Nd3Ga5SiO14 crystallizes in the trigonal P3 space group. Nd(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), two equivalent O(5), and two equivalent O(6) atoms. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form distorted GaO4 tetrahedra that share corners with two equivalent Ga(2)O6 octahedra,  a cornercorner with one Ga(3)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 66-68°. In the second Ga site, Ga(2) is bonded to three equivalent O(3) and three equivalent O(4) atoms to form corner-sharing GaO6 octahedra. In the third Ga site, Ga(3) is bonded to one O(1) and three equivalent O(6) atoms to form corner-sharing GaO4 tetrahedra. Si(1) is bonded to one O(2) and three equivalent O(5) atoms to form SiO4 tetrahedra that share corners with three equivalent Ga(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a tetrahedral geometry to three equivalent Nd(1) and one Ga(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to three equivalent Nd(1) and one Si(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Nd(1), one Ga(1), and one Ga(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Nd(1), one Ga(1), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Nd(1), one Ga(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Nd(1), one Ga(1), and one Ga(3) atom.
Nd3Ga5SiO14 crystallizes in the trigonal P3 space group. Nd(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), two equivalent O(5), and two equivalent O(6) atoms. The Nd(1)-O(1) bond length is 2.56 Å. The Nd(1)-O(2) bond length is 2.77 Å. The Nd(1)-O(3) bond length is 2.31 Å. The Nd(1)-O(4) bond length is 2.34 Å. There is one shorter (2.51 Å) and one longer (2.97 Å) Nd(1)-O(5) bond length. There is one shorter (2.38 Å) and one longer (2.83 Å) Nd(1)-O(6) bond length. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form distorted GaO4 tetrahedra that share corners with two equivalent Ga(2)O6 octahedra,  a cornercorner with one Ga(3)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 66-68°. The Ga(1)-O(3) bond length is 1.84 Å. The Ga(1)-O(4) bond length is 1.84 Å. The Ga(1)-O(5) bond length is 1.97 Å. The Ga(1)-O(6) bond length is 1.89 Å. In the second Ga site, Ga(2) is bonded to three equivalent O(3) and three equivalent O(4) atoms to form corner-sharing GaO6 octahedra. All Ga(2)-O(3) bond lengths are 2.03 Å. All Ga(2)-O(4) bond lengths are 2.02 Å. In the third Ga site, Ga(3) is bonded to one O(1) and three equivalent O(6) atoms to form corner-sharing GaO4 tetrahedra. The Ga(3)-O(1) bond length is 1.82 Å. All Ga(3)-O(6) bond lengths are 1.86 Å. Si(1) is bonded to one O(2) and three equivalent O(5) atoms to form SiO4 tetrahedra that share corners with three equivalent Ga(1)O4 tetrahedra. The Si(1)-O(2) bond length is 1.63 Å. All Si(1)-O(5) bond lengths are 1.66 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a tetrahedral geometry to three equivalent Nd(1) and one Ga(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to three equivalent Nd(1) and one Si(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Nd(1), one Ga(1), and one Ga(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Nd(1), one Ga(1), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Nd(1), one Ga(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Nd(1), one Ga(1), and one Ga(3) atom.