CsRbMg14O15 crystallizes in the orthorhombic Pmm2 space group. Cs(1) is bonded in a 4-coordinate geometry to two equivalent O(10) and two equivalent O(7) atoms. Rb(1) is bonded to one O(2), two equivalent O(10), and two equivalent O(6) atoms to form distorted RbO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Mg(7)O5 square pyramids, corners with two equivalent Rb(1)O5 trigonal bipyramids, and edges with four equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-62°. There are ten inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(1), one O(2), two equivalent O(11), and two equivalent O(8) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra,  a cornercorner with one Rb(1)O5 trigonal bipyramid, corners with two equivalent Mg(2)O5 trigonal bipyramids, edges with two equivalent Mg(5)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with two equivalent Mg(7)O5 square pyramids. The corner-sharing octahedral tilt angles are 3°. In the second Mg site, Mg(2) is bonded to one O(3), two equivalent O(11), and two equivalent O(9) atoms to form MgO5 trigonal bipyramids that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O5 trigonal bipyramids, edges with two equivalent Mg(8)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles are 20°. In the third Mg site, Mg(3) is bonded to one O(4), one O(5), one O(6), one O(7), and two equivalent O(10) atoms to form distorted MgO6 octahedra that share corners with two equivalent Mg(4)O6 octahedra, corners with four equivalent Mg(3)O6 octahedra,  a cornercorner with one Mg(7)O5 square pyramid,  an edgeedge with one Mg(5)O6 octahedra,  an edgeedge with one Mg(8)O6 octahedra, and edges with two equivalent Rb(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 4-26°. In the fourth Mg site, Mg(4) is bonded to one O(4), one O(5), one O(8), one O(9), and two equivalent O(11) atoms to form MgO6 octahedra that share corners with two equivalent Mg(3)O6 octahedra, corners with four equivalent Mg(4)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra,  an edgeedge with one Mg(8)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra,  an edgeedge with one Mg(7)O5 square pyramid, and edges with two equivalent Mg(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-18°. In the fifth Mg site, Mg(5) is bonded to one O(6), one O(8), two equivalent O(1), and two equivalent O(4) atoms to form distorted MgO6 octahedra that share corners with two equivalent Mg(5)O6 octahedra,  a cornercorner with one Mg(7)O5 square pyramid, corners with two equivalent Rb(1)O5 trigonal bipyramids, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, and edges with two equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles are 9°. In the sixth Mg site, Mg(6) is bonded in a 3-coordinate geometry to one O(9) and two equivalent O(4) atoms. In the seventh Mg site, Mg(7) is bonded to one O(8), two equivalent O(2), and two equivalent O(5) atoms to form MgO5 square pyramids that share  a cornercorner with one Mg(5)O6 octahedra, corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Mg(8)O6 octahedra, corners with two equivalent Mg(7)O5 square pyramids, corners with two equivalent Rb(1)O5 trigonal bipyramids, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-79°. In the eighth Mg site, Mg(8) is bonded to one O(7), one O(9), two equivalent O(3), and two equivalent O(5) atoms to form distorted MgO6 octahedra that share corners with two equivalent Mg(8)O6 octahedra, corners with two equivalent Mg(7)O5 square pyramids, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, and edges with two equivalent Mg(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 20°. In the ninth Mg site, Mg(9) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(11), and two equivalent O(4) atoms. In the tenth Mg site, Mg(10) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(3), and two equivalent O(5) atoms. