Be(GaO2)2 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form BeO4 tetrahedra that share  a cornercorner with one Ga(3)O4 tetrahedra, corners with two equivalent Ga(1)O4 tetrahedra, corners with two equivalent Ga(4)O4 tetrahedra, and corners with three equivalent Ga(2)O4 tetrahedra. In the second Be site, Be(2) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form BeO4 tetrahedra that share  a cornercorner with one Ga(2)O4 tetrahedra,  a cornercorner with one Ga(3)O4 tetrahedra, corners with two equivalent Ga(1)O4 tetrahedra, corners with two equivalent Ga(4)O4 tetrahedra, and  an edgeedge with one Ga(3)O4 tetrahedra. There are four 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(4) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(2)O4 tetrahedra,  a cornercorner with one Ga(3)O4 tetrahedra, corners with two equivalent Be(1)O4 tetrahedra, corners with two equivalent Be(2)O4 tetrahedra, and  an edgeedge with one Ga(2)O4 tetrahedra. In the second Ga site, Ga(2) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form GaO4 tetrahedra that share  a cornercorner with one Be(2)O4 tetrahedra,  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ga(4)O4 tetrahedra, corners with three equivalent Be(1)O4 tetrahedra, and  an edgeedge with one Ga(1)O4 tetrahedra. In the third Ga site, Ga(3) is bonded to one O(4), one O(6), one O(7), and one O(8) atom to form GaO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Be(2)O4 tetrahedra,  a cornercorner with one Ga(1)O4 tetrahedra, corners with three equivalent Ga(4)O4 tetrahedra, and  an edgeedge with one Be(2)O4 tetrahedra. In the fourth Ga site, Ga(4) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(2)O4 tetrahedra, corners with two equivalent Be(1)O4 tetrahedra, corners with two equivalent Be(2)O4 tetrahedra, and corners with three equivalent Ga(3)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Be(2), one Ga(1), and one Ga(2) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Be(1), one Ga(1), and one Ga(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Be(1), one Ga(1), and one Ga(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Be(2), one Ga(1), and one Ga(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Be(1), one Ga(2), and one Ga(4) atom. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Be(2), one Ga(3), and one Ga(4) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Be(2), one Ga(3), and one Ga(4) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Be(1), one Ga(3), and one Ga(4) atom.
Be(GaO2)2 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form BeO4 tetrahedra that share  a cornercorner with one Ga(3)O4 tetrahedra, corners with two equivalent Ga(1)O4 tetrahedra, corners with two equivalent Ga(4)O4 tetrahedra, and corners with three equivalent Ga(2)O4 tetrahedra. The Be(1)-O(2) bond length is 1.64 Å. The Be(1)-O(3) bond length is 1.66 Å. The Be(1)-O(5) bond length is 1.66 Å. The Be(1)-O(8) bond length is 1.70 Å. In the second Be site, Be(2) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form BeO4 tetrahedra that share  a cornercorner with one Ga(2)O4 tetrahedra,  a cornercorner with one Ga(3)O4 tetrahedra, corners with two equivalent Ga(1)O4 tetrahedra, corners with two equivalent Ga(4)O4 tetrahedra, and  an edgeedge with one Ga(3)O4 tetrahedra. The Be(2)-O(1) bond length is 1.56 Å. The Be(2)-O(4) bond length is 1.66 Å. The Be(2)-O(6) bond length is 1.76 Å. The Be(2)-O(7) bond length is 1.66 Å. There are four 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(4) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(2)O4 tetrahedra,  a cornercorner with one Ga(3)O4 tetrahedra, corners with two equivalent Be(1)O4 tetrahedra, corners with two equivalent Be(2)O4 tetrahedra, and  an edgeedge with one Ga(2)O4 tetrahedra. The Ga(1)-O(1) bond length is 1.90 Å. The Ga(1)-O(2) bond length is 1.97 Å. The Ga(1)-O(3) bond length is 1.86 Å. The Ga(1)-O(4) bond length is 1.75 Å. In the second Ga site, Ga(2) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form GaO4 tetrahedra that share  a cornercorner with one Be(2)O4 tetrahedra,  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ga(4)O4 tetrahedra, corners with three equivalent Be(1)O4 tetrahedra, and  an edgeedge with one Ga(1)O4 tetrahedra. The Ga(2)-O(1) bond length is 1.96 Å. The Ga(2)-O(2) bond length is 1.93 Å. The Ga(2)-O(3) bond length is 1.85 Å. The Ga(2)-O(5) bond length is 1.84 Å. In the third Ga site, Ga(3) is bonded to one O(4), one O(6), one O(7), and one O(8) atom to form GaO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Be(2)O4 tetrahedra,  a cornercorner with one Ga(1)O4 tetrahedra, corners with three equivalent Ga(4)O4 tetrahedra, and  an edgeedge with one Be(2)O4 tetrahedra. The Ga(3)-O(4) bond length is 1.95 Å. The Ga(3)-O(6) bond length is 1.90 Å. The Ga(3)-O(7) bond length is 1.85 Å. The Ga(3)-O(8) bond length is 1.86 Å. In the fourth Ga site, Ga(4) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(2)O4 tetrahedra, corners with two equivalent Be(1)O4 tetrahedra, corners with two equivalent Be(2)O4 tetrahedra, and corners with three equivalent Ga(3)O4 tetrahedra. The Ga(4)-O(5) bond length is 1.91 Å. The Ga(4)-O(6) bond length is 1.84 Å. The Ga(4)-O(7) bond length is 1.87 Å. The Ga(4)-O(8) bond length is 1.88 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Be(2), one Ga(1), and one Ga(2) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Be(1), one Ga(1), and one Ga(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Be(1), one Ga(1), and one Ga(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Be(2), one Ga(1), and one Ga(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Be(1), one Ga(2), and one Ga(4) atom. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Be(2), one Ga(3), and one Ga(4) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Be(2), one Ga(3), and one Ga(4) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Be(1), one Ga(3), and one Ga(4) atom.