Sr4MgMn4O10 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(2), one O(3), one O(4), one O(5), one O(7), 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(10), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one O(10), one O(2), one O(3), one O(4), one O(5), and one O(7) atom. In the fourth Sr site, Sr(4) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(8), and one O(9) atom. Mg(1) is bonded to one O(1), one O(10), one O(6), one O(8), and one O(9) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O5 trigonal bipyramid,  a cornercorner with one Mn(3)O4 trigonal pyramid,  an edgeedge with one Mn(2)O6 octahedra, and  an edgeedge with one Mn(3)O4 trigonal pyramid. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form distorted MnO5 trigonal bipyramids that share corners with four equivalent Mn(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  a cornercorner with one Mn(3)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 4-47°. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form distorted MnO6 octahedra that share corners with four equivalent Mn(1)O5 trigonal bipyramids,  a cornercorner with one Mn(3)O4 trigonal pyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. In the third Mn site, Mn(3) is bonded to one O(10), one O(5), one O(8), and one O(9) atom to form distorted MnO4 trigonal pyramids that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one Mn(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 28°. In the fourth Mn site, Mn(4) is bonded in a distorted see-saw-like geometry to one O(10), one O(6), one O(7), and one O(9) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(4), one Mg(1), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(3)Sr4Mn2 octahedra, corners with two equivalent O(10)Sr2MgMn2 trigonal bipyramids, corners with two equivalent O(9)Sr2MgMn2 trigonal bipyramids, edges with two equivalent O(3)Sr4Mn2 octahedra, and faces with two equivalent O(4)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 8-10°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(2)Sr4Mn2 octahedra, corners with two equivalent O(10)Sr2MgMn2 trigonal bipyramids, corners with two equivalent O(9)Sr2MgMn2 trigonal bipyramids, edges with two equivalent O(2)Sr4Mn2 octahedra, and faces with two equivalent O(4)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 8-10°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(10)Sr2MgMn2 trigonal bipyramids, corners with two equivalent O(9)Sr2MgMn2 trigonal bipyramids, faces with two equivalent O(2)Sr4Mn2 octahedra, and faces with two equivalent O(3)Sr4Mn2 octahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Mn(1), and one Mn(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one Mg(1), and one Mn(4) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), one Mn(2), and one Mn(4) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(4), one Mg(1), one Mn(2), and one Mn(3) atom. In the ninth O site, O(9) is bonded to one Sr(1), one Sr(4), one Mg(1), one Mn(3), and one Mn(4) atom to form distorted OSr2MgMn2 trigonal bipyramids that share corners with two equivalent O(2)Sr4Mn2 octahedra, corners with two equivalent O(3)Sr4Mn2 octahedra, corners with two equivalent O(4)Sr4Mn2 octahedra, and corners with three equivalent O(10)Sr2MgMn2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 16-80°. In the tenth O site, O(10) is bonded to one Sr(2), one Sr(3), one Mg(1), one Mn(3), and one Mn(4) atom to form distorted OSr2MgMn2 trigonal bipyramids that share corners with two equivalent O(2)Sr4Mn2 octahedra, corners with two equivalent O(3)Sr4Mn2 octahedra, corners with two equivalent O(4)Sr4Mn2 octahedra, and corners with three equivalent O(9)Sr2MgMn2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 32-63°.
Sr4MgMn4O10 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(2), one O(3), one O(4), one O(5), one O(7), and one O(9) atom. The Sr(1)-O(2) bond length is 2.68 Å. The Sr(1)-O(3) bond length is 2.68 Å. The Sr(1)-O(4) bond length is 2.66 Å. The Sr(1)-O(5) bond length is 2.56 Å. The Sr(1)-O(7) bond length is 2.76 Å. The Sr(1)-O(9) bond length is 2.58 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. The Sr(2)-O(1) bond length is 2.60 Å. The Sr(2)-O(10) bond length is 2.52 Å. The Sr(2)-O(2) bond length is 2.57 Å. The Sr(2)-O(3) bond length is 2.48 Å. The Sr(2)-O(4) bond length is 2.41 Å. The Sr(2)-O(6) bond length is 2.56 Å. The Sr(2)-O(8) bond length is 2.63 Å. