Sr4MgMn2Ga2O11 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(2), one O(6), one O(8), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(2), one O(5), one O(6), one O(8), and one O(9) atom. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(10), one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(3), one O(5), one O(6), one O(7), and two equivalent O(4) atoms. Mg(1) is bonded to one O(1), one O(11), one O(2), one O(5), and one O(8) atom to form MgO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Ga(2)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(2)O5 trigonal bipyramid, and  an edgeedge with one Ga(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 24°. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form MnO6 octahedra that share  a cornercorner with one Ga(2)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one Ga(1)O5 trigonal bipyramid, corners with three equivalent Mn(2)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. In the second Mn site, Mn(2) is bonded to one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form MnO5 trigonal bipyramids that share corners with three equivalent Mn(1)O6 octahedra,  a cornercorner with one Ga(2)O4 tetrahedra,  a cornercorner with one Ga(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 10-38°. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(10), one O(11), one O(2), one O(3), and one O(9) atom to form distorted GaO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Ga(2)O4 tetrahedra,  a cornercorner with one Mn(2)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 26°. In the second Ga site, Ga(2) is bonded to one O(1), one O(10), one O(4), and one O(9) atom to form GaO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one Mn(2)O5 trigonal bipyramid, and corners with two equivalent Ga(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 40°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(2), one Mg(1), one Mn(1), and one Ga(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), one Mn(2), and one Ga(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one Mn(1), and one Ga(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(3), two equivalent Sr(4), one Mn(2), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Mg(1), one Mn(1), and one Mn(2) atom. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(2), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr3Mn2 trigonal bipyramids that share  a cornercorner with one O(8)Sr3MgMn trigonal bipyramid,  an edgeedge with one O(9)Sr3Ga2 trigonal bipyramid, and  an edgeedge with one O(8)Sr3MgMn trigonal bipyramid. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom. In the eighth O site, O(8) is bonded to one Sr(1), one Sr(2), one Sr(3), one Mg(1), and one Mn(1) atom to form distorted OSr3MgMn trigonal bipyramids that share  a cornercorner with one O(6)Sr3Mn2 trigonal bipyramid, corners with three equivalent O(9)Sr3Ga2 trigonal bipyramids, and  an edgeedge with one O(6)Sr3Mn2 trigonal bipyramid. In the ninth O site, O(9) is bonded to one Sr(1), one Sr(2), one Sr(3), one Ga(1), and one Ga(2) atom to form distorted OSr3Ga2 trigonal bipyramids that share corners with three equivalent O(8)Sr3MgMn trigonal bipyramids and  an edgeedge with one O(6)Sr3Mn2 trigonal bipyramid. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), one Ga(1), and one Ga(2) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one Mg(1), and one Ga(1) atom.
Sr4MgMn2Ga2O11 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(2), one O(6), one O(8), and one O(9) atom. The Sr(1)-O(10) bond length is 2.59 Å. The Sr(1)-O(11) bond length is 2.50 Å. The Sr(1)-O(2) bond length is 2.43 Å. The Sr(1)-O(6) bond length is 2.50 Å. The Sr(1)-O(8) bond length is 2.50 Å. The Sr(1)-O(9) bond length is 2.53 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(2), one O(5), one O(6), one O(8), and one O(9) atom. The Sr(2)-O(1) bond length is 2.80 Å. The Sr(2)-O(11) bond length is 2.83 Å. The Sr(2)-O(2) bond length is 2.65 Å. The Sr(2)-O(5) bond length is 2.66 Å. The Sr(2)-O(6) bond length is 2.52 Å. The Sr(2)-O(8) bond length is 2.48 Å. The Sr(2)-O(9) bond length is 2.55 Å. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(10), one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom. The Sr(3)-O(10) bond length is 2.77 Å. The Sr(3)-O(3) bond length is 2.55 Å. The Sr(3)-O(4) bond length is 2.87 Å. The Sr(3)-O(5) bond length is 2.79 Å. The Sr(3)-O(7) bond length is 2.45 Å. The Sr(3)-O(8) bond length is 2.48 Å. The Sr(3)-O(9) bond length is 2.85 Å. