RbNaMg14O15 crystallizes in the orthorhombic Pmm2 space group. Rb(1) is bonded in a 4-coordinate geometry to two equivalent O(10) and two equivalent O(7) atoms. Na(1) is bonded to one O(1), one O(2), two equivalent O(10), and two equivalent O(6) atoms to form NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, edges with two equivalent Mg(7)O6 octahedra, edges with four equivalent Mg(3)O6 octahedra, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-6°. 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 Na(1)O6 octahedra, corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O5 square pyramids, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, edges with two equivalent Mg(7)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-4°. 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 distorted MgO5 square pyramids that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O5 square pyramids, corners with two equivalent Mg(9)O5 square pyramids, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(8)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. 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 MgO6 octahedra that share corners with two equivalent Mg(4)O6 octahedra, corners with four equivalent Mg(3)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra,  an edgeedge with one Mg(7)O6 octahedra,  an edgeedge with one Mg(8)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Mg(10)O6 octahedra, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 2-6°. 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(7)O6 octahedra,  an edgeedge with one Mg(8)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(2)O5 square pyramids, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 2-10°. 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 MgO6 octahedra that share corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Mg(7)O6 octahedra, edges with two equivalent Na(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(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-10°. In the sixth Mg site, Mg(6) is bonded in a distorted square co-planar geometry to one O(7), one O(9), and two equivalent O(4) atoms. In the seventh Mg site, Mg(7) is bonded to one O(6), one O(8), two equivalent O(2), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Mg(7)O6 octahedra, corners with two equivalent Mg(8)O6 octahedra, edges with two equivalent Na(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(10)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. 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 MgO6 octahedra that share corners with two equivalent Mg(7)O6 octahedra, corners with two equivalent Mg(8)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with four equivalent Mg(10)O6 octahedra, and edges with two equivalent Mg(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 6-9°. In the ninth Mg site, Mg(9) is bonded to one O(1), one O(10), one O(11), and two equivalent O(4) atoms to form distorted MgO5 square pyramids that share corners with two equivalent Mg(10)O6 octahedra,  a cornercorner with one Mg(2)O5 square pyramid, corners with three equivalent Mg(9)O5 square pyramids,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, and edges with two equivalent Mg(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-15°. In the tenth Mg site, Mg(10) is bonded to one O(10), one O(11), one O(2), one O(3), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with four equivalent Mg(10)O6 octahedra, corners with two equivalent Mg(9)O5 square pyramids,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Mg(7)O6 octahedra, edges with two equivalent Mg(8)O6 octahedra, and  an edgeedge with one Mg(2)O5 square pyramid. The corner-sharing octahedral tilt angles range from 6-14°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Mg(1), two equivalent Mg(5), and two equivalent Mg(9) atoms to form ONaMg5 octahedra that share corners with two equivalent O(1)NaMg5 octahedra, corners with two equivalent O(2)NaMg5 octahedra, edges with two equivalent O(11)Mg6 octahedra, edges