Ca3Mn2(GaO5)2 crystallizes in the triclinic P1 space group. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(3), one O(5), one O(7), one O(8), and one O(9) atom. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(10), one O(2), one O(6), one O(7), one O(8), one O(9), and two equivalent O(4) atoms. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(5), one O(7), one O(8), and one O(9) atom. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(10), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with four equivalent Mn(2)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra, and  a cornercorner with one Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 5-23°. In the second Mn site, Mn(2) is bonded to one O(10), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra, and  a cornercorner with one Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 5-23°. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with two equivalent Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-46°. In the second Ga site, Ga(2) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form GaO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with two equivalent Ga(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 42-46°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Ca(3), one Ga(1), and one Ga(2) atom. In the second O site, O(2) is bonded to one Ca(1), one Ca(2), one Ga(1), and one Ga(2) atom to form distorted corner-sharing OCa2Ga2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Mn(2), and one Ga(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Ca(2), one Mn(2), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Mn(1), and one Ga(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Ca(2), one Mn(1), and one Ga(1) atom. In the seventh O site, O(7) is bonded to one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(2) atom to form OCa3Mn2 square pyramids that share corners with two equivalent O(2)Ca2Ga2 tetrahedra,  an edgeedge with one O(10)Ca3Mn2 square pyramid, and  a faceface with one O(10)Ca3Mn2 square pyramid. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(2) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(2) atom. In the tenth O site, O(10) is bonded to one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(2) atom to form distorted OCa3Mn2 square pyramids that share corners with two equivalent O(2)Ca2Ga2 tetrahedra,  an edgeedge with one O(7)Ca3Mn2 square pyramid, and  a faceface with one O(7)Ca3Mn2 square pyramid.
Ca3Mn2(GaO5)2 crystallizes in the triclinic P1 space group. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(3), one O(5), one O(7), one O(8), and one O(9) atom. The Ca(1)-O(10) bond length is 2.45 Å. The Ca(1)-O(2) bond length is 2.36 Å. The Ca(1)-O(3) bond length is 2.37 Å. The Ca(1)-O(5) bond length is 2.53 Å. The Ca(1)-O(7) bond length is 2.42 Å. The Ca(1)-O(8) bond length is 2.42 Å. The Ca(1)-O(9) bond length is 2.38 Å. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(10), one O(2), one O(6), one O(7), one O(8), one O(9), and two equivalent O(4) atoms. The Ca(2)-O(10) bond length is 2.44 Å. The Ca(2)-O(2) bond length is 2.28 Å. The Ca(2)-O(6) bond length is 2.25 Å. The Ca(2)-O(7) bond length is 2.41 Å. The Ca(2)-O(8) bond length is 2.53 Å. The Ca(2)-O(9) bond length is 2.60 Å. There is one shorter (2.50 Å) and one longer (2.98 Å) Ca(2)-O(4) bond length. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(5), one O(7), one O(8), and one O(9) atom. The Ca(3)-O(1) bond length is 2.23 Å. The Ca(3)-O(10) bond length is 2.50 Å. The Ca(3)-O(3) bond length is 2.49 Å. The Ca(3)-O(5) bond length is 2.29 Å. The Ca(3)-O(7) bond length is 2.44 Å. The Ca(3)-O(8) bond length is 2.42 Å. The Ca(3)-O(9) bond length is 2.47 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(10), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with four equivalent Mn(2)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra, and  a cornercorner with one Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 5-23°. The Mn(1)-O(10) bond length is 2.02 Å. The Mn(1)-O(5) bond length is 2.04 Å. The Mn(1)-O(6) bond length is 1.87 Å. The Mn(1)-O(7) bond length is 1.96 Å. The Mn(1)-O(8) bond length is 1.97 Å. The Mn(1)-O(9) bond length is 2.03 Å. In the second Mn site, Mn(2) is bonded to one O(10), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra, and  a cornercorner with one Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 5-23°. The Mn(2)-O(10) bond length is 1.93 Å. The Mn(2)-O(3) bond length is 2.09 Å. The Mn(2)-O(4) bond length is 1.87 Å. The Mn(2)-O(7) bond length is 2.04 Å. The Mn(2)-O(8) bond length is 2.00 Å. The Mn(2)-O(9) bond length is 1.93 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with two equivalent Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-46°. The Ga(1)-O(1) bond length is 1.84 Å. The Ga(1)-O(2) bond length is 1.90 Å. The Ga(1)-O(3) bond length is 1.86 Å. The Ga(1)-O(6) bond length is 1.83 Å. In the second Ga site, Ga(2) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form GaO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with two equivalent Ga(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 42-46°. The Ga(2)-O(1) bond length is 1.82 Å. The Ga(2)-O(2) bond length is 1.90 Å. The Ga(2)-O(4) bond length is 1.86 Å. The Ga(2)-O(5) bond length is 1.88 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Ca(3), one Ga(1), and one Ga(2) atom. In the second O site, O(2) is bonded to one Ca(1), one Ca(2), one Ga(1), and one Ga(2) atom to form distorted corner-sharing OCa2Ga2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Mn(2), and one Ga(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Ca(2), one Mn(2), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Mn(1), and one Ga(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Ca(2), one Mn(1), and one Ga(1) atom. In the seventh O site, O(7) is bonded to one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(2) atom to form OCa3Mn2 square pyramids that share corners with two equivalent O(2)Ca2Ga2 tetrahedra,  an edgeedge with one O(10)Ca3Mn2 square pyramid, and  a faceface with one O(10)Ca3Mn2 square pyramid. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(2) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(2) atom. In the tenth O site, O(10) is bonded to one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(2) atom to form distorted OCa3Mn2 square pyramids that share corners with two equivalent O(2)Ca2Ga2 tetrahedra,  an edgeedge with one O(7)Ca3Mn2 square pyramid, and  a faceface with one O(7)Ca3Mn2 square pyramid.