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(3), one O(5), one O(6), one O(7), and two equivalent O(4) atoms. The Sr(4)-O(10) bond length is 2.57 Å. The Sr(4)-O(11) bond length is 2.68 Å. The Sr(4)-O(3) bond length is 2.48 Å. The Sr(4)-O(5) bond length is 2.94 Å. The Sr(4)-O(6) bond length is 2.56 Å. The Sr(4)-O(7) bond length is 2.67 Å. There is one shorter (2.74 Å) and one longer (2.97 Å) Sr(4)-O(4) bond length. Mg(1) is bonded to one O(1), one O(11), one O(2), one O(5), and one O(8) atom to form MgO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Ga(2)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(2)O5 trigonal bipyramid, and  an edgeedge with one Ga(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 24°. The Mg(1)-O(1) bond length is 2.09 Å. The Mg(1)-O(11) bond length is 2.08 Å. The Mg(1)-O(2) bond length is 1.96 Å. The Mg(1)-O(5) bond length is 2.08 Å. The Mg(1)-O(8) bond length is 2.13 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form MnO6 octahedra that share  a cornercorner with one Ga(2)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one Ga(1)O5 trigonal bipyramid, corners with three equivalent Mn(2)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The Mn(1)-O(1) bond length is 2.25 Å. The Mn(1)-O(3) bond length is 1.98 Å. The Mn(1)-O(5) bond length is 2.29 Å. The Mn(1)-O(6) bond length is 2.20 Å. The Mn(1)-O(7) bond length is 1.93 Å. The Mn(1)-O(8) bond length is 2.02 Å. In the second Mn site, Mn(2) is bonded to one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form MnO5 trigonal bipyramids that share corners with three equivalent Mn(1)O6 octahedra,  a cornercorner with one Ga(2)O4 tetrahedra,  a cornercorner with one Ga(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 10-38°. The Mn(2)-O(2) bond length is 2.01 Å. The Mn(2)-O(4) bond length is 2.04 Å. The Mn(2)-O(5) bond length is 1.98 Å. The Mn(2)-O(6) bond length is 1.93 Å. The Mn(2)-O(7) bond length is 2.13 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(10), one O(11), one O(2), one O(3), and one O(9) atom to form distorted GaO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Ga(2)O4 tetrahedra,  a cornercorner with one Mn(2)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 26°. The Ga(1)-O(10) bond length is 2.02 Å. The Ga(1)-O(11) bond length is 1.90 Å. The Ga(1)-O(2) bond length is 2.23 Å. The Ga(1)-O(3) bond length is 1.86 Å. The Ga(1)-O(9) bond length is 1.96 Å. In the second Ga site, Ga(2) is bonded to one O(1), one O(10), one O(4), and one O(9) atom to form GaO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one Mn(2)O5 trigonal bipyramid, and corners with two equivalent Ga(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 40°. The Ga(2)-O(1) bond length is 1.90 Å. The Ga(2)-O(10) bond length is 1.89 Å. The Ga(2)-O(4) bond length is 1.87 Å. The Ga(2)-O(9) bond length is 1.93 Å. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(2), one Mg(1), one Mn(1), and one Ga(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), one Mn(2), and one Ga(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one Mn(1), and one Ga(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(3), two equivalent Sr(4), one Mn(2), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Mg(1), one Mn(1), and one Mn(2) atom. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(2), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr3Mn2 trigonal bipyramids that share  a cornercorner with one O(8)Sr3MgMn trigonal bipyramid,  an edgeedge with one O(9)Sr3Ga2 trigonal bipyramid, and  an edgeedge with one O(8)Sr3MgMn trigonal bipyramid. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom. In the eighth O site, O(8) is bonded to one Sr(1), one Sr(2), one Sr(3), one Mg(1), and one Mn(1) atom to form distorted OSr3MgMn trigonal bipyramids that share  a cornercorner with one O(6)Sr3Mn2 trigonal bipyramid, corners with three equivalent O(9)Sr3Ga2 trigonal bipyramids, and  an edgeedge with one O(6)Sr3Mn2 trigonal bipyramid. In the ninth O site, O(9) is bonded to one Sr(1), one Sr(2), one Sr(3), one Ga(1), and one Ga(2) atom to form distorted OSr3Ga2 trigonal bipyramids that share corners with three equivalent O(8)Sr3MgMn trigonal bipyramids and  an edgeedge with one O(6)Sr3Mn2 trigonal bipyramid. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), one Ga(1), and one Ga(2) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one Mg(1), and one Ga(1) atom.