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), two equivalent Mg(5), and two equivalent Mg(9) atoms to form OMg5 square pyramids that share  a cornercorner with one O(2)RbMg5 octahedra, corners with two equivalent O(10)CsRbMg4 octahedra, corners with two equivalent O(1)Mg5 square pyramids, corners with two equivalent O(6)Rb2Mg3 trigonal bipyramids, edges with two equivalent O(8)Mg6 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-73°. In the second O site, O(2) is bonded to one Rb(1), one Mg(1), two equivalent Mg(10), and two equivalent Mg(7) atoms to form distorted ORbMg5 octahedra that share corners with two equivalent O(2)RbMg5 octahedra,  a cornercorner with one O(1)Mg5 square pyramid, corners with two equivalent O(3)Mg5 square pyramids, corners with two equivalent O(6)Rb2Mg3 trigonal bipyramids, edges with two equivalent O(10)CsRbMg4 octahedra, edges with two equivalent O(8)Mg6 octahedra, and edges with four equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles are 4°. In the third O site, O(3) is bonded to one Mg(2), two equivalent Mg(10), and two equivalent Mg(8) atoms to form OMg5 square pyramids that share corners with two equivalent O(10)CsRbMg4 octahedra, corners with two equivalent O(2)RbMg5 octahedra, corners with two equivalent O(3)Mg5 square pyramids, corners with two equivalent O(7)Cs2Mg3 trigonal bipyramids, edges with two equivalent O(9)Mg6 octahedra, and edges with four equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 27-80°. In the fourth O site, O(4) is bonded to one Mg(3), one Mg(4), one Mg(5), one Mg(6), and two equivalent Mg(9) atoms to form distorted OMg6 octahedra that share corners with two equivalent O(5)Mg6 octahedra, corners with four equivalent O(4)Mg6 octahedra,  a cornercorner with one O(7)Cs2Mg3 trigonal bipyramid,  an edgeedge with one O(8)Mg6 octahedra,  an edgeedge with one O(9)Mg6 octahedra, edges with two equivalent O(10)CsRbMg4 octahedra, edges with two equivalent O(1)Mg5 square pyramids, and  an edgeedge with one O(6)Rb2Mg3 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 0-27°. In the fifth O site, O(5) is bonded to one Mg(3), one Mg(4), one Mg(7), one Mg(8), and two equivalent Mg(10) atoms to form distorted OMg6 octahedra that share corners with two equivalent O(4)Mg6 octahedra, corners with four equivalent O(5)Mg6 octahedra,  a cornercorner with one O(6)Rb2Mg3 trigonal bipyramid,  an edgeedge with one O(8)Mg6 octahedra,  an edgeedge with one O(9)Mg6 octahedra, edges with two equivalent O(10)CsRbMg4 octahedra, edges with two equivalent O(2)RbMg5 octahedra, edges with two equivalent O(3)Mg5 square pyramids, and  an edgeedge with one O(7)Cs2Mg3 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 0-21°. In the sixth O site, O(6) is bonded to two equivalent Rb(1), one Mg(5), and two equivalent Mg(3) atoms to form distorted ORb2Mg3 trigonal bipyramids that share  a cornercorner with one O(8)Mg6 octahedra, corners with two equivalent O(5)Mg6 octahedra, corners with two equivalent O(2)RbMg5 octahedra, corners with two equivalent O(1)Mg5 square pyramids, corners with two equivalent O(7)Cs2Mg3 trigonal bipyramids, corners with two equivalent O(6)Rb2Mg3 trigonal bipyramids, edges with two equivalent O(4)Mg6 octahedra, and edges with four equivalent O(10)CsRbMg4 octahedra. The corner-sharing octahedral tilt angles range from 0-78°. In the seventh O site, O(7) is bonded to two equivalent Cs(1), one Mg(8), and two equivalent Mg(3) atoms to form distorted OCs2Mg3 trigonal bipyramids that share  a cornercorner with one O(9)Mg6 octahedra, corners with two equivalent O(4)Mg6 octahedra, corners with two equivalent O(3)Mg5 square pyramids, corners with two equivalent O(7)Cs2Mg3 trigonal bipyramids, corners with two equivalent O(6)Rb2Mg3 trigonal bipyramids, edges with two equivalent O(5)Mg6 octahedra, and edges with four equivalent O(10)CsRbMg4 octahedra. The corner-sharing octahedral tilt angles range from 0-86°. In the eighth O site, O(8) is bonded to one Mg(5), one Mg(7), two equivalent Mg(1), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with two equivalent O(8)Mg6 octahedra, corners with two equivalent O(9)Mg6 octahedra,  a cornercorner with one O(6)Rb2Mg3 trigonal bipyramid, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(2)RbMg5 octahedra, and edges with two equivalent