one O(9) atom to form distorted InO5 trigonal bipyramids that share  a cornercorner with one Sb(1)O6 octahedra and  an edgeedge with one Mg(1)SrO4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(10), one O(12), one O(4), one O(6), and one O(8) atom to form SbO6 octahedra that share corners with four equivalent In(1)O6 octahedra,  a cornercorner with one Mg(1)SrO4 tetrahedra, and  a cornercorner with one In(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 29-39°. In the second Sb site, Sb(2) is bonded in a 6-coordinate geometry to one O(11), one O(2), one O(3), one O(5), one O(7), and one O(9) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one In(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Mg(1), one In(2), and one Sb(2) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one In(1), and one Sb(2) atom to form distorted OSr2InSb trigonal pyramids that share  a cornercorner with one O(4)Sr3InSb square pyramid, corners with two equivalent O(6)Sr2InSb tetrahedra, corners with three equivalent O(10)Sr2InSb tetrahedra, and  an edgeedge with one O(4)Sr3InSb square pyramid. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(2), one Sr(4), one In(1), and one Sb(1) atom to form distorted OSr3InSb square pyramids that share  a cornercorner with one Mg(1)SrO4 tetrahedra, corners with three equivalent O(6)Sr2InSb tetrahedra,  a cornercorner with one O(3)Sr2InSb trigonal pyramid, edges with two equivalent O(10)Sr2InSb tetrahedra, and  an edgeedge with one O(3)Sr2InSb trigonal pyramid. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one In(2), and one Sb(2) atom. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(2), one In(2), and one Sb(1) atom to form OSr2InSb tetrahedra that share corners with three equivalent O(4)Sr3InSb square pyramids,  a cornercorner with one O(10)Sr2InSb tetrahedra, corners with two equivalent O(3)Sr2InSb trigonal pyramids, and  an edgeedge with one O(10)Sr2InSb tetrahedra. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(4), one Mg(1), one In(1), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(4), two equivalent Sr(3), one Mg(1), and one Sb(1) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(3), one Mg(1), one In(2), and one Sb(2) atom. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one In(1), and one Sb(1) atom to form distorted OSr2InSb tetrahedra that share  a cornercorner with one O(6)Sr2InSb tetrahedra, corners with three equivalent O(3)Sr2InSb trigonal pyramids, edges with two equivalent O(4)Sr3InSb square pyramids, and  an edgeedge with one O(6)Sr2InSb tetrahedra. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), one In(2), and one Sb(2) atom. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Sr(3), one Sr(4), one In(1), and one Sb(1) atom.
Sr4MgIn2(SbO6)2 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(3), one O(4), one O(5), one O(6), and one O(9) atom. The Sr(1)-O(10) bond length is 2.49 Å. The Sr(1)-O(11) bond length is 3.18 Å. The Sr(1)-O(12) bond length is 3.05 Å. The Sr(1)-O(3) bond length is 2.67 Å. The Sr(1)-O(4) bond length is 2.64 Å. The Sr(1)-O(5) bond length is 2.78 Å. The Sr(1)-O(6) bond length is 2.46 Å. The Sr(1)-O(9) bond length is 2.60 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The Sr(2)-O(1) bond length is 2.90 Å. The Sr(2)-O(10) bond length is 2.60 Å. The Sr(2)-O(2) bond length is 2.91 Å. The Sr(2)-O(3) bond length is 2.50 Å. The Sr(2)-O(4) bond length is 2.62 Å. The Sr(2)-O(5) bond length is 2.50 Å. The Sr(2)-O(6) bond length is 2.61 Å. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(7), one O(9), and two equivalent O(8) atoms. The Sr(3)-O(1) bond length is 2.63 Å. The Sr(3)-O(11) bond length is 2.54 Å. The Sr(3)-O(12) bond length is 2.54 Å. The Sr(3)-O(2) bond length is 2.56 Å. The Sr(3)-O(7) bond length is 2.94 Å. The Sr(3)-O(9) bond length is 2.66 Å. There is one shorter (3.03 Å) and one longer (3.04 Å) Sr(3)-O(8) bond length. