SrMg14CdO16 is alpha Po-derived structured and crystallizes in the orthorhombic Pmmm space group. Sr(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(8) atoms to form SrO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra; corners with two equivalent Mg(1)O6 octahedra; corners with two equivalent Cd(1)O6 octahedra; edges with four equivalent Mg(3)O6 octahedra; edges with four Mg(5,5)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedra are not tilted. There are nine inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent O(1), two equivalent O(6), and two equivalent O(9) atoms to form MgO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra; corners with two equivalent Mg(1)O6 octahedra; corners with two equivalent Mg(2)O6 octahedra; edges with four equivalent Mg(4)O6 octahedra; edges with four Mg(5,5)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedra are not tilted. In the second Mg site, Mg(2) is bonded to two O(2,2); two equivalent O(7); and two equivalent O(9) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra; corners with two equivalent Mg(2)O6 octahedra; corners with two equivalent Cd(1)O6 octahedra; edges with four equivalent Mg(4)O6 octahedra; edges with four Mg(6,6)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedra are not tilted. In the third Mg site, Mg(3) is bonded to one O(4), one O(5), two equivalent O(3), and two equivalent O(8) atoms to form MgO6 octahedra that share corners with two equivalent Mg(4)O6 octahedra; corners with four equivalent Mg(3)O6 octahedra; edges with two equivalent Sr(1)O6 octahedra; edges with two Mg(5,5)O6 octahedra; edges with two Mg(6,6)O6 octahedra; edges with two equivalent Cd(1)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the fourth Mg site, Mg(4) is bonded to one O(6), one O(7), two equivalent O(3), and two equivalent O(9) atoms to form a mixture of edge and corner-sharing MgO6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the fifth Mg site, Mg(5) is bonded to one O(4), one O(6), two equivalent O(1), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(6)O6 octahedra; corners with four Mg(5,5)O6 octahedra; edges with two equivalent Sr(1)O6 octahedra; edges with two equivalent Mg(1)O6 octahedra; edges with two equivalent Mg(3)O6 octahedra; edges with two equivalent Mg(4)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the sixth Mg site, Mg(6) is bonded to one O(5), one O(7), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(5)O6 octahedra; corners with four Mg(6,6)O6 octahedra; edges with two equivalent Mg(2)O6 octahedra; edges with two equivalent Mg(3)O6 octahedra; edges with two equivalent Mg(4)O6 octahedra; edges with two equivalent Cd(1)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the seventh Mg site, Mg(5) is bonded to one O(4), one O(6), two equivalent O(1), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(6)O6 octahedra; corners with four Mg(5,5)O6 octahedra; edges with two equivalent Sr(1)O6 octahedra; edges with two equivalent Mg(1)O6 octahedra; edges with two equivalent Mg(3)O6 octahedra; edges with two equivalent Mg(4)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the eighth Mg site, Mg(6) is bonded to one O(5), one O(7), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(5)O6 octahedra; corners with four Mg(6,6)O6 octahedra; edges with two equivalent Mg(2)O6 octahedra; edges with two equivalent Mg(3)O6 octahedra; edges with two equivalent Mg(4)O6 octahedra; edges with two equivalent Cd(1)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the ninth Mg site, Mg(7) is bonded to one O(1), one O(2), one O(8), one O(9), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with six equivalent Mg(7)O6 octahedra,  an edgeedge with one Sr(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Cd(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, and edges with two equivalent Mg(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. Cd(1) is bonded to two O(2,2); two equivalent O(5); and two equivalent O(8) atoms to form CdO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra; corners with two equivalent Mg(2)O6 octahedra; corners with two equivalent Cd(1)O6 octahedra; edges with four equivalent Mg(3)O6 octahedra; edges with four Mg(6,6)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedra are not tilted. