Sr4CaMn2(GaO5)2 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 6-coordinate geometry to one O(1), one O(2), one O(3), one O(6), one O(8), and one O(9) atom. Ca(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(5), one O(7), and one O(9) atom. There are two 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(6) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Ga(2)O4 tetrahedra and corners with four equivalent Mn(2)O5 trigonal bipyramids. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(8) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Ga(1)O4 tetrahedra and corners with four equivalent Mn(1)O5 trigonal bipyramids. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(10), one O(5), one O(8), and one O(9) atom to form distorted GaO4 tetrahedra that share  a cornercorner with one Mn(2)O5 trigonal bipyramid and  an edgeedge with one Ga(2)O4 tetrahedra. In the second Ga site, Ga(2) is bonded to one O(10), one O(6), one O(7), and one O(9) atom to form distorted GaO4 tetrahedra that share  a cornercorner with one Mn(1)O5 trigonal bipyramid and  an edgeedge with one Ga(1)O4 tetrahedra. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), one Sr(4), one Ca(1), one Mn(1), and one Mn(2) atom to form distorted edge-sharing OSr2CaMn2 trigonal bipyramids. 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, edges with two equivalent O(3)Sr4Mn2 octahedra, and edges with two equivalent O(1)Sr2CaMn2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 18°. 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, edges with two equivalent O(2)Sr4Mn2 octahedra, and edges with two equivalent O(1)Sr2CaMn2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 18°. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Mn(1), and one Mn(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Ca(1), and one Ga(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one Mn(1), and one Ga(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Ca(1), and one Ga(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one Mn(2), and one Ga(1) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(4), one Ca(1), one Ga(1), and one Ga(2) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(3), one Ca(1), one Ga(1), and one Ga(2) atom.
Sr4CaMn2(GaO5)2 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 2.80 Å. The Sr(1)-O(3) bond length is 2.74 Å. The Sr(1)-O(4) bond length is 2.40 Å. The Sr(1)-O(5) bond length is 2.54 Å. The Sr(1)-O(7) bond length is 2.55 Å. The Sr(1)-O(9) bond length is 2.89 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 2.54 Å. The Sr(2)-O(10) bond length is 2.80 Å. The Sr(2)-O(2) bond length is 2.64 Å. The Sr(2)-O(3) bond length is 2.67 Å. The Sr(2)-O(4) bond length is 3.18 Å. The Sr(2)-O(6) bond length is 2.71 Å. The Sr(2)-O(8) bond length is 2.64 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 2.87 Å. The Sr(3)-O(2) bond length is 2.80 Å. The Sr(3)-O(3) bond length is 2.74 Å. The Sr(3)-O(4) bond length is 2.41 Å. The Sr(3)-O(5) bond length is 2.54 Å. The Sr(3)-O(7) bond length is 2.53 Å. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(6), one O(8), and one O(9) atom. The Sr(4)-O(1) bond length is 2.56 Å. The Sr(4)-O(2) bond length is 2.61 Å. The Sr(4)-O(3) bond length is 2.63 Å. The Sr(4)-O(6) bond length is 2.64 Å. The Sr(4)-O(8) bond length is 2.71 Å. The Sr(4)-O(9) bond length is 2.80 Å. Ca(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(5), one O(7), and one O(9) atom. The Ca(1)-O(1) bond length is 2.09 Å. The Ca(1)-O(10) bond length is 2.51 Å. The Ca(1)-O(5) bond length is 2.33 Å. The Ca(1)-O(7) bond length is 2.34 Å. The Ca(1)-O(9) bond length is 2.51 Å. There are two 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(6) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Ga(2)O4 tetrahedra and corners with four equivalent Mn(2)O5 trigonal bipyramids. The Mn(1)-O(1) bond length is 2.06 Å. The Mn(1)-O(2) bond length is 2.36 Å. The Mn(1)-O(3) bond length is 2.43 Å. The Mn(1)-O(4) bond length is 1.98 Å. The Mn(1)-O(6) bond length is 2.10 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(8) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Ga(1)O4 tetrahedra and corners with four equivalent Mn(1)O5 trigonal bipyramids. The Mn(2)-O(1) bond length is 2.06 Å. The Mn(2)-O(2) bond length is 2.39 Å. The Mn(2)-O(3) bond length is 2.41 Å. The Mn(2)-O(4) bond length is 1.98 Å. The Mn(2)-O(8) bond length is 2.10 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(10), one O(5), one O(8), and one O(9) atom to form distorted GaO4 tetrahedra that share  a cornercorner with one Mn(2)O5 trigonal bipyramid and  an edgeedge with one Ga(2)O4 tetrahedra. The Ga(1)-O(10) bond length is 1.98 Å. The Ga(1)-O(5) bond length is 1.86 Å. The Ga(1)-O(8) bond length is 1.78 Å. The Ga(1)-O(9) bond length is 1.98 Å. In the second Ga site, Ga(2) is bonded to one O(10), one O(6), one O(7), and one O(9) atom to form distorted GaO4 tetrahedra that share  a cornercorner with one Mn(1)O5 trigonal bipyramid and  an edgeedge with one Ga(1)O4 tetrahedra. The Ga(2)-O(10) bond length is 1.99 Å. The Ga(2)-O(6) bond length is 1.78 Å. The Ga(2)-O(7) bond length is 1.86 Å. The Ga(2)-O(9) bond length is 1.98 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), one Sr(4), one Ca(1), one Mn(1), and one Mn(2) atom to form distorted edge-sharing OSr2CaMn2 trigonal bipyramids. 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, edges with two equivalent O(3)Sr4Mn2 octahedra, and edges with two equivalent O(1)Sr2CaMn2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 18°. 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, edges with two equivalent O(2)Sr4Mn2 octahedra, and edges with two equivalent O(1)Sr2CaMn2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 18°. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Mn(1), and one Mn(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Ca(1), and one Ga(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one Mn(1), and one Ga(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Ca(1), and one Ga(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one Mn(2), and one Ga(1) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(4), one Ca(1), one Ga(1), and one Ga(2) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(3), one Ca(1), one Ga(1), and one Ga(2) atom.