Ca2MnGaO5 crystallizes in the triclinic P1 space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(4), one O(6), one O(7), one O(8), and one O(9) atom. In the second Ca site, Ca(2) 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 third Ca site, Ca(3) 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 fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(5), one O(7), one O(8), one O(9), and two equivalent O(3) atoms. 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 12-15°. 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 12-15°. 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 39-45°. 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 39-45°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ca(4), one Ga(1), and one Ga(2) atom to form distorted OCa2Ga2 tetrahedra that share corners with two equivalent O(10)Ca4Mn2 octahedra, corners with two equivalent O(8)Ca4Mn2 octahedra, and corners with two equivalent O(2)Ca2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 49-66°. In the second O site, O(2) is bonded to one Ca(2), one Ca(3), one Ga(1), and one Ga(2) atom to form distorted OCa2Ga2 tetrahedra that share corners with two equivalent O(10)Ca4Mn2 octahedra, corners with two equivalent O(8)Ca4Mn2 octahedra, and corners with two equivalent O(1)Ca2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 18-83°. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ca(2), two equivalent Ca(4), one Mn(2), and one Ga(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(1), two equivalent Ca(3), 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(2), one Ca(4), one Mn(1), and one Ga(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Mn(1), and one Ga(1) atom. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), one Ca(4), one Mn(1), and one Mn(2) atom. In the eighth O site, O(8) is bonded to one Ca(1), one Ca(2), one Ca(3), one Ca(4), one Mn(1), and one Mn(2) atom to form distorted OCa4Mn2 octahedra that share corners with two equivalent O(10)Ca4Mn2 octahedra, corners with two equivalent O(1)Ca2Ga2 tetrahedra, corners with two equivalent O(2)Ca2Ga2 tetrahedra, and edges with two equivalent O(10)Ca4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 1-2°. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), one Ca(4), 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 Ca(4), one Mn(1), and one Mn(2) atom to form distorted OCa4Mn2 octahedra that share corners with two equivalent O(8)Ca4Mn2 octahedra, corners with two equivalent O(1)Ca2Ga2 tetrahedra, corners with two equivalent O(2)Ca2Ga2 tetrahedra, and edges with two equivalent O(8)Ca4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 1-2°.
Ca2MnGaO5 crystallizes in the triclinic P1 space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(4), one O(6), one O(7), one O(8), and one O(9) atom. The Ca(1)-O(1) bond length is 2.36 Å. The Ca(1)-O(10) bond length is 2.50 Å. The Ca(1)-O(4) bond length is 2.32 Å. The Ca(1)-O(6) bond length is 2.44 Å. The Ca(1)-O(7) bond length is 2.50 Å. The Ca(1)-O(8) bond length is 2.62 Å. The Ca(1)-O(9) bond length is 2.60 Å. In the second Ca site, Ca(2) 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(2)-O(10) bond length is 2.58 Å. The Ca(2)-O(2) bond length is 2.36 Å. The Ca(2)-O(3) bond length is 2.32 Å. The Ca(2)-O(5) bond length is 2.47 Å. The Ca(2)-O(7) bond length is 2.66 Å. The Ca(2)-O(8) bond length is 2.55 Å. The Ca(2)-O(9) bond length is 2.45 Å. In the third Ca site, Ca(3) 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(3)-O(10) bond length is 2.52 Å. The Ca(3)-O(2) bond length is 2.36 Å. The Ca(3)-O(6) bond length is 2.31 Å. The Ca(3)-O(7) bond length is 2.47 Å. The Ca(3)-O(8) bond length is 2.58 Å. The Ca(3)-O(9) bond length is 2.65 Å. There is one shorter (2.50 Å) and one longer (2.97 Å) Ca(3)-O(4) bond length. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(5), one O(7), one O(8), one O(9), and two equivalent O(3) atoms. The Ca(4)-O(1) bond length is 2.36 Å. The Ca(4)-O(10) bond length is 2.62 Å. The Ca(4)-O(5) bond length is 2.30 Å. The Ca(4)-O(7) bond length is 2.61 Å. The Ca(4)-O(8) bond length is 2.49 Å. The Ca(4)-O(9) bond length is 2.49 Å. There is one shorter (2.51 Å) and one longer (2.96 Å) Ca(4)-O(3) bond length. 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 12-15°. The Mn(1)-O(10) bond length is 2.00 Å. The Mn(1)-O(5) bond length is 2.28 Å. The Mn(1)-O(6) bond length is 2.29 Å. The Mn(1)-O(7) bond length is 1.92 Å. The Mn(1)-O(8) bond length is 1.96 Å. The Mn(1)-O(9) bond length is 1.95 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 12-15°. The Mn(2)-O(10) bond length is 1.91 Å. The Mn(2)-O(3) bond length is 2.11 Å. The Mn(2)-O(4) bond length is 2.12 Å. The Mn(2)-O(7) bond length is 2.00 Å. The Mn(2)-O(8) bond length is 1.92 Å. The Mn(2)-O(9) bond length is 1.99 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 39-45°. The Ga(1)-O(1) bond length is 1.93 Å. The Ga(1)-O(2) bond length is 1.91 Å. The Ga(1)-O(3) bond length is 1.85 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 39-45°. The Ga(2)-O(1) bond length is 1.91 Å. The Ga(2)-O(2) bond length is 1.92 Å. The Ga(2)-O(4) bond length is 1.85 Å. The Ga(2)-O(5) bond length is 1.82 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ca(4), one Ga(1), and one Ga(2) atom to form distorted OCa2Ga2 tetrahedra that share corners with two equivalent O(10)Ca4Mn2 octahedra, corners with two equivalent O(8)Ca4Mn2 octahedra, and corners with two equivalent O(2)Ca2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 49-66°. In the second O site, O(2) is bonded to one Ca(2), one Ca(3), one Ga(1), and one Ga(2) atom to form distorted OCa2Ga2 tetrahedra that share corners with two equivalent O(10)Ca4Mn2 octahedra, corners with two equivalent O(8)Ca4Mn2 octahedra, and corners with two equivalent O(1)Ca2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 18-83°. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ca(2), two equivalent Ca(4), one Mn(2), and one Ga(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(1), two equivalent Ca(3), 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(2), one Ca(4), one Mn(1), and one Ga(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Mn(1), and one Ga(1) atom. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), one Ca(4), one Mn(1), and one Mn(2) atom. In the eighth O site, O(8) is bonded to one Ca(1), one Ca(2), one Ca(3), one Ca(4), one Mn(1), and one Mn(2) atom to form distorted OCa4Mn2 octahedra that share corners with two equivalent O(10)Ca4Mn2 octahedra, corners with two equivalent O(1)Ca2Ga2 tetrahedra, corners with two equivalent O(2)Ca2Ga2 tetrahedra, and edges with two equivalent O(10)Ca4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 1-2°. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), one Ca(4), 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 Ca(4), one Mn(1), and one Mn(2) atom to form distorted OCa4Mn2 octahedra that share corners with two equivalent O(8)Ca4Mn2 octahedra, corners with two equivalent O(1)Ca2Ga2 tetrahedra, corners with two equivalent O(2)Ca2Ga2 tetrahedra, and edges with two equivalent O(8)Ca4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 1-2°.