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Mg(1), two equivalent Mg(5), and two equivalent Mg(7) atoms to form OSrMg5 octahedra that share corners with two equivalent O(2)Mg5Cd octahedra, corners with four equivalent O(1)SrMg5 octahedra, edges with two equivalent O(6)Mg6 octahedra, edges with two equivalent O(9)Mg6 octahedra, edges with two equivalent O(4)Sr2Mg4 octahedra, edges with two equivalent O(8)SrMg4Cd octahedra, and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the second O site, O(2) is bonded to one Mg(2), two equivalent Mg(6), two equivalent Mg(7), and one Cd(1) atom to form OMg5Cd octahedra that share corners with two equivalent O(1)SrMg5 octahedra; corners with four O(2,2)Mg5Cd octahedra; edges with two equivalent O(5)Mg4Cd2 octahedra; edges with two equivalent O(7)Mg6 octahedra; edges with two equivalent O(9)Mg6 octahedra; edges with two equivalent O(8)SrMg4Cd octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the third O site, O(2) is bonded to one Mg(2), two equivalent Mg(6), two equivalent Mg(7), and one Cd(1) atom to form OMg5Cd octahedra that share corners with two equivalent O(1)SrMg5 octahedra; corners with four O(2,2)Mg5Cd octahedra; edges with two equivalent O(5)Mg4Cd2 octahedra; edges with two equivalent O(7)Mg6 octahedra; edges with two equivalent O(9)Mg6 octahedra; edges with two equivalent O(8)SrMg4Cd octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the fourth O site, O(3) is bonded to one Mg(3), one Mg(4), one Mg(5), one Mg(6), and two equivalent Mg(7) atoms to form OMg6 octahedra that share corners with six equivalent O(3)Mg6 octahedra,  an edgeedge with one O(5)Mg4Cd2 octahedra,  an edgeedge with one O(6)Mg6 octahedra,  an edgeedge with one O(7)Mg6 octahedra,  an edgeedge with one O(4)Sr2Mg4 octahedra, edges with two equivalent O(2)Mg5Cd octahedra, edges with two equivalent O(9)Mg6 octahedra, edges with two equivalent O(8)SrMg4Cd octahedra, and edges with two equivalent O(1)SrMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the fifth O site, O(4) is bonded to two equivalent Sr(1); two equivalent Mg(3); and two Mg(5,5) atoms to form OSr2Mg4 octahedra that share corners with two equivalent O(5)Mg4Cd2 octahedra, corners with two equivalent O(6)Mg6 octahedra, corners with two equivalent O(4)Sr2Mg4 octahedra, edges with four equivalent O(3)Mg6 octahedra, edges with four equivalent O(8)SrMg4Cd octahedra, and edges with four equivalent O(1)SrMg5 octahedra. The corner-sharing octahedra are not tilted. In the sixth O site, O(5) is bonded to two equivalent Mg(3); two Mg(6,6); and two equivalent Cd(1) atoms to form OMg4Cd2 octahedra that share corners with two equivalent O(5)Mg4Cd2 octahedra; corners with two equivalent O(7)Mg6 octahedra; corners with two equivalent O(4)Sr2Mg4 octahedra; edges with four O(2,2)Mg5Cd octahedra; edges with four equivalent O(3)Mg6 octahedra; and edges with four equivalent O(8)SrMg4Cd octahedra. The corner-sharing octahedra are not tilted. In the seventh O site, O(6) is bonded to two equivalent Mg(1); two equivalent Mg(4); and two Mg(5,5) atoms to form OMg6 octahedra that share corners with two equivalent O(6)Mg6 octahedra, corners with two equivalent O(7)Mg6 octahedra, corners with two equivalent O(4)Sr2Mg4 octahedra, edges with four equivalent O(3)Mg6 octahedra, edges with four equivalent O(9)Mg6 octahedra, and edges with four equivalent O(1)SrMg5 octahedra. The corner-sharing octahedra are not tilted. In the eighth O site, O(7) is bonded to two equivalent Mg(2); two equivalent Mg(4); and two Mg(6,6) atoms to form OMg6 octahedra that share corners with two equivalent O(5)Mg4Cd2 octahedra; corners with two equivalent O(6)Mg6 octahedra; corners with two equivalent O(7)Mg6 octahedra; edges