with two equivalent O(8)Mg6 octahedra, edges with two equivalent O(6)Na2Mg4 octahedra, edges with two equivalent O(10)RbNaMg4 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the second O site, O(2) is bonded to one Na(1), one Mg(1), two equivalent Mg(10), and two equivalent Mg(7) atoms to form ONaMg5 octahedra that share corners with two equivalent O(1)NaMg5 octahedra, corners with two equivalent O(2)NaMg5 octahedra, corners with two equivalent O(3)Mg5 square pyramids, edges with two equivalent O(11)Mg6 octahedra, edges with two equivalent O(8)Mg6 octahedra, edges with two equivalent O(6)Na2Mg4 octahedra, edges with two equivalent O(10)RbNaMg4 octahedra, and edges with four equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. 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 distorted OMg5 square pyramids that share corners with two equivalent O(2)NaMg5 octahedra, corners with two equivalent O(7)Rb2Mg4 octahedra, corners with two equivalent O(10)RbNaMg4 octahedra, corners with two equivalent O(3)Mg5 square pyramids, edges with two equivalent O(11)Mg6 octahedra, 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 10-86°. 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 OMg6 octahedra that share corners with two equivalent O(5)Mg6 octahedra, corners with four equivalent O(4)Mg6 octahedra,  an edgeedge with one O(8)Mg6 octahedra,  an edgeedge with one O(9)Mg6 octahedra,  an edgeedge with one O(6)Na2Mg4 octahedra,  an edgeedge with one O(7)Rb2Mg4 octahedra, edges with two equivalent O(11)Mg6 octahedra, edges with two equivalent O(1)NaMg5 octahedra, and edges with two equivalent O(10)RbNaMg4 octahedra. The corner-sharing octahedral tilt angles range from 1-20°. 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 OMg6 octahedra that share corners with two equivalent O(4)Mg6 octahedra, corners with four equivalent O(5)Mg6 octahedra,  an edgeedge with one O(8)Mg6 octahedra,  an edgeedge with one O(9)Mg6 octahedra,  an edgeedge with one O(6)Na2Mg4 octahedra,  an edgeedge with one O(7)Rb2Mg4 octahedra, edges with two equivalent O(11)Mg6 octahedra, edges with two equivalent O(2)NaMg5 octahedra, edges with two equivalent O(10)RbNaMg4 octahedra, and edges with two equivalent O(3)Mg5 square pyramids. The corner-sharing octahedral tilt angles range from 2-10°. In the sixth O site, O(6) is bonded to two equivalent Na(1), one Mg(5), one Mg(7), and two equivalent Mg(3) atoms to form ONa2Mg4 octahedra that share corners with two equivalent O(8)Mg6 octahedra, corners with two equivalent O(6)Na2Mg4 octahedra, corners with two equivalent O(7)Rb2Mg4 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(1)NaMg5 octahedra, edges with two equivalent O(2)NaMg5 octahedra, and edges with four equivalent O(10)RbNaMg4 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the seventh O site, O(7) is bonded to two equivalent Rb(1), one Mg(6), one Mg(8), and two equivalent Mg(3) atoms to form ORb2Mg4 octahedra that share corners with two equivalent O(9)Mg6 octahedra, corners with two equivalent O(6)Na2Mg4 octahedra, corners with two equivalent O(7)Rb2Mg4 octahedra, corners with two equivalent O(3)Mg5 square pyramids, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with four equivalent O(10)RbNaMg4 octahedra. The corner-sharing octahedral tilt angles range from 0-42°. 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, corners with two equivalent O(6)Na2Mg4 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(1)NaMg5 octahedra, edges with two equivalent O(2)NaMg5 octahedra, and edges with four equivalent O(11)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-4°. 