Ca3Ga2(FeO5)2 crystallizes in the monoclinic Pc 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(1), one O(2), one O(4), one O(5), one O(6), 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(4), one O(5), one O(7), and one O(9) atom. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form FeO6 octahedra that share corners with four equivalent Fe(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 8-23°. In the second Fe site, Fe(2) is bonded to one O(10), one O(2), one O(4), one O(5), one O(6), and one O(9) atom to form FeO6 octahedra that share corners with four equivalent Fe(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 8-23°. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form GaO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, and corners with two equivalent Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-50°. In the second Ga site, Ga(2) is bonded to one O(1), one O(10), one O(7), and one O(8) atom to form GaO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, and corners with two equivalent Ga(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-46°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Ca(1), 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 Ca(3), one Fe(1), and one Fe(2) atom to form distorted OCa3Fe2 square pyramids that share corners with two equivalent O(7)Ca2Ga2 tetrahedra,  an edgeedge with one O(4)Ca3Fe2 square pyramid, and  a faceface with one O(4)Ca3Fe2 square pyramid. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ca(2), one Fe(1), and one Ga(1) atom. In the fourth O site, O(4) is bonded to one Ca(1), one Ca(2), one Ca(3), one Fe(1), and one Fe(2) atom to form distorted OCa3Fe2 square pyramids that share corners with two equivalent O(7)Ca2Ga2 tetrahedra,  an edgeedge with one O(2)Ca3Fe2 square pyramid, and  a faceface with one O(2)Ca3Fe2 square pyramid. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), one Fe(1), and one Fe(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Fe(2), and one Ga(1) atom. In the seventh O site, O(7) is bonded to one Ca(2), one Ca(3), one Ga(1), and one Ga(2) atom to form distorted corner-sharing OCa2Ga2 tetrahedra. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Fe(1), and one Ga(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 Fe(1), and one Fe(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(2), one Fe(2), and one Ga(2) atom.
Ca3Ga2(FeO5)2 crystallizes in the monoclinic Pc 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(1), one O(2), one O(4), one O(5), one O(6), one O(8), and one O(9) atom. The Ca(1)-O(1) bond length is 2.23 Å. The Ca(1)-O(2) bond length is 2.55 Å. The Ca(1)-O(4) bond length is 2.46 Å. The Ca(1)-O(5) bond length is 2.47 Å. The Ca(1)-O(6) bond length is 2.52 Å. The Ca(1)-O(8) bond length is 2.31 Å. The Ca(1)-O(9) bond length is 2.47 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(4), one O(5), one O(7), and one O(9) atom. The Ca(2)-O(10) bond length is 2.47 Å. The Ca(2)-O(2) bond length is 2.44 Å. The Ca(2)-O(3) bond length is 2.26 Å. The Ca(2)-O(4) bond length is 2.53 Å. The Ca(2)-O(5) bond length is 2.66 Å. The Ca(2)-O(7) bond length is 2.33 Å. The Ca(2)-O(9) bond length is 2.50 Å. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The Ca(3)-O(2) bond length is 2.41 Å. The Ca(3)-O(4) bond length is 2.52 Å. The Ca(3)-O(5) bond length is 2.43 Å. The Ca(3)-O(6) bond length is 2.41 Å. The Ca(3)-O(7) bond length is 2.39 Å. The Ca(3)-O(8) bond length is 2.63 Å. The Ca(3)-O(9) bond length is 2.42 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form FeO6 octahedra that share corners with four equivalent Fe(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 8-23°. The Fe(1)-O(2) bond length is 1.90 Å. The Fe(1)-O(3) bond length is 1.89 Å. The Fe(1)-O(4) bond length is 2.09 Å. The Fe(1)-O(5) bond length is 1.94 Å. The Fe(1)-O(8) bond length is 2.04 Å. The Fe(1)-O(9) bond length is 2.23 Å. In the second Fe site, Fe(2) is bonded to one O(10), one O(2), one O(4), one O(5), one O(6), and one O(9) atom to form FeO6 octahedra that share corners with four equivalent Fe(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 8-23°. The Fe(2)-O(10) bond length is 1.93 Å. The Fe(2)-O(2) bond length is 2.19 Å. The Fe(2)-O(4) bond length is 1.91 Å. The Fe(2)-O(5) bond length is 2.04 Å. The Fe(2)-O(6) bond length is 2.08 Å. The Fe(2)-O(9) bond length is 1.88 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form GaO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, and corners with two equivalent Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-50°. The Ga(1)-O(1) bond length is 1.85 Å. The Ga(1)-O(3) bond length is 1.83 Å. The Ga(1)-O(6) bond length is 1.88 Å. The Ga(1)-O(7) bond length is 1.90 Å. In the second Ga site, Ga(2) is bonded to one O(1), one O(10), one O(7), and one O(8) atom to form GaO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, and corners with two equivalent Ga(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-46°. The Ga(2)-O(1) bond length is 1.83 Å. The Ga(2)-O(10) bond length is 1.86 Å. The Ga(2)-O(7) bond length is 1.91 Å. The Ga(2)-O(8) bond length is 1.89 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(1), 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 Ca(3), one Fe(1), and one Fe(2) atom to form distorted OCa3Fe2 square pyramids that share corners with two equivalent O(7)Ca2Ga2 tetrahedra,  an edgeedge with one O(4)Ca3Fe2 square pyramid, and  a faceface with one O(4)Ca3Fe2 square pyramid. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ca(2), one Fe(1), and one Ga(1) atom. In the fourth O site, O(4) is bonded to one Ca(1), one Ca(2), one Ca(3), one Fe(1), and one Fe(2) atom to form distorted OCa3Fe2 square pyramids that share corners with two equivalent O(7)Ca2Ga2 tetrahedra,  an edgeedge with one O(2)Ca3Fe2 square pyramid, and  a faceface with one O(2)Ca3Fe2 square pyramid. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), one Fe(1), and one Fe(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Fe(2), and one Ga(1) atom. In the seventh O site, O(7) is bonded to one Ca(2), one Ca(3), one Ga(1), and one Ga(2) atom to form distorted corner-sharing OCa2Ga2 tetrahedra. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Fe(1), and one Ga(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 Fe(1), and one Fe(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(2), one Fe(2), and one Ga(2) atom.