Gd2(MoO4)3 crystallizes in the tetragonal P-42_1m space group. Gd(1) is bonded to one O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted GdO7 hexagonal pyramids that share corners with two equivalent Mo(2)O4 tetrahedra, corners with five equivalent Mo(1)O4 tetrahedra, and  an edgeedge with one Gd(1)O7 hexagonal pyramid. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form MoO4 tetrahedra that share corners with five equivalent Gd(1)O7 hexagonal pyramids. In the second Mo site, Mo(2) is bonded to four equivalent O(4) atoms to form MoO4 tetrahedra that share corners with four equivalent Gd(1)O7 hexagonal pyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Gd(1) and one Mo(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Gd(1) and one Mo(1) atom. In the third O site, O(3) is bonded in a distorted linear geometry to one Gd(1) and one Mo(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Gd(1) and one Mo(2) atom.
Gd2(MoO4)3 crystallizes in the tetragonal P-42_1m space group. Gd(1) is bonded to one O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted GdO7 hexagonal pyramids that share corners with two equivalent Mo(2)O4 tetrahedra, corners with five equivalent Mo(1)O4 tetrahedra, and  an edgeedge with one Gd(1)O7 hexagonal pyramid. The Gd(1)-O(1) bond length is 2.34 Å. Both Gd(1)-O(2) bond lengths are 2.44 Å. Both Gd(1)-O(3) bond lengths are 2.35 Å. Both Gd(1)-O(4) bond lengths are 2.27 Å. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form MoO4 tetrahedra that share corners with five equivalent Gd(1)O7 hexagonal pyramids. The Mo(1)-O(1) bond length is 1.75 Å. The Mo(1)-O(2) bond length is 1.80 Å. Both Mo(1)-O(3) bond lengths are 1.75 Å. In the second Mo site, Mo(2) is bonded to four equivalent O(4) atoms to form MoO4 tetrahedra that share corners with four equivalent Gd(1)O7 hexagonal pyramids. All Mo(2)-O(4) bond lengths are 1.76 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Gd(1) and one Mo(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Gd(1) and one Mo(1) atom. In the third O site, O(3) is bonded in a distorted linear geometry to one Gd(1) and one Mo(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Gd(1) and one Mo(2) atom.