SrMg14AlO16 is Caswellsilverite-derived structured and crystallizes in the tetragonal P4/mmm space group. Sr(1) is bonded to two equivalent O(6) and four O(2,2) atoms to form SrO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedra are not tilted. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) 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 Al(1)O6 octahedra, edges with four equivalent Mg(2)O6 octahedra, edges with four equivalent Mg(3)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedra are not tilted. In the second Mg site, Mg(2) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(3)O6 octahedra, corners with four equivalent Mg(2)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Al(1)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the third Mg site, Mg(3) is bonded to one O(5), one O(6), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with four equivalent Mg(3)O6 octahedra, edges with two equivalent Sr(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-7°. In the fourth Mg site, Mg(4) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with six equivalent Mg(4)O6 octahedra,  an edgeedge with one Sr(1)O6 octahedra,  an edgeedge with one Al(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with four equivalent Mg(2)O6 octahedra, and edges with four equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-9°. Al(1) is bonded to two equivalent O(4) and four equivalent O(1) atoms to form AlO6 octahedra that share corners with two equivalent Al(1)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with eight equivalent Mg(2)O6 octahedra. The corner-sharing octahedra are not tilted. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), two equivalent Mg(2), two equivalent Mg(4), and one Al(1) atom to form OMg5Al octahedra that share corners with two equivalent O(2)SrMg5 octahedra; corners with four equivalent O(1)Mg5Al octahedra; edges with two equivalent O(4)Mg4Al2 octahedra; edges with two equivalent O(1)Mg5Al octahedra; edges with two equivalent O(5)Mg6 octahedra; edges with two O(2,2)SrMg5 octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the second O site, O(2) is bonded to one Sr(1), one Mg(1), two equivalent Mg(3), and two equivalent Mg(4) atoms to form OSrMg5 octahedra that share corners with two equivalent O(1)Mg5Al octahedra; corners with four equivalent O(2)SrMg5 octahedra; edges with two equivalent O(1)Mg5Al octahedra; edges with two equivalent O(5)Mg6 octahedra; edges with two equivalent O(6)Sr2Mg4 octahedra; edges with two O(2,2)SrMg5 octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-9°. In the third O site, O(3) is bonded to two equivalent Mg(2), two equivalent Mg(3), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with six equivalent O(3)Mg6 octahedra,  an edgeedge with one O(4)Mg4Al2 octahedra,  an edgeedge with one O(6)Sr2Mg4 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with four equivalent O(1)Mg5Al octahedra, and edges with four equivalent O(2)SrMg5 octahedra. The corner-sharing octahedral tilt angles range from 1-4°. In the fourth O site, O(4) is bonded to four equivalent Mg(2) and two equivalent Al(1) atoms to form OMg4Al2 octahedra that share corners with two equivalent O(4)Mg4Al2 octahedra, corners with four equivalent O(5)Mg6 octahedra, edges with four equivalent O(3)Mg6 octahedra, and edges with eight equivalent O(1)Mg5Al octahedra. The corner-sharing octahedra are not tilted. In the fifth O site, O(5) is bonded to two equivalent Mg(1), two equivalent Mg(2), and two equivalent Mg(3) atoms to form OMg6 octahedra that share corners with two equivalent O(4)Mg4Al2 octahedra, corners with two equivalent O(5)Mg6 octahedra, corners with two equivalent O(6)Sr2Mg4 octahedra, edges with four equivalent O(1)Mg5Al octahedra, edges with four equivalent O(3)Mg6 octahedra, and edges with four equivalent O(2)SrMg5 octahedra. The corner-sharing octahedra are not tilted. In the sixth O site, O(6) is bonded to two equivalent Sr(1) and four equivalent Mg(3) atoms to form OSr2Mg4 octahedra that share corners with two equivalent O(6)Sr2Mg4 octahedra; corners with four equivalent O(5)Mg6 octahedra; edges with four equivalent O(3)Mg6 octahedra; and edges with eight O(2,2)SrMg5 octahedra. The corner-sharing octahedra are not tilted. In the seventh O site, O(2) is bonded to one Sr(1), one Mg(1), two equivalent Mg(3), and two equivalent Mg(4) atoms to form OSrMg5 octahedra that share corners with two equivalent O(1)Mg5Al octahedra; corners with four O(2,2)SrMg5 octahedra; edges with two equivalent O(1)Mg5Al octahedra; edges with two equivalent O(5)Mg6 octahedra; edges with two equivalent O(6)Sr2Mg4 octahedra; edges with two equivalent O(2)SrMg5 octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-9°.
