BeNd2Ga2O7 is Esseneite-like structured and crystallizes in the tetragonal P-42_1m space group. Be(1) is bonded to four equivalent O(3) atoms to form BeO4 tetrahedra that share corners with four equivalent Ga(1)O4 tetrahedra. Nd(1) is bonded in a 8-coordinate geometry to one O(1), three equivalent O(2), and four equivalent O(3) atoms. Ga(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form GaO4 tetrahedra that share  a cornercorner with one Ga(1)O4 tetrahedra and corners with two equivalent Be(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Nd(1) and two equivalent Ga(1) atoms to form a mixture of distorted corner and edge-sharing ONd2Ga2 tetrahedra. In the second O site, O(2) is bonded to three equivalent Nd(1) and one Ga(1) atom to form ONd3Ga tetrahedra that share corners with two equivalent O(1)Nd2Ga2 tetrahedra, corners with four equivalent O(2)Nd3Ga tetrahedra,  an edgeedge with one O(1)Nd2Ga2 tetrahedra, and  an edgeedge with one O(2)Nd3Ga tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Be(1), two equivalent Nd(1), and one Ga(1) atom.
BeNd2Ga2O7 is Esseneite-like structured and crystallizes in the tetragonal P-42_1m space group. Be(1) is bonded to four equivalent O(3) atoms to form BeO4 tetrahedra that share corners with four equivalent Ga(1)O4 tetrahedra. All Be(1)-O(3) bond lengths are 1.67 Å. Nd(1) is bonded in a 8-coordinate geometry to one O(1), three equivalent O(2), and four equivalent O(3) atoms. The Nd(1)-O(1) bond length is 2.48 Å. There is one shorter (2.41 Å) and two longer (2.50 Å) Nd(1)-O(2) bond lengths. There are two shorter (2.42 Å) and two longer (3.00 Å) Nd(1)-O(3) bond lengths. Ga(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form GaO4 tetrahedra that share  a cornercorner with one Ga(1)O4 tetrahedra and corners with two equivalent Be(1)O4 tetrahedra. The Ga(1)-O(1) bond length is 1.87 Å. The Ga(1)-O(2) bond length is 1.84 Å. Both Ga(1)-O(3) bond lengths are 1.86 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Nd(1) and two equivalent Ga(1) atoms to form a mixture of distorted corner and edge-sharing ONd2Ga2 tetrahedra. In the second O site, O(2) is bonded to three equivalent Nd(1) and one Ga(1) atom to form ONd3Ga tetrahedra that share corners with two equivalent O(1)Nd2Ga2 tetrahedra, corners with four equivalent O(2)Nd3Ga tetrahedra,  an edgeedge with one O(1)Nd2Ga2 tetrahedra, and  an edgeedge with one O(2)Nd3Ga tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Be(1), two equivalent Nd(1), and one Ga(1) atom.