Pb2MgUO6 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with six equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-25°. U(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form UO6 octahedra that share corners with six equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-25°. Pb(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one U(1), and two equivalent Pb(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mg(1), one U(1), and two equivalent Pb(1) atoms. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Mg(1), one U(1), and two equivalent Pb(1) atoms.
Pb2MgUO6 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with six equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-25°. Both Mg(1)-O(1) bond lengths are 2.14 Å. Both Mg(1)-O(2) bond lengths are 2.14 Å. Both Mg(1)-O(3) bond lengths are 2.17 Å. U(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form UO6 octahedra that share corners with six equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-25°. Both U(1)-O(1) bond lengths are 2.16 Å. Both U(1)-O(2) bond lengths are 2.11 Å. Both U(1)-O(3) bond lengths are 2.06 Å. Pb(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There is one shorter (2.52 Å) and one longer (2.66 Å) Pb(1)-O(1) bond length. There is one shorter (2.60 Å) and one longer (2.63 Å) Pb(1)-O(2) bond length. There is one shorter (2.80 Å) and one longer (2.82 Å) Pb(1)-O(3) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one U(1), and two equivalent Pb(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mg(1), one U(1), and two equivalent Pb(1) atoms. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Mg(1), one U(1), and two equivalent Pb(1) atoms.