Sr(Mg3Ge)N4 is Hausmannite-derived structured and crystallizes in the monoclinic Cm space group. Sr(1) is bonded in a distorted body-centered cubic geometry to two equivalent N(1), two equivalent N(2), two equivalent N(3), and two equivalent N(4) atoms. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one N(2), one N(4), and two equivalent N(1) atoms to form MgN4 trigonal pyramids that share corners with three equivalent Mg(3)N4 tetrahedra, corners with two equivalent Mg(1)N4 trigonal pyramids, corners with three equivalent Mg(2)N4 trigonal pyramids, and edges with two equivalent Ge(1)N4 tetrahedra. In the second Mg site, Mg(2) is bonded to one N(2), one N(3), and two equivalent N(4) atoms to form distorted MgN4 trigonal pyramids that share corners with three equivalent Ge(1)N4 tetrahedra, corners with two equivalent Mg(2)N4 trigonal pyramids, corners with three equivalent Mg(1)N4 trigonal pyramids, and edges with two equivalent Mg(3)N4 tetrahedra. In the third Mg site, Mg(3) is bonded to one N(1), one N(4), and two equivalent N(3) atoms to form MgN4 tetrahedra that share corners with two equivalent Mg(3)N4 tetrahedra, corners with three equivalent Ge(1)N4 tetrahedra, corners with three equivalent Mg(1)N4 trigonal pyramids, and edges with two equivalent Mg(2)N4 trigonal pyramids. Ge(1) is bonded to one N(1), one N(3), and two equivalent N(2) atoms to form GeN4 tetrahedra that share corners with two equivalent Ge(1)N4 tetrahedra, corners with three equivalent Mg(3)N4 tetrahedra, corners with three equivalent Mg(2)N4 trigonal pyramids, and edges with two equivalent Mg(1)N4 trigonal pyramids. There are four inequivalent N sites. In the first N site, N(1) is bonded to two equivalent Sr(1), one Mg(3), two equivalent Mg(1), and one Ge(1) atom to form distorted NSr2Mg3Ge octahedra that share corners with four equivalent N(4)Sr2Mg4 octahedra, edges with two equivalent N(1)Sr2Mg3Ge octahedra, and  a faceface with one N(4)Sr2Mg4 octahedra. The corner-sharing octahedral tilt angles range from 54-65°. In the second N site, N(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Mg(1), one Mg(2), and two equivalent Ge(1) atoms. In the third N site, N(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), one Mg(2), two equivalent Mg(3), and one Ge(1) atom. In the fourth N site, N(4) is bonded to two equivalent Sr(1), one Mg(1), one Mg(3), and two equivalent Mg(2) atoms to form distorted NSr2Mg4 octahedra that share corners with four equivalent N(1)Sr2Mg3Ge octahedra, edges with two equivalent N(4)Sr2Mg4 octahedra, and  a faceface with one N(1)Sr2Mg3Ge octahedra. The corner-sharing octahedral tilt angles range from 54-65°.
Sr(Mg3Ge)N4 is Hausmannite-derived structured and crystallizes in the monoclinic Cm space group. Sr(1) is bonded in a distorted body-centered cubic geometry to two equivalent N(1), two equivalent N(2), two equivalent N(3), and two equivalent N(4) atoms. Both Sr(1)-N(1) bond lengths are 2.81 Å. Both Sr(1)-N(2) bond lengths are 3.07 Å. Both Sr(1)-N(3) bond lengths are 2.98 Å. Both Sr(1)-N(4) bond lengths are 2.70 Å. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one N(2), one N(4), and two equivalent N(1) atoms to form MgN4 trigonal pyramids that share corners with three equivalent Mg(3)N4 tetrahedra, corners with two equivalent Mg(1)N4 trigonal pyramids, corners with three equivalent Mg(2)N4 trigonal pyramids, and edges with two equivalent Ge(1)N4 tetrahedra. The Mg(1)-N(2) bond length is 2.26 Å. The Mg(1)-N(4) bond length is 2.03 Å. Both Mg(1)-N(1) bond lengths are 2.09 Å. In the second Mg site, Mg(2) is bonded to one N(2), one N(3), and two equivalent N(4) atoms to form distorted MgN4 trigonal pyramids that share corners with three equivalent Ge(1)N4 tetrahedra, corners with two equivalent Mg(2)N4 trigonal pyramids, corners with three equivalent Mg(1)N4 trigonal pyramids, and edges with two equivalent Mg(3)N4 tetrahedra. The Mg(2)-N(2) bond length is 2.10 Å. The Mg(2)-N(3) bond length is 2.33 Å. Both Mg(2)-N(4) bond lengths are 2.07 Å. In the third Mg site, Mg(3) is bonded to one N(1), one N(4), and two equivalent N(3) atoms to form MgN4 tetrahedra that share corners with two equivalent Mg(3)N4 tetrahedra, corners with three equivalent Ge(1)N4 tetrahedra, corners with three equivalent Mg(1)N4 trigonal pyramids, and edges with two equivalent Mg(2)N4 trigonal pyramids. The Mg(3)-N(1) bond length is 2.09 Å. The Mg(3)-N(4) bond length is 2.12 Å. Both Mg(3)-N(3) bond lengths are 2.09 Å. Ge(1) is bonded to one N(1), one N(3), and two equivalent N(2) atoms to form GeN4 tetrahedra that share corners with two equivalent Ge(1)N4 tetrahedra, corners with three equivalent Mg(3)N4 tetrahedra, corners with three equivalent Mg(2)N4 trigonal pyramids, and edges with two equivalent Mg(1)N4 trigonal pyramids. The Ge(1)-N(1) bond length is 1.90 Å. The Ge(1)-N(3) bond length is 1.83 Å. Both Ge(1)-N(2) bond lengths are 2.02 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded to two equivalent Sr(1), one Mg(3), two equivalent Mg(1), and one Ge(1) atom to form distorted NSr2Mg3Ge octahedra that share corners with four equivalent N(4)Sr2Mg4 octahedra, edges with two equivalent N(1)Sr2Mg3Ge octahedra, and  a faceface with one N(4)Sr2Mg4 octahedra. The corner-sharing octahedral tilt angles range from 54-65°. In the second N site, N(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Mg(1), one Mg(2), and two equivalent Ge(1) atoms. In the third N site, N(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), one Mg(2), two equivalent Mg(3), and one Ge(1) atom. In the fourth N site, N(4) is bonded to two equivalent Sr(1), one Mg(1), one Mg(3), and two equivalent Mg(2) atoms to form distorted NSr2Mg4 octahedra that share corners with four equivalent N(1)Sr2Mg3Ge octahedra, edges with two equivalent N(4)Sr2Mg4 octahedra, and  a faceface with one N(1)Sr2Mg3Ge octahedra. The corner-sharing octahedral tilt angles range from 54-65°.