K2Ga2B2O7 crystallizes in the trigonal P321 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(5) and three equivalent O(2) atoms to form corner-sharing GaO4 tetrahedra. In the second Ga site, Ga(2) is bonded to one O(5) and three equivalent O(1) atoms to form corner-sharing GaO4 tetrahedra. In the third Ga site, Ga(3) is bonded to one O(4) and three equivalent O(3) atoms to form corner-sharing GaO4 tetrahedra. B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are five inequivalent O sites. In the first O site, O(5) is bonded in a distorted linear geometry to three equivalent K(1), one Ga(1), and one Ga(2) atom. In the second O site, O(1) is bonded in a 3-coordinate geometry to one K(1), one K(2), one Ga(2), and one B(1) atom. In the third O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Ga(1), and one B(1) atom. In the fourth O site, O(3) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Ga(3), and one B(1) atom. In the fifth O site, O(4) is bonded in a linear geometry to three equivalent K(2) and two equivalent Ga(3) atoms.
K2Ga2B2O7 crystallizes in the trigonal P321 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. Both K(1)-O(1) bond lengths are 3.29 Å. Both K(1)-O(2) bond lengths are 3.02 Å. Both K(1)-O(3) bond lengths are 2.72 Å. Both K(1)-O(5) bond lengths are 2.98 Å. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. The K(2)-O(4) bond length is 3.09 Å. Both K(2)-O(1) bond lengths are 2.68 Å. Both K(2)-O(2) bond lengths are 2.79 Å. Both K(2)-O(3) bond lengths are 3.26 Å. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(5) and three equivalent O(2) atoms to form corner-sharing GaO4 tetrahedra. The Ga(1)-O(5) bond length is 1.82 Å. All Ga(1)-O(2) bond lengths are 1.86 Å. In the second Ga site, Ga(2) is bonded to one O(5) and three equivalent O(1) atoms to form corner-sharing GaO4 tetrahedra. The Ga(2)-O(5) bond length is 1.82 Å. All Ga(2)-O(1) bond lengths are 1.86 Å. In the third Ga site, Ga(3) is bonded to one O(4) and three equivalent O(3) atoms to form corner-sharing GaO4 tetrahedra. The Ga(3)-O(4) bond length is 1.81 Å. All Ga(3)-O(3) bond lengths are 1.87 Å. B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The B(1)-O(1) bond length is 1.39 Å. The B(1)-O(2) bond length is 1.38 Å. The B(1)-O(3) bond length is 1.39 Å. There are five inequivalent O sites. In the first O site, O(5) is bonded in a distorted linear geometry to three equivalent K(1), one Ga(1), and one Ga(2) atom. In the second O site, O(1) is bonded in a 3-coordinate geometry to one K(1), one K(2), one Ga(2), and one B(1) atom. In the third O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Ga(1), and one B(1) atom. In the fourth O site, O(3) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Ga(3), and one B(1) atom. In the fifth O site, O(4) is bonded in a linear geometry to three equivalent K(2) and two equivalent Ga(3) atoms.