Sr4MgMn2Ga2O11 crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one Mg(1), one O(3), one O(5), one O(6), one O(7), two equivalent O(1), and two equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 11-coordinate geometry to one O(5), one O(6), one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Mg(1) is bonded in a square co-planar geometry to two equivalent Sr(1), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent Mn(2)O6 octahedra and corners with two equivalent Ga(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 1-28°. In the second Mn site, Mn(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra and corners with two equivalent Ga(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 1-28°. Ga(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(7) atom to form GaO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with three equivalent Ga(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 25°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Mn(1), and one Ga(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Mn(2), and one Ga(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), two equivalent Sr(2), one Mg(1), one Mn(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Sr(2), one Mg(1), one Mn(1), and one Mn(2) atom. In the fifth O site, O(5) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Ga(1) atoms to form distorted face-sharing OSr4Ga2 octahedra. In the sixth O site, O(6) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Ga(1) atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Ga2 octahedra. The corner-sharing octahedral tilt angles are 4°. In the seventh O site, O(7) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Ga(1) atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Ga2 octahedra. The corner-sharing octahedral tilt angles are 4°.
Sr4MgMn2Ga2O11 crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one Mg(1), one O(3), one O(5), one O(6), one O(7), two equivalent O(1), and two equivalent O(2) atoms. The Sr(1)-Mg(1) bond length is 2.70 Å. The Sr(1)-O(3) bond length is 2.82 Å. The Sr(1)-O(5) bond length is 2.48 Å. The Sr(1)-O(6) bond length is 2.46 Å. The Sr(1)-O(7) bond length is 2.47 Å. There is one shorter (2.59 Å) and one longer (3.14 Å) Sr(1)-O(1) bond length. There is one shorter (2.62 Å) and one longer (3.10 Å) Sr(1)-O(2) bond length. In the second Sr site, Sr(2) is bonded in a 11-coordinate geometry to one O(5), one O(6), one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The Sr(2)-O(5) bond length is 2.90 Å. The Sr(2)-O(6) bond length is 2.91 Å. The Sr(2)-O(7) bond length is 2.93 Å. There is one shorter (2.60 Å) and one longer (3.09 Å) Sr(2)-O(1) bond length. There is one shorter (2.60 Å) and one longer (3.09 Å) Sr(2)-O(2) bond length. There is one shorter (2.68 Å) and one longer (3.24 Å) Sr(2)-O(3) bond length. There is one shorter (2.77 Å) and one longer (2.83 Å) Sr(2)-O(4) bond length. Mg(1) is bonded in a square co-planar geometry to two equivalent Sr(1), two equivalent O(3), and two equivalent O(4) atoms. Both Mg(1)-O(3) bond lengths are 1.95 Å. Both Mg(1)-O(4) bond lengths are 1.99 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent Mn(2)O6 octahedra and corners with two equivalent Ga(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 1-28°. Both Mn(1)-O(1) bond lengths are 2.34 Å. Both Mn(1)-O(3) bond lengths are 2.07 Å. Both Mn(1)-O(4) bond lengths are 1.97 Å. In the second Mn site, Mn(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra and corners with two equivalent Ga(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 1-28°. Both Mn(2)-O(2) bond lengths are 2.32 Å. Both Mn(2)-O(3) bond lengths are 1.97 Å. Both Mn(2)-O(4) bond lengths are 2.05 Å. Ga(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(7) atom to form GaO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with three equivalent Ga(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 25°. The Ga(1)-O(1) bond length is 1.95 Å. The Ga(1)-O(2) bond length is 1.96 Å. The Ga(1)-O(5) bond length is 1.89 Å. The Ga(1)-O(6) bond length is 2.02 Å. The Ga(1)-O(7) bond length is 2.01 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Mn(1), and one Ga(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Mn(2), and one Ga(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), two equivalent Sr(2), one Mg(1), one Mn(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Sr(2), one Mg(1), one Mn(1), and one Mn(2) atom. In the fifth O site, O(5) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Ga(1) atoms to form distorted face-sharing OSr4Ga2 octahedra. In the sixth O site, O(6) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Ga(1) atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Ga2 octahedra. The corner-sharing octahedral tilt angles are 4°. In the seventh O site, O(7) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Ga(1) atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Ga2 octahedra. The corner-sharing octahedral tilt angles are 4°.