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one Mg(1), one O(1), one O(11), one O(12), one O(2), one O(4), one O(7), and one O(8) atom. The Sr(4)-Mg(1) bond length is 2.83 Å. The Sr(4)-O(1) bond length is 2.58 Å. The Sr(4)-O(11) bond length is 2.65 Å. The Sr(4)-O(12) bond length is 2.48 Å. The Sr(4)-O(2) bond length is 2.98 Å. The Sr(4)-O(4) bond length is 2.78 Å. The Sr(4)-O(7) bond length is 2.62 Å. The Sr(4)-O(8) bond length is 2.49 Å. Mg(1) is bonded to one Sr(4), one O(2), one O(7), one O(8), and one O(9) atom to form distorted MgSrO4 tetrahedra that share  a cornercorner with one In(1)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one O(4)Sr3InSb square pyramid, and  an edgeedge with one In(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 43-59°. The Mg(1)-O(2) bond length is 1.94 Å. The Mg(1)-O(7) bond length is 1.96 Å. The Mg(1)-O(8) bond length is 1.96 Å. The Mg(1)-O(9) bond length is 1.98 Å. There are two inequivalent In sites. In the first In site, In(1) is bonded to one O(1), one O(10), one O(12), one O(3), one O(4), and one O(7) atom to form InO6 octahedra that share corners with four equivalent Sb(1)O6 octahedra and  a cornercorner with one Mg(1)SrO4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-39°. The In(1)-O(1) bond length is 2.57 Å. The In(1)-O(10) bond length is 2.24 Å. The In(1)-O(12) bond length is 2.39 Å. The In(1)-O(3) bond length is 2.16 Å. The In(1)-O(4) bond length is 2.41 Å. The In(1)-O(7) bond length is 2.10 Å. In the second In site, In(2) is bonded to one O(11), one O(2), one O(5), one O(6), and one O(9) atom to form distorted InO5 trigonal bipyramids that share  a cornercorner with one Sb(1)O6 octahedra and  an edgeedge with one Mg(1)SrO4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. The In(2)-O(11) bond length is 2.11 Å. The In(2)-O(2) bond length is 2.34 Å. The In(2)-O(5) bond length is 2.20 Å. The In(2)-O(6) bond length is 2.11 Å. The In(2)-O(9) bond length is 2.13 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(10), one O(12), one O(4), one O(6), and one O(8) atom to form SbO6 octahedra that share corners with four equivalent In(1)O6 octahedra,  a cornercorner with one Mg(1)SrO4 tetrahedra, and  a cornercorner with one In(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 29-39°. The Sb(1)-O(1) bond length is 2.07 Å. The Sb(1)-O(10) bond length is 2.03 Å. The Sb(1)-O(12) bond length is 2.10 Å. The Sb(1)-O(4) bond length is 2.07 Å. The Sb(1)-O(6) bond length is 2.01 Å. The Sb(1)-O(8) bond length is 2.01 Å. In the second Sb site, Sb(2) is bonded in a 6-coordinate geometry to one O(11), one O(2), one O(3), one O(5), one O(7), and one O(9) atom. The Sb(2)-O(11) bond length is 2.09 Å. The Sb(2)-O(2) bond length is 2.71 Å. The Sb(2)-O(3) bond length is 2.08 Å. The Sb(2)-O(5) bond length is 2.07 Å. The Sb(2)-O(7) bond length is 2.73 Å. The Sb(2)-O(9) bond length is 2.58 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one In(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Mg(1), one In(2), and one Sb(2) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one In(1), and one Sb(2) atom to form distorted OSr2InSb trigonal pyramids that share  a cornercorner with one O(4)Sr3InSb square pyramid, corners with two equivalent O(6)Sr2InSb tetrahedra, corners with three equivalent O(10)Sr2InSb tetrahedra, and  an edgeedge with one O(4)Sr3InSb square pyramid. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(2), one Sr(4), one In(1), and one Sb(1) atom to form distorted OSr3InSb square pyramids that share  a cornercorner with one Mg(1)SrO4 tetrahedra, corners with three equivalent O(6)Sr2InSb tetrahedra,  a cornercorner with one O(3)Sr2InSb trigonal pyramid, edges with two equivalent O(10)Sr2InSb tetrahedra, and  an edgeedge with one O(3)Sr2InSb trigonal pyramid. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one In(2), and one Sb(2) atom. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(2), one In(2), and one Sb(1) atom to form OSr2InSb tetrahedra that share corners with three equivalent O(4)Sr3InSb square pyramids,  a cornercorner with one O(10)Sr2InSb tetrahedra, corners with two equivalent O(3)Sr2InSb trigonal pyramids, and  an edgeedge with one O(10)Sr2InSb tetrahedra. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(4), one Mg(1), one In(1), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(4), two equivalent Sr(3), one Mg(1), and one Sb(1) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(3), one Mg(1), one In(2), and one Sb(2) atom. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one In(1), and one Sb(1) atom to form distorted OSr2InSb tetrahedra that share  a cornercorner with one O(6)Sr2InSb tetrahedra, corners with three equivalent O(3)Sr2InSb trigonal pyramids, edges with two equivalent O(4)Sr3InSb square pyramids, and  an edgeedge with one O(6)Sr2InSb tetrahedra. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), one In(2), and one Sb(2) atom. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Sr(3), one Sr(4), one In(1), and one Sb(1) atom.