SrMg14AlO16 is Caswellsilverite-derived structured and crystallizes in the tetragonal P4/mmm space group. Sr(1) is bonded to two equivalent O(6) and four O(2,2) atoms to form SrO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedra are not tilted. Both Sr(1)-O(6) bond lengths are 2.22 Å. All Sr(1)-O(2,2) bond lengths are 2.37 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) 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 Al(1)O6 octahedra, edges with four equivalent Mg(2)O6 octahedra, edges with four equivalent Mg(3)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedra are not tilted. Both Mg(1)-O(1) bond lengths are 2.37 Å. Both Mg(1)-O(2) bond lengths are 1.96 Å. Both Mg(1)-O(5) bond lengths are 2.22 Å. In the second Mg site, Mg(2) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(3)O6 octahedra, corners with four equivalent Mg(2)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Al(1)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. The Mg(2)-O(4) bond length is 2.15 Å. The Mg(2)-O(5) bond length is 2.18 Å. Both Mg(2)-O(1) bond lengths are 2.23 Å. Both Mg(2)-O(3) bond lengths are 2.16 Å. In the third Mg site, Mg(3) is bonded to one O(5), one O(6), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with four equivalent Mg(3)O6 octahedra, edges with two equivalent Sr(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-7°. The Mg(3)-O(5) bond length is 2.09 Å. The Mg(3)-O(6) bond length is 2.24 Å. Both Mg(3)-O(2) bond lengths are 2.22 Å. Both Mg(3)-O(3) bond lengths are 2.17 Å. In the fourth Mg site, Mg(4) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with six equivalent Mg(4)O6 octahedra,  an edgeedge with one Sr(1)O6 octahedra,  an edgeedge with one Al(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with four equivalent Mg(2)O6 octahedra, and edges with four equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-9°. Both Mg(4)-O(1) bond lengths are 2.13 Å. Both Mg(4)-O(2) bond lengths are 2.21 Å. Both Mg(4)-O(3) bond lengths are 2.22 Å. Al(1) is bonded to two equivalent O(4) and four equivalent O(1) atoms to form AlO6 octahedra that share corners with two equivalent Al(1)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with eight equivalent Mg(2)O6 octahedra. The corner-sharing octahedra are not tilted. Both Al(1)-O(4) bond lengths are 2.22 Å. All Al(1)-O(1) bond lengths are 1.96 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), two equivalent Mg(2), two equivalent Mg(4), and one Al(1) atom to form OMg5Al octahedra that share corners with two equivalent O(2)SrMg5 octahedra; corners with four equivalent O(1)Mg5Al octahedra; edges with two equivalent O(4)Mg4Al2 octahedra; edges with two equivalent O(1)Mg5Al octahedra; edges with two equivalent O(5)Mg6 octahedra; edges with two O(2,2)SrMg5 octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the second O site, O(2) is bonded to one Sr(1), one Mg(1), two equivalent Mg(3), and two equivalent Mg(4) atoms to form OSrMg5 octahedra that share corners with two equivalent O(1)Mg5Al octahedra; corners with four equivalent O(2)SrMg5 octahedra; edges with two equivalent O(1)Mg5Al octahedra; edges with two equivalent O(5)Mg6 octahedra; edges with two equivalent O(6)Sr2Mg4 octahedra; edges with two O(2,2)SrMg5 octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-9°. In the third O site, O(3) is bonded to two equivalent Mg(2), two equivalent Mg(3), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with six equivalent O(3)Mg6 octahedra,  an edgeedge with one O(4)Mg4Al2 octahedra,  an edgeedge with one O(6)Sr2Mg4 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with four equivalent O(1)Mg5Al octahedra, and edges with four equivalent O(2)SrMg5 octahedra. The corner-sharing octahedral tilt angles range from 1-4°. In the fourth O site, O(4) is bonded to four equivalent Mg(2) and two equivalent Al(1) atoms to form OMg4Al2 octahedra that share corners with two equivalent O(4)Mg4Al2 octahedra, corners with four equivalent O(5)Mg6 octahedra, edges with four equivalent O(3)Mg6 octahedra, and edges with eight equivalent O(1)Mg5Al octahedra. The corner-sharing octahedra are not tilted. In the fifth O site, O(5) is bonded to two equivalent Mg(1), two equivalent Mg(2), and two equivalent Mg(3) atoms to form OMg6 octahedra that share corners with two equivalent O(4)Mg4Al2 octahedra, corners with two equivalent O(5)Mg6 octahedra, corners with two equivalent O(6)Sr2Mg4 octahedra, edges with four equivalent O(1)Mg5Al octahedra, edges with four equivalent O(3)Mg6 octahedra, and edges with four equivalent O(2)SrMg5 octahedra. The corner-sharing octahedra are not tilted. In the sixth O site, O(6) is bonded to two equivalent Sr(1) and four equivalent Mg(3) atoms to form OSr2Mg4 octahedra that share corners with two equivalent O(6)Sr2Mg4 octahedra; corners with four equivalent O(5)Mg6 octahedra; edges with four equivalent O(3)Mg6 octahedra; and edges with eight O(2,2)SrMg5 octahedra. The corner-sharing octahedra are not tilted. In the seventh O site, O(2) is bonded to one Sr(1), one Mg(1), two equivalent Mg(3), and two equivalent Mg(4) atoms to form OSrMg5 octahedra that share corners with two equivalent O(1)Mg5Al octahedra; corners with four O(2,2)SrMg5 octahedra; edges with two equivalent O(1)Mg5Al octahedra; edges with two equivalent O(5)Mg6 octahedra; edges with two equivalent O(6)Sr2Mg4 octahedra; edges with two equivalent O(2)SrMg5 octahedra; and edges with four equivalent O(3)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-9°. The O(2)-Mg(1) bond length is 1.96 Å. Both O(2)-Mg(3) bond lengths are 2.22 Å. Both O(2)-Mg(4) bond lengths are 2.21 Å.