O(1)Mg5 square pyramids. The corner-sharing octahedral tilt angles range from 3-5°. In the ninth O site, O(9) is bonded to one Mg(6), one Mg(8), two equivalent Mg(2), and two equivalent Mg(4) atoms to form distorted OMg6 octahedra that share corners with two equivalent O(8)Mg6 octahedra, corners with two equivalent O(9)Mg6 octahedra,  a cornercorner with one O(7)Cs2Mg3 trigonal bipyramid, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with two equivalent O(3)Mg5 square pyramids. The corner-sharing octahedral tilt angles range from 5-14°. In the tenth O site, O(10) is bonded to one Cs(1), one Rb(1), one Mg(10), one Mg(9), and two equivalent Mg(3) atoms to form distorted OCsRbMg4 octahedra that share corners with four equivalent O(10)CsRbMg4 octahedra,  a cornercorner with one O(1)Mg5 square pyramid,  a cornercorner with one O(3)Mg5 square pyramid,  an edgeedge with one O(2)RbMg5 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(7)Cs2Mg3 trigonal bipyramids, and edges with two equivalent O(6)Rb2Mg3 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 12-60°. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Mg(1), one Mg(2), one Mg(9), and two equivalent Mg(4) atoms.
CsRbMg14O15 crystallizes in the orthorhombic Pmm2 space group. Cs(1) is bonded in a 4-coordinate geometry to two equivalent O(10) and two equivalent O(7) atoms. Both Cs(1)-O(10) bond lengths are 2.44 Å. Both Cs(1)-O(7) bond lengths are 2.52 Å. Rb(1) is bonded to one O(2), two equivalent O(10), and two equivalent O(6) atoms to form distorted RbO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Mg(7)O5 square pyramids, corners with two equivalent Rb(1)O5 trigonal bipyramids, and edges with four equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-62°. The Rb(1)-O(2) bond length is 2.47 Å. Both Rb(1)-O(10) bond lengths are 2.40 Å. Both Rb(1)-O(6) bond lengths are 2.40 Å. There are ten inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(1), one O(2), two equivalent O(11), and two equivalent O(8) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra,  a cornercorner with one Rb(1)O5 trigonal bipyramid, corners with two equivalent Mg(2)O5 trigonal bipyramids, edges with two equivalent Mg(5)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with two equivalent Mg(7)O5 square pyramids. The corner-sharing octahedral tilt angles are 3°. The Mg(1)-O(1) bond length is 1.98 Å. The Mg(1)-O(2) bond length is 1.93 Å. Both Mg(1)-O(11) bond lengths are 2.45 Å. Both Mg(1)-O(8) bond lengths are 2.12 Å. In the second Mg site, Mg(2) is bonded to one O(3), two equivalent O(11), and two equivalent O(9) atoms to form MgO5 trigonal bipyramids that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O5 trigonal bipyramids, edges with two equivalent Mg(8)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles are 20°. The Mg(2)-O(3) bond length is 1.95 Å. Both Mg(2)-O(11) bond lengths are 2.11 Å. Both Mg(2)-O(9) bond lengths are 2.14 Å. In the third Mg site, Mg(3) is bonded to one O(4), one O(5), one O(6), one O(7), and two equivalent O(10) atoms to form distorted MgO6 octahedra that share corners with two equivalent Mg(4)O6 octahedra, corners with four equivalent Mg(3)O6 octahedra,  a cornercorner with one Mg(7)O5 square pyramid,  an edgeedge with one Mg(5)O6 octahedra,  an edgeedge with one Mg(8)O6 octahedra, and edges with two equivalent Rb(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 4-26°. The Mg(3)-O(4) bond length is 2.34 Å. The Mg(3)-O(5) bond length is 2.65 Å. The Mg(3)-O(6) bond length is 2.30 Å. The Mg(3)-O(7) bond length is 2.26 Å. Both Mg(3)-O(10) bond lengths are 2.13 Å. In the fourth Mg site, Mg(4) is bonded to one O(4), one O(5), one O(8), one O(9), and two equivalent O(11) atoms to form MgO6 octahedra that share corners with two equivalent Mg(3)O6 octahedra, corners with four equivalent Mg(4)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra,  an edgeedge with one Mg(8)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra,  an edgeedge with one Mg(7)O5 square pyramid, and edges with two equivalent