with four O(2,2)Mg5Cd octahedra; edges with four equivalent O(3)Mg6 octahedra; and edges with four equivalent O(9)Mg6 octahedra. The corner-sharing octahedra are not tilted. In the ninth O site, O(8) is bonded to one Sr(1), two equivalent Mg(3), two equivalent Mg(7), and one Cd(1) atom to form OSrMg4Cd octahedra that share corners with two equivalent O(9)Mg6 octahedra; corners with four equivalent O(8)SrMg4Cd octahedra; edges with two equivalent O(5)Mg4Cd2 octahedra; edges with two O(2,2)Mg5Cd octahedra; edges with two equivalent O(4)Sr2Mg4 octahedra; edges with two equivalent O(1)SrMg5 octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the tenth O site, O(9) is bonded to one Mg(1), one Mg(2), two equivalent Mg(4), and two equivalent Mg(7) atoms to form OMg6 octahedra that share corners with two equivalent O(8)SrMg4Cd octahedra; corners with four equivalent O(9)Mg6 octahedra; edges with two O(2,2)Mg5Cd octahedra; edges with two equivalent O(6)Mg6 octahedra; edges with two equivalent O(7)Mg6 octahedra; edges with two equivalent O(1)SrMg5 octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedra are not tilted.
SrMg14CdO16 is alpha Po-derived structured and crystallizes in the orthorhombic Pmmm space group. Sr(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(8) atoms to form SrO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra; corners with two equivalent Mg(1)O6 octahedra; corners with two equivalent Cd(1)O6 octahedra; edges with four equivalent Mg(3)O6 octahedra; edges with four Mg(5,5)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedra are not tilted. Both Sr(1)-O(1) bond lengths are 2.37 Å. Both Sr(1)-O(4) bond lengths are 2.22 Å. Both Sr(1)-O(8) bond lengths are 2.27 Å. There are nine inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent O(1), two equivalent O(6), and two equivalent O(9) atoms to form MgO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra; corners with two equivalent Mg(1)O6 octahedra; corners with two equivalent Mg(2)O6 octahedra; edges with four equivalent Mg(4)O6 octahedra; edges with four Mg(5,5)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedra are not tilted. Both Mg(1)-O(1) bond lengths are 1.99 Å. Both Mg(1)-O(6) bond lengths are 2.22 Å. Both Mg(1)-O(9) bond lengths are 2.21 Å. In the second Mg site, Mg(2) is bonded to two O(2,2); two equivalent O(7); and two equivalent O(9) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra; corners with two equivalent Mg(2)O6 octahedra; corners with two equivalent Cd(1)O6 octahedra; edges with four equivalent Mg(4)O6 octahedra; edges with four Mg(6,6)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedra are not tilted. Both Mg(2)-O(2,2) bond lengths are 2.01 Å. Both Mg(2)-O(7) bond lengths are 2.22 Å. Both Mg(2)-O(9) bond lengths are 2.18 Å. In the third Mg site, Mg(3) is bonded to one O(4), one O(5), two equivalent O(3), and two equivalent O(8) atoms to form MgO6 octahedra that share corners with two equivalent Mg(4)O6 octahedra; corners with four equivalent Mg(3)O6 octahedra; edges with two equivalent Sr(1)O6 octahedra; edges with two Mg(5,5)O6 octahedra; edges with two Mg(6,6)O6 octahedra; edges with two equivalent Cd(1)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. The Mg(3)-O(4) bond length is 2.25 Å. The Mg(3)-O(5) bond length is 2.15 Å. Both Mg(3)-O(3) bond lengths are 2.18 Å. Both Mg(3)-O(8) bond lengths are 2.22 Å. In the fourth Mg site, Mg(4) is bonded to one O(6), one O(7), two equivalent O(3), and two equivalent O(9) atoms to form a mixture of edge and corner-sharing MgO6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. The Mg(4)-O(6) bond length is 2.20 Å. The Mg(4)-O(7) bond length is 2.19 Å. Both Mg(4)-O(3) bond lengths are 2.18 Å. Both Mg(4)-O(9) bond lengths are 2.22 Å. In the fifth Mg site, Mg(5) is bonded to one O(4), one O(6), two equivalent O(1), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(6)O6 octahedra; corners with four Mg(5,5)O6 octahedra; edges with two equivalent Sr(1)O6 octahedra; edges