Pb3GeGa10O20 crystallizes in the monoclinic C2/m space group. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form GaO6 octahedra that share corners with two equivalent Ga(2)O4 tetrahedra, corners with four equivalent Ga(3)O4 tetrahedra,  an edgeedge with one Ga(1)O6 octahedra, and edges with two equivalent Ge(1)O6 octahedra. In the second Ga site, Ga(2) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(1)O6 octahedra, corners with two equivalent Pb(1)O6 octahedra,  a cornercorner with one Ga(2)O4 tetrahedra, and corners with three equivalent Ga(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-76°. In the third Ga site, Ga(3) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Pb(1)O6 octahedra,  a cornercorner with one Ge(1)O6 octahedra, corners with two equivalent Ga(1)O6 octahedra, and corners with three equivalent Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-63°. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to two equivalent O(2) and four equivalent O(5) atoms to form distorted PbO6 octahedra that share corners with four equivalent Ga(3)O4 tetrahedra and corners with eight equivalent Ga(2)O4 tetrahedra. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one O(1) and two equivalent O(3) atoms. Ge(1) is bonded to two equivalent O(1) and four equivalent O(6) atoms to form GeO6 octahedra that share corners with four equivalent Ga(3)O4 tetrahedra and edges with four equivalent Ga(1)O6 octahedra. There are six inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Ga(2), one Ga(3), and one Pb(2) atom. In the second O site, O(4) is bonded in a trigonal planar geometry to one Ga(1), one Ga(2), and one Ga(3) atom. In the third O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ga(2), one Ga(3), and one Pb(1) atom. In the fourth O site, O(6) is bonded in a trigonal planar geometry to one Ga(1), one Ga(3), and one Ge(1) atom. In the fifth O site, O(1) is bonded to two equivalent Ga(1), one Pb(2), and