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 OMg6 octahedra that share corners with two equivalent O(8)Mg6 octahedra, corners with two equivalent O(9)Mg6 octahedra, corners with two equivalent O(7)Rb2Mg4 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with four equivalent O(11)Mg6 octahedra, and edges with two equivalent O(3)Mg5 square pyramids. The corner-sharing octahedral tilt angles range from 0-16°. In the tenth O site, O(10) is bonded to one Rb(1), one Na(1), one Mg(10), one Mg(9), and two equivalent Mg(3) atoms to form ORbNaMg4 octahedra that share corners with two equivalent O(11)Mg6 octahedra, corners with four equivalent O(10)RbNaMg4 octahedra,  a cornercorner with one O(3)Mg5 square pyramid,  an edgeedge with one O(1)NaMg5 octahedra,  an edgeedge with one O(2)NaMg5 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(6)Na2Mg4 octahedra, and edges with two equivalent O(7)Rb2Mg4 octahedra. The corner-sharing octahedral tilt angles range from 0-41°. In the eleventh O site, O(11) is bonded to one Mg(1), one Mg(10), one Mg(2), one Mg(9), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with two equivalent O(10)RbNaMg4 octahedra, corners with four equivalent O(11)Mg6 octahedra,  an edgeedge with one O(1)NaMg5 octahedra,  an edgeedge with one O(2)NaMg5 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(8)Mg6 octahedra, edges with two equivalent O(9)Mg6 octahedra, and  an edgeedge with one O(3)Mg5 square pyramid. The corner-sharing octahedral tilt angles range from 0-19°.
RbNaMg14O15 crystallizes in the orthorhombic Pmm2 space group. Rb(1) is bonded in a 4-coordinate geometry to two equivalent O(10) and two equivalent O(7) atoms. Both Rb(1)-O(10) bond lengths are 2.43 Å. Both Rb(1)-O(7) bond lengths are 2.36 Å. Na(1) is bonded to one O(1), one O(2), two equivalent O(10), and two equivalent O(6) atoms to form NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, edges with two equivalent Mg(7)O6 octahedra, edges with four equivalent Mg(3)O6 octahedra, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-6°. The Na(1)-O(1) bond length is 2.36 Å. The Na(1)-O(2) bond length is 2.21 Å. Both Na(1)-O(10) bond lengths are 2.15 Å. Both Na(1)-O(6) bond lengths are 2.21 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 Na(1)O6 octahedra, corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O5 square pyramids, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, edges with two equivalent Mg(7)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-4°. The Mg(1)-O(1) bond length is 2.00 Å. The Mg(1)-O(2) bond length is 1.93 Å. Both Mg(1)-O(11) bond lengths are 2.37 Å. Both Mg(1)-O(8) bond lengths are 2.20 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 distorted MgO5 square pyramids that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O5 square pyramids, corners with two equivalent Mg(9)O5 square pyramids, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(8)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. The Mg(2)-O(3) bond length is 1.91 Å. Both Mg(2)-O(11) bond lengths are 2.09 Å. Both Mg(2)-O(9) bond lengths are 2.22 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 MgO6 octahedra that share corners with two equivalent Mg(4)O6 octahedra, corners with four equivalent Mg(3)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra,  an edgeedge with one Mg(7)O6 octahedra,  an edgeedge with one Mg(8)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Mg(10)O6 octahedra, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 2-6°. The Mg(3)-O(4) bond length is 2.15 Å. The Mg(3)-O(5) bond length is 2.12 Å. The Mg(3)-O(6) bond length is 2.14 Å. The Mg(3)-O(7) bond length is 2.28 Å. Both Mg(3)-O(10) bond lengths are 2.20 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(7)O6 octahedra,  an edgeedge with one Mg(8)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(2)O5 square pyramids, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 2-10°. The Mg(4)-O(4) bond length is 2.14 Å. The Mg(4)-O(5) bond length is 2.10 Å. The Mg(4)-O(8) bond length is 2.23 Å. The Mg(4)-O(9) bond length is 2.19 Å. Both Mg(4)-O(11) bond lengths are 2.21 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 MgO6 octahedra that share corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Mg(7)O6 octahedra, edges with two equivalent Na(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(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-10°. The Mg(5)-O(6) bond