with two equivalent Mg(1)O6 octahedra; edges with two equivalent Mg(3)O6 octahedra; edges with two equivalent Mg(4)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. The Mg(5)-O(4) bond length is 2.26 Å. The Mg(5)-O(6) bond length is 2.09 Å. Both Mg(5)-O(1) bond lengths are 2.22 Å. Both Mg(5)-O(3) bond lengths are 2.20 Å. In the sixth Mg site, Mg(6) is bonded to one O(5), one O(7), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(5)O6 octahedra; corners with four Mg(6,6)O6 octahedra; edges with two equivalent Mg(2)O6 octahedra; edges with two equivalent Mg(3)O6 octahedra; edges with two equivalent Mg(4)O6 octahedra; edges with two equivalent Cd(1)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. The Mg(6)-O(5) bond length is 2.23 Å. The Mg(6)-O(7) bond length is 2.13 Å. Both Mg(6)-O(2) bond lengths are 2.22 Å. Both Mg(6)-O(3) bond lengths are 2.19 Å. In the seventh Mg site, Mg(5) is bonded to one O(4), one O(6), two equivalent O(1), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(6)O6 octahedra; corners with four Mg(5,5)O6 octahedra; edges with two equivalent Sr(1)O6 octahedra; edges with two equivalent Mg(1)O6 octahedra; edges with two equivalent Mg(3)O6 octahedra; edges with two equivalent Mg(4)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. The Mg(5)-O(4) bond length is 2.26 Å. The Mg(5)-O(6) bond length is 2.09 Å. Both Mg(5)-O(1) bond lengths are 2.22 Å. Both Mg(5)-O(3) bond lengths are 2.20 Å. In the eighth Mg site, Mg(6) is bonded to one O(5), one O(7), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(5)O6 octahedra; corners with four Mg(6,6)O6 octahedra; edges with two equivalent Mg(2)O6 octahedra; edges with two equivalent Mg(3)O6 octahedra; edges with two equivalent Mg(4)O6 octahedra; edges with two equivalent Cd(1)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. The Mg(6)-O(5) bond length is 2.23 Å. The Mg(6)-O(7) bond length is 2.13 Å. Both Mg(6)-O(2) bond lengths are 2.22 Å. Both Mg(6)-O(3) bond lengths are 2.19 Å. In the ninth Mg site, Mg(7) is bonded to one O(1), one O(2), one O(8), one O(9), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with six equivalent Mg(7)O6 octahedra,  an edgeedge with one Sr(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Cd(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, and edges with two equivalent Mg(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. The Mg(7)-O(1) bond length is 2.23 Å. The Mg(7)-O(2) bond length is 2.17 Å. The Mg(7)-O(8) bond length is 2.25 Å. The Mg(7)-O(9) bond length is 2.11 Å. Both Mg(7)-O(3) bond lengths are 2.22 Å. Cd(1) is bonded to two O(2,2); two equivalent O(5); and two equivalent O(8) atoms to form CdO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra; corners with two equivalent Mg(2)O6 octahedra; corners with two equivalent Cd(1)O6 octahedra; edges with four equivalent Mg(3)O6 octahedra; edges with four Mg(6,6)O6 octahedra; and edges with four equivalent Mg(7)O6 octahedra. The corner-sharing octahedra are not tilted. Both Cd(1)-O(2,2) bond lengths are 2.35 Å. Both Cd(1)-O(5) bond lengths are 2.22 Å. Both Cd(1)-O(8) bond lengths are 2.13 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Mg(1), two equivalent Mg(5), and two equivalent Mg(7) atoms to form OSrMg5 octahedra that share corners with two equivalent O(2)Mg5Cd octahedra, corners with four equivalent O(1)SrMg5 octahedra, edges with two equivalent O(6)Mg6 octahedra, edges with two equivalent O(9)Mg6 octahedra, edges with two equivalent O(4)Sr2Mg4 octahedra, edges with two equivalent O(8)SrMg4Cd octahedra, and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the second O site, O(2) is bonded to one Mg(2), two equivalent Mg(6), two equivalent Mg(7), and one Cd(1) atom to form OMg5Cd octahedra that share corners with two equivalent O(1)SrMg5 octahedra; corners with four O(2,2)Mg5Cd octahedra; edges with two equivalent O(5)Mg4Cd2 octahedra; edges with two equivalent O(7)Mg6 octahedra; edges with two equivalent O(9)Mg6 octahedra; edges with two equivalent