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one O(10), one O(2), one O(3), one O(4), one O(5), and one O(7) atom. The Sr(3)-O(10) bond length is 2.57 Å. The Sr(3)-O(2) bond length is 2.65 Å. The Sr(3)-O(3) bond length is 2.53 Å. The Sr(3)-O(4) bond length is 2.52 Å. The Sr(3)-O(5) bond length is 2.67 Å. The Sr(3)-O(7) bond length is 2.74 Å. In the fourth Sr site, Sr(4) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(8), and one O(9) atom. The Sr(4)-O(1) bond length is 2.85 Å. The Sr(4)-O(2) bond length is 2.57 Å. The Sr(4)-O(3) bond length is 2.78 Å. The Sr(4)-O(4) bond length is 2.57 Å. The Sr(4)-O(6) bond length is 2.53 Å. The Sr(4)-O(8) bond length is 2.60 Å. The Sr(4)-O(9) bond length is 2.55 Å. Mg(1) is bonded to one O(1), one O(10), one O(6), one O(8), and one O(9) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O5 trigonal bipyramid,  a cornercorner with one Mn(3)O4 trigonal pyramid,  an edgeedge with one Mn(2)O6 octahedra, and  an edgeedge with one Mn(3)O4 trigonal pyramid. The Mg(1)-O(1) bond length is 2.14 Å. The Mg(1)-O(10) bond length is 2.03 Å. The Mg(1)-O(6) bond length is 2.05 Å. The Mg(1)-O(8) bond length is 2.27 Å. The Mg(1)-O(9) bond length is 2.02 Å. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form distorted MnO5 trigonal bipyramids that share corners with four equivalent Mn(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  a cornercorner with one Mn(3)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 4-47°. The Mn(1)-O(1) bond length is 1.98 Å. The Mn(1)-O(2) bond length is 1.97 Å. The Mn(1)-O(3) bond length is 1.97 Å. The Mn(1)-O(4) bond length is 2.11 Å. The Mn(1)-O(5) bond length is 2.08 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form distorted MnO6 octahedra that share corners with four equivalent Mn(1)O5 trigonal bipyramids,  a cornercorner with one Mn(3)O4 trigonal pyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The Mn(2)-O(1) bond length is 1.95 Å. The Mn(2)-O(2) bond length is 2.23 Å. The Mn(2)-O(3) bond length is 2.42 Å. The Mn(2)-O(4) bond length is 1.99 Å. The Mn(2)-O(7) bond length is 2.01 Å. The Mn(2)-O(8) bond length is 2.18 Å. In the third Mn site, Mn(3) is bonded to one O(10), one O(5), one O(8), and one O(9) atom to form distorted MnO4 trigonal pyramids that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one Mn(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 28°. The Mn(3)-O(10) bond length is 2.14 Å. The Mn(3)-O(5) bond length is 1.99 Å. The Mn(3)-O(8) bond length is 2.12 Å. The Mn(3)-O(9) bond length is 2.18 Å. In the fourth Mn site, Mn(4) is bonded in a distorted see-saw-like geometry to one O(10), one O(6), one O(7), and one O(9) atom. The Mn(4)-O(10) bond length is 2.15 Å. The Mn(4)-O(6) bond length is 2.02 Å. The Mn(4)-O(7) bond length is 2.01 Å. The Mn(4)-O(9) bond length is 2.20 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(4), one Mg(1), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(3)Sr4Mn2 octahedra, corners with two equivalent O(10)Sr2MgMn2 trigonal bipyramids, corners with two equivalent O(9)Sr2MgMn2 trigonal bipyramids, edges with two equivalent O(3)Sr4Mn2 octahedra, and faces with two equivalent O(4)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 8-10°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(2)Sr4Mn2 octahedra, corners with two equivalent O(10)Sr2MgMn2 trigonal bipyramids, corners with two equivalent O(9)Sr2MgMn2 trigonal bipyramids, edges with two equivalent O(2)Sr4Mn2 octahedra, and faces with two equivalent O(4)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 8-10°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(10)Sr2MgMn2 trigonal bipyramids, corners with two equivalent O(9)Sr2MgMn2 trigonal bipyramids, faces with two equivalent O(2)Sr4Mn2 octahedra, and faces with two equivalent O(3)Sr4Mn2 octahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Mn(1), and one Mn(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one Mg(1), and one Mn(4) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), one Mn(2), and one Mn(4) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(4), one Mg(1), one Mn(2), and one Mn(3) atom. In the ninth O site, O(9) is bonded to one Sr(1), one Sr(4), one Mg(1), one Mn(3), and one Mn(4) atom to form distorted OSr2MgMn2 trigonal bipyramids that share corners with two equivalent O(2)Sr4Mn2 octahedra, corners with two equivalent O(3)Sr4Mn2 octahedra, corners with two equivalent O(4)Sr4Mn2 octahedra, and corners with three equivalent O(10)Sr2MgMn2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 16-80°. In the tenth O site, O(10) is bonded to one Sr(2), one Sr(3), one Mg(1), one Mn(3), and one Mn(4) atom to form distorted OSr2MgMn2 trigonal bipyramids that share corners with two equivalent O(2)Sr4Mn2 octahedra, corners with two equivalent O(3)Sr4Mn2 octahedra, corners with two equivalent O(4)Sr4Mn2 octahedra, and corners with three equivalent O(9)Sr2MgMn2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 32-63°.