length is 2.05 Å. The Mg(5)-O(8) bond length is 2.11 Å. Both Mg(5)-O(1) bond lengths are 2.21 Å. Both Mg(5)-O(4) bond lengths are 2.31 Å. In the sixth Mg site, Mg(6) is bonded in a distorted square co-planar geometry to one O(7), one O(9), and two equivalent O(4) atoms. The Mg(6)-O(7) bond length is 2.13 Å. The Mg(6)-O(9) bond length is 1.99 Å. Both Mg(6)-O(4) bond lengths are 2.12 Å. In the seventh Mg site, Mg(7) is bonded to one O(6), one O(8), two equivalent O(2), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Mg(7)O6 octahedra, corners with two equivalent Mg(8)O6 octahedra, edges with two equivalent Na(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(10)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. The Mg(7)-O(6) bond length is 2.14 Å. The Mg(7)-O(8) bond length is 2.20 Å. Both Mg(7)-O(2) bond lengths are 2.21 Å. Both Mg(7)-O(5) bond lengths are 2.23 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 MgO6 octahedra that share corners with two equivalent Mg(7)O6 octahedra, corners with two equivalent Mg(8)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with four equivalent Mg(10)O6 octahedra, and edges with two equivalent Mg(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 6-9°. The Mg(8)-O(7) bond length is 1.99 Å. The Mg(8)-O(9) bond length is 2.39 Å. Both Mg(8)-O(3) bond lengths are 2.21 Å. Both Mg(8)-O(5) bond lengths are 2.20 Å. In the ninth Mg site, Mg(9) is bonded to one O(1), one O(10), one O(11), and two equivalent O(4) atoms to form distorted MgO5 square pyramids that share corners with two equivalent Mg(10)O6 octahedra,  a cornercorner with one Mg(2)O5 square pyramid, corners with three equivalent Mg(9)O5 square pyramids,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, and edges with two equivalent Mg(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-15°. The Mg(9)-O(1) bond length is 1.93 Å. The Mg(9)-O(10) bond length is 2.05 Å. The Mg(9)-O(11) bond length is 2.08 Å. Both Mg(9)-O(4) bond lengths are 2.24 Å. In the tenth Mg site, Mg(10) is bonded to one O(10), one O(11), one O(2), one O(3), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with four equivalent Mg(10)O6 octahedra, corners with two equivalent Mg(9)O5 square pyramids,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Mg(7)O6 octahedra, edges with two equivalent Mg(8)O6 octahedra, and  an edgeedge with one Mg(2)O5 square pyramid. The corner-sharing octahedral tilt angles range from 6-14°. The Mg(10)-O(10) bond length is 2.04 Å. The Mg(10)-O(11) bond length is 2.39 Å. The Mg(10)-O(2) bond length is 2.26 Å. The Mg(10)-O(3) bond length is 2.18 Å. Both Mg(10)-O(5) bond lengths are 2.21 Å. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Mg(1), two equivalent Mg(5), and two equivalent Mg(9) atoms to form ONaMg5 octahedra that share corners with two equivalent O(1)NaMg5 octahedra, corners with two equivalent O(2)NaMg5 octahedra, edges with two equivalent O(11)Mg6 octahedra, edges with two equivalent O(8)Mg6 octahedra, edges with two equivalent O(6)Na2Mg4 octahedra, edges with two equivalent O(10)RbNaMg4 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the second O site, O(2) is bonded to one Na(1), one Mg(1), two equivalent Mg(10), and two equivalent Mg(7) atoms to form ONaMg5 octahedra that share corners with two equivalent O(1)NaMg5 octahedra, corners with two equivalent O(2)NaMg5 octahedra, corners with two equivalent O(3)Mg5 square pyramids, edges with two equivalent O(11)Mg6 octahedra, edges with two equivalent O(8)Mg6 octahedra, edges with two equivalent O(6)Na2Mg4 octahedra, edges with two equivalent O(10)RbNaMg4 octahedra, and edges with four equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. 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 distorted OMg5 square pyramids that share corners with two equivalent O(2)NaMg5 octahedra, corners with two equivalent O(7)Rb2Mg4 octahedra, corners with two equivalent O(10)RbNaMg4 octahedra, corners with two equivalent O(3)Mg5 square pyramids, edges with two equivalent O(11)Mg6 octahedra, 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 10-86°. 