O(8)SrMg4Cd octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the third O site, O(2) is bonded to one Mg(2), two equivalent Mg(6), two equivalent Mg(7), and one Cd(1) atom to form OMg5Cd octahedra that share corners with two equivalent O(1)SrMg5 octahedra; corners with four O(2,2)Mg5Cd octahedra; edges with two equivalent O(5)Mg4Cd2 octahedra; edges with two equivalent O(7)Mg6 octahedra; edges with two equivalent O(9)Mg6 octahedra; edges with two equivalent O(8)SrMg4Cd octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. Both O(2)-Mg(7) bond lengths are 2.17 Å. In the fourth O site, O(3) is bonded to one Mg(3), one Mg(4), one Mg(5), one Mg(6), and two equivalent Mg(7) atoms to form OMg6 octahedra that share corners with six equivalent O(3)Mg6 octahedra,  an edgeedge with one O(5)Mg4Cd2 octahedra,  an edgeedge with one O(6)Mg6 octahedra,  an edgeedge with one O(7)Mg6 octahedra,  an edgeedge with one O(4)Sr2Mg4 octahedra, edges with two equivalent O(2)Mg5Cd octahedra, edges with two equivalent O(9)Mg6 octahedra, edges with two equivalent O(8)SrMg4Cd octahedra, and edges with two equivalent O(1)SrMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the fifth O site, O(4) is bonded to two equivalent Sr(1); two equivalent Mg(3); and two Mg(5,5) atoms to form OSr2Mg4 octahedra that share corners with two equivalent O(5)Mg4Cd2 octahedra, corners with two equivalent O(6)Mg6 octahedra, corners with two equivalent O(4)Sr2Mg4 octahedra, edges with four equivalent O(3)Mg6 octahedra, edges with four equivalent O(8)SrMg4Cd octahedra, and edges with four equivalent O(1)SrMg5 octahedra. The corner-sharing octahedra are not tilted. In the sixth O site, O(5) is bonded to two equivalent Mg(3); two Mg(6,6); and two equivalent Cd(1) atoms to form OMg4Cd2 octahedra that share corners with two equivalent O(5)Mg4Cd2 octahedra; corners with two equivalent O(7)Mg6 octahedra; corners with two equivalent O(4)Sr2Mg4 octahedra; edges with four O(2,2)Mg5Cd octahedra; edges with four equivalent O(3)Mg6 octahedra; and edges with four equivalent O(8)SrMg4Cd octahedra. The corner-sharing octahedra are not tilted. In the seventh O site, O(6) is bonded to two equivalent Mg(1); two equivalent Mg(4); and two Mg(5,5) atoms to form OMg6 octahedra that share corners with two equivalent O(6)Mg6 octahedra, corners with two equivalent O(7)Mg6 octahedra, corners with two equivalent O(4)Sr2Mg4 octahedra, edges with four equivalent O(3)Mg6 octahedra, edges with four equivalent O(9)Mg6 octahedra, and edges with four equivalent O(1)SrMg5 octahedra. The corner-sharing octahedra are not tilted. In the eighth O site, O(7) is bonded to two equivalent Mg(2); two equivalent Mg(4); and two Mg(6,6) atoms to form OMg6 octahedra that share corners with two equivalent O(5)Mg4Cd2 octahedra; corners with two equivalent O(6)Mg6 octahedra; corners with two equivalent O(7)Mg6 octahedra; edges with four O(2,2)Mg5Cd octahedra; edges with four equivalent O(3)Mg6 octahedra; and edges with four equivalent O(9)Mg6 octahedra. The corner-sharing octahedra are not tilted. In the ninth O site, O(8) is bonded to one Sr(1), two equivalent Mg(3), two equivalent Mg(7), and one Cd(1) atom to form OSrMg4Cd octahedra that share corners with two equivalent O(9)Mg6 octahedra; corners with four equivalent O(8)SrMg4Cd octahedra; edges with two equivalent O(5)Mg4Cd2 octahedra; edges with two O(2,2)Mg5Cd octahedra; edges with two equivalent O(4)Sr2Mg4 octahedra; edges with two equivalent O(1)SrMg5 octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the tenth O site, O(9) is bonded to one Mg(1), one Mg(2), two equivalent Mg(4), and two equivalent Mg(7) atoms to form OMg6 octahedra that share corners with two equivalent O(8)SrMg4Cd octahedra; corners with four equivalent O(9)Mg6 octahedra; edges with two O(2,2)Mg5Cd octahedra; edges with two equivalent O(6)Mg6 octahedra; edges with two equivalent O(7)Mg6 octahedra; edges with two equivalent O(1)SrMg5 octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedra are not tilted.