Mg(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-18°. The Mg(4)-O(4) bond length is 2.39 Å. The Mg(4)-O(5) bond length is 2.24 Å. The Mg(4)-O(8) bond length is 2.32 Å. The Mg(4)-O(9) bond length is 2.17 Å. Both Mg(4)-O(11) bond lengths are 2.15 Å. In the fifth Mg site, Mg(5) is bonded to one O(6), one O(8), two equivalent O(1), and two equivalent O(4) atoms to form distorted MgO6 octahedra that share corners with two equivalent Mg(5)O6 octahedra,  a cornercorner with one Mg(7)O5 square pyramid, corners with two equivalent Rb(1)O5 trigonal bipyramids, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, and edges with two equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles are 9°. The Mg(5)-O(6) bond length is 1.91 Å. The Mg(5)-O(8) bond length is 2.10 Å. Both Mg(5)-O(1) bond lengths are 2.13 Å. Both Mg(5)-O(4) bond lengths are 2.45 Å. In the sixth Mg site, Mg(6) is bonded in a 3-coordinate geometry to one O(9) and two equivalent O(4) atoms. The Mg(6)-O(9) bond length is 1.94 Å. Both Mg(6)-O(4) bond lengths are 2.08 Å. In the seventh Mg site, Mg(7) is bonded to one O(8), two equivalent O(2), and two equivalent O(5) atoms to form MgO5 square pyramids that share  a cornercorner with one Mg(5)O6 octahedra, corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Mg(8)O6 octahedra, corners with two equivalent Mg(7)O5 square pyramids, corners with two equivalent Rb(1)O5 trigonal bipyramids, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-79°. The Mg(7)-O(8) bond length is 2.06 Å. Both Mg(7)-O(2) bond lengths are 2.12 Å. Both Mg(7)-O(5) bond lengths are 2.21 Å. In the eighth Mg site, Mg(8) is bonded to one O(7), one O(9), two equivalent O(3), and two equivalent O(5) atoms to form distorted MgO6 octahedra that share corners with two equivalent Mg(8)O6 octahedra, corners with two equivalent Mg(7)O5 square pyramids, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, and edges with two equivalent Mg(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 20°. The Mg(8)-O(7) bond length is 1.97 Å. The Mg(8)-O(9) bond length is 2.58 Å. Both Mg(8)-O(3) bond lengths are 2.15 Å. Both Mg(8)-O(5) bond lengths are 2.31 Å. In the ninth Mg site, Mg(9) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(11), and two equivalent O(4) atoms. The Mg(9)-O(1) bond length is 1.96 Å. The Mg(9)-O(10) bond length is 2.57 Å. The Mg(9)-O(11) bond length is 2.12 Å. Both Mg(9)-O(4) bond lengths are 2.18 Å. In the tenth Mg site, Mg(10) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(3), and two equivalent O(5) atoms. The Mg(10)-O(10) bond length is 2.13 Å. The Mg(10)-O(2) bond length is 2.51 Å. The Mg(10)-O(3) bond length is 2.11 Å. Both Mg(10)-O(5) bond lengths are 2.15 Å. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), two equivalent Mg(5), and two equivalent Mg(9) atoms to form OMg5 square pyramids that share  a cornercorner with one O(2)RbMg5 octahedra, corners with two equivalent O(10)CsRbMg4 octahedra, corners with two equivalent O(1)Mg5 square pyramids, corners with two equivalent O(6)Rb2Mg3 trigonal bipyramids, edges with two equivalent O(8)Mg6 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-73°. In the second O site, O(2) is bonded to one Rb(1), one Mg(1), two equivalent Mg(10), and two equivalent Mg(7) atoms to form distorted ORbMg5 octahedra that share corners with two equivalent O(2)RbMg5 octahedra,  a cornercorner with one O(1)Mg5 square pyramid, corners with two equivalent O(3)Mg5 square pyramids, corners with two equivalent O(6)Rb2Mg3 trigonal bipyramids, edges with two equivalent O(10)CsRbMg4 octahedra, edges with two equivalent O(8)Mg6 octahedra, and edges with four equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles are 4°. In the third O site, O(3) is bonded to one Mg(2), two equivalent Mg(10), and two equivalent Mg(8) atoms to form OMg5 square pyramids that share corners with two equivalent O(10)CsRbMg4 octahedra, corners with two equivalent O(2)RbMg5 octahedra, corners with two equivalent O(3)Mg5 square pyramids, corners with two equivalent O(7)Cs2Mg3 trigonal bipyramids, edges with two equivalent O(9)Mg6 octahedra, and edges