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 OMg6 octahedra that share corners with two equivalent O(5)Mg6 octahedra, corners with four equivalent O(4)Mg6 octahedra,  an edgeedge with one O(8)Mg6 octahedra,  an edgeedge with one O(9)Mg6 octahedra,  an edgeedge with one O(6)Na2Mg4 octahedra,  an edgeedge with one O(7)Rb2Mg4 octahedra, edges with two equivalent O(11)Mg6 octahedra, edges with two equivalent O(1)NaMg5 octahedra, and edges with two equivalent O(10)RbNaMg4 octahedra. The corner-sharing octahedral tilt angles range from 1-20°. 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 OMg6 octahedra that share corners with two equivalent O(4)Mg6 octahedra, corners with four equivalent O(5)Mg6 octahedra,  an edgeedge with one O(8)Mg6 octahedra,  an edgeedge with one O(9)Mg6 octahedra,  an edgeedge with one O(6)Na2Mg4 octahedra,  an edgeedge with one O(7)Rb2Mg4 octahedra, edges with two equivalent O(11)Mg6 octahedra, edges with two equivalent O(2)NaMg5 octahedra, edges with two equivalent O(10)RbNaMg4 octahedra, and edges with two equivalent O(3)Mg5 square pyramids. The corner-sharing octahedral tilt angles range from 2-10°. In the sixth O site, O(6) is bonded to two equivalent Na(1), one Mg(5), one Mg(7), and two equivalent Mg(3) atoms to form ONa2Mg4 octahedra that share corners with two equivalent O(8)Mg6 octahedra, corners with two equivalent O(6)Na2Mg4 octahedra, corners with two equivalent O(7)Rb2Mg4 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(1)NaMg5 octahedra, edges with two equivalent O(2)NaMg5 octahedra, and edges with four equivalent O(10)RbNaMg4 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the seventh O site, O(7) is bonded to two equivalent Rb(1), one Mg(6), one Mg(8), and two equivalent Mg(3) atoms to form ORb2Mg4 octahedra that share corners with two equivalent O(9)Mg6 octahedra, corners with two equivalent O(6)Na2Mg4 octahedra, corners with two equivalent O(7)Rb2Mg4 octahedra, corners with two equivalent O(3)Mg5 square pyramids, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with four equivalent O(10)RbNaMg4 octahedra. The corner-sharing octahedral tilt angles range from 0-42°. 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, corners with two equivalent O(6)Na2Mg4 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(1)NaMg5 octahedra, edges with two equivalent O(2)NaMg5 octahedra, and edges with four equivalent O(11)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-4°. 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 OMg6 octahedra that share corners with two equivalent O(8)Mg6 octahedra, corners with two equivalent O(9)Mg6 octahedra, corners with two equivalent O(7)Rb2Mg4 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with four equivalent O(11)Mg6 octahedra, and edges with two equivalent O(3)Mg5 square pyramids. The corner-sharing octahedral tilt angles range from 0-16°. In the tenth O site, O(10) is bonded to one Rb(1), one Na(1), one Mg(10), one Mg(9), and two equivalent Mg(3) atoms to form ORbNaMg4 octahedra that share corners with two equivalent O(11)Mg6 octahedra, corners with four equivalent O(10)RbNaMg4 octahedra,  a cornercorner with one O(3)Mg5 square pyramid,  an edgeedge with one O(1)NaMg5 octahedra,  an edgeedge with one O(2)NaMg5 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(6)Na2Mg4 octahedra, and edges with two equivalent O(7)Rb2Mg4 octahedra. The corner-sharing octahedral tilt angles range from 0-41°. In the eleventh O site, O(11) is bonded to one Mg(1), one Mg(10), one Mg(2), one Mg(9), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with two equivalent O(10)RbNaMg4 octahedra, corners with four equivalent O(11)Mg6 octahedra,  an edgeedge with one O(1)NaMg5 octahedra,  an edgeedge with one O(2)NaMg5 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(8)Mg6 octahedra, edges with two equivalent O(9)Mg6 octahedra, and  an edgeedge with one O(3)Mg5 square pyramid. The corner-sharing octahedral tilt angles range from 0-19°.