Sr4CaMn2(GaO5)2 crystallizes in the monoclinic C2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and two equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), one O(7), and three equivalent O(6) atoms. Ca(1) is bonded to one O(3), two equivalent O(5), and two equivalent O(7) atoms to form distorted CaO5 trigonal bipyramids that share corners with two equivalent Mn(1)O5 trigonal bipyramids, corners with two equivalent Ga(1)O4 trigonal pyramids, and edges with two equivalent Ga(1)O4 trigonal pyramids. Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(6) atom to form MnO5 trigonal bipyramids that share  a cornercorner with one Ca(1)O5 trigonal bipyramid, corners with four equivalent Mn(1)O5 trigonal bipyramids, and  a cornercorner with one Ga(1)O4 trigonal pyramid. Ga(1) is bonded to one O(5), one O(6), and two equivalent O(7) atoms to form distorted GaO4 trigonal pyramids that share  a cornercorner with one Ca(1)O5 trigonal bipyramid,  a cornercorner with one Mn(1)O5 trigonal bipyramid,  an edgeedge with one Ca(1)O5 trigonal bipyramid, and  an edgeedge with one Ga(1)O4 trigonal pyramid. There are seven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms to form a mixture of edge, face, and corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 11°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms to form face-sharing OSr4Mn2 octahedra. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Ca(1), and two equivalent Mn(1) atoms. In the fourth O site, O(4) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms to form a mixture of distorted edge, face, and corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 11°. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Ca(1), and one Ga(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to three equivalent Sr(2), one Mn(1), and one Ga(1) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Ca(1), and two equivalent Ga(1) atoms.
Sr4CaMn2(GaO5)2 crystallizes in the monoclinic C2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and two equivalent O(5) atoms. The Sr(1)-O(1) bond length is 2.62 Å. The Sr(1)-O(2) bond length is 2.43 Å. The Sr(1)-O(3) bond length is 2.73 Å. The Sr(1)-O(4) bond length is 2.65 Å. The Sr(1)-O(7) bond length is 2.89 Å. There is one shorter (2.58 Å) and one longer (2.74 Å) Sr(1)-O(5) bond length. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), one O(7), and three equivalent O(6) atoms. The Sr(2)-O(1) bond length is 2.52 Å. The Sr(2)-O(2) bond length is 2.55 Å. The Sr(2)-O(4) bond length is 2.72 Å. The Sr(2)-O(7) bond length is 2.51 Å. There are a spread of Sr(2)-O(6) bond distances ranging from 2.73-3.15 Å. Ca(1) is bonded to one O(3), two equivalent O(5), and two equivalent O(7) atoms to form distorted CaO5 trigonal bipyramids that share corners with two equivalent Mn(1)O5 trigonal bipyramids, corners with two equivalent Ga(1)O4 trigonal pyramids, and edges with two equivalent Ga(1)O4 trigonal pyramids. The Ca(1)-O(3) bond length is 2.20 Å. Both Ca(1)-O(5) bond lengths are 2.39 Å. Both Ca(1)-O(7) bond lengths are 2.32 Å. Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(6) atom to form MnO5 trigonal bipyramids that share  a cornercorner with one Ca(1)O5 trigonal bipyramid, corners with four equivalent Mn(1)O5 trigonal bipyramids, and  a cornercorner with one Ga(1)O4 trigonal pyramid. The Mn(1)-O(1) bond length is 2.23 Å. The Mn(1)-O(2) bond length is 2.19 Å. The Mn(1)-O(3) bond length is 2.10 Å. The Mn(1)-O(4) bond length is 2.14 Å. The Mn(1)-O(6) bond length is 2.22 Å. Ga(1) is bonded to one O(5), one O(6), and two equivalent O(7) atoms to form distorted GaO4 trigonal pyramids that share  a cornercorner with one Ca(1)O5 trigonal bipyramid,  a cornercorner with one Mn(1)O5 trigonal bipyramid,  an edgeedge with one Ca(1)O5 trigonal bipyramid, and  an edgeedge with one Ga(1)O4 trigonal pyramid. The Ga(1)-O(5) bond length is 1.83 Å. The Ga(1)-O(6) bond length is 1.83 Å. There is one shorter (1.94 Å) and one longer (2.05 Å) Ga(1)-O(7) bond length. There are seven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms to form a mixture of edge, face, and corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 11°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms to form face-sharing OSr4Mn2 octahedra. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Ca(1), and two equivalent Mn(1) atoms. In the fourth O site, O(4) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms to form a mixture of distorted edge, face, and corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 11°. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Ca(1), and one Ga(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to three equivalent Sr(2), one Mn(1), and one Ga(1) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Ca(1), and two equivalent Ga(1) atoms.