with four equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 27-80°. In the fourth O site, O(4) is bonded to one Mg(3), one Mg(4), one Mg(5), one Mg(6), and two equivalent Mg(9) atoms to form distorted OMg6 octahedra that share corners with two equivalent O(5)Mg6 octahedra, corners with four equivalent O(4)Mg6 octahedra,  a cornercorner with one O(7)Cs2Mg3 trigonal bipyramid,  an edgeedge with one O(8)Mg6 octahedra,  an edgeedge with one O(9)Mg6 octahedra, edges with two equivalent O(10)CsRbMg4 octahedra, edges with two equivalent O(1)Mg5 square pyramids, and  an edgeedge with one O(6)Rb2Mg3 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 0-27°. In the fifth O site, O(5) is bonded to one Mg(3), one Mg(4), one Mg(7), one Mg(8), and two equivalent Mg(10) atoms to form distorted OMg6 octahedra that share corners with two equivalent O(4)Mg6 octahedra, corners with four equivalent O(5)Mg6 octahedra,  a cornercorner with one O(6)Rb2Mg3 trigonal bipyramid,  an edgeedge with one O(8)Mg6 octahedra,  an edgeedge with one O(9)Mg6 octahedra, edges with two equivalent O(10)CsRbMg4 octahedra, edges with two equivalent O(2)RbMg5 octahedra, edges with two equivalent O(3)Mg5 square pyramids, and  an edgeedge with one O(7)Cs2Mg3 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 0-21°. In the sixth O site, O(6) is bonded to two equivalent Rb(1), one Mg(5), and two equivalent Mg(3) atoms to form distorted ORb2Mg3 trigonal bipyramids that share  a cornercorner with one O(8)Mg6 octahedra, corners with two equivalent O(5)Mg6 octahedra, corners with two equivalent O(2)RbMg5 octahedra, corners with two equivalent O(1)Mg5 square pyramids, corners with two equivalent O(7)Cs2Mg3 trigonal bipyramids, corners with two equivalent O(6)Rb2Mg3 trigonal bipyramids, edges with two equivalent O(4)Mg6 octahedra, and edges with four equivalent O(10)CsRbMg4 octahedra. The corner-sharing octahedral tilt angles range from 0-78°. In the seventh O site, O(7) is bonded to two equivalent Cs(1), one Mg(8), and two equivalent Mg(3) atoms to form distorted OCs2Mg3 trigonal bipyramids that share  a cornercorner with one O(9)Mg6 octahedra, corners with two equivalent O(4)Mg6 octahedra, corners with two equivalent O(3)Mg5 square pyramids, corners with two equivalent O(7)Cs2Mg3 trigonal bipyramids, corners with two equivalent O(6)Rb2Mg3 trigonal bipyramids, edges with two equivalent O(5)Mg6 octahedra, and edges with four equivalent O(10)CsRbMg4 octahedra. The corner-sharing octahedral tilt angles range from 0-86°. In the eighth O site, O(8) is bonded to one Mg(5), one Mg(7), two equivalent Mg(1), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with two equivalent O(8)Mg6 octahedra, corners with two equivalent O(9)Mg6 octahedra,  a cornercorner with one O(6)Rb2Mg3 trigonal bipyramid, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(2)RbMg5 octahedra, and edges with two equivalent O(1)Mg5 square pyramids. The corner-sharing octahedral tilt angles range from 3-5°. In the ninth O site, O(9) is bonded to one Mg(6), one Mg(8), two equivalent Mg(2), and two equivalent Mg(4) atoms to form distorted OMg6 octahedra that share corners with two equivalent O(8)Mg6 octahedra, corners with two equivalent O(9)Mg6 octahedra,  a cornercorner with one O(7)Cs2Mg3 trigonal bipyramid, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with two equivalent O(3)Mg5 square pyramids. The corner-sharing octahedral tilt angles range from 5-14°. In the tenth O site, O(10) is bonded to one Cs(1), one Rb(1), one Mg(10), one Mg(9), and two equivalent Mg(3) atoms to form distorted OCsRbMg4 octahedra that share corners with four equivalent O(10)CsRbMg4 octahedra,  a cornercorner with one O(1)Mg5 square pyramid,  a cornercorner with one O(3)Mg5 square pyramid,  an edgeedge with one O(2)RbMg5 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(7)Cs2Mg3 trigonal bipyramids, and edges with two equivalent O(6)Rb2Mg3 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 12-60°. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Mg(1), one Mg(2), one Mg(9), and two equivalent Mg(4) atoms.