U2O(PO4)2 crystallizes in the orthorhombic Cmce space group. U(1) is bonded to one O(1), one O(2), one O(3), and four equivalent O(4) atoms to form distorted UO7 pentagonal bipyramids that share  a cornercorner with one U(1)O7 pentagonal bipyramid, corners with four equivalent P(1)O4 tetrahedra, edges with two equivalent U(1)O7 pentagonal bipyramids, and  an edgeedge with one P(1)O4 tetrahedra. P(1) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form PO4 tetrahedra that share corners with four equivalent U(1)O7 pentagonal bipyramids and  an edgeedge with one U(1)O7 pentagonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one U(1) and one P(1) atom. In the second O site, O(2) is bonded in a linear geometry to two equivalent U(1) atoms. In the third O site, O(3) is bonded in a linear geometry to one U(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent U(1) and one P(1) atom.
U2O(PO4)2 crystallizes in the orthorhombic Cmce space group. U(1) is bonded to one O(1), one O(2), one O(3), and four equivalent O(4) atoms to form distorted UO7 pentagonal bipyramids that share  a cornercorner with one U(1)O7 pentagonal bipyramid, corners with four equivalent P(1)O4 tetrahedra, edges with two equivalent U(1)O7 pentagonal bipyramids, and  an edgeedge with one P(1)O4 tetrahedra. The U(1)-O(1) bond length is 2.22 Å. The U(1)-O(2) bond length is 2.08 Å. The U(1)-O(3) bond length is 2.26 Å. There are two shorter (2.36 Å) and two longer (2.52 Å) U(1)-O(4) bond lengths. P(1) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form PO4 tetrahedra that share corners with four equivalent U(1)O7 pentagonal bipyramids and  an edgeedge with one U(1)O7 pentagonal bipyramid. The P(1)-O(1) bond length is 1.53 Å. The P(1)-O(3) bond length is 1.51 Å. Both P(1)-O(4) bond lengths are 1.55 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one U(1) and one P(1) atom. In the second O site, O(2) is bonded in a linear geometry to two equivalent U(1) atoms. In the third O site, O(3) is bonded in a linear geometry to one U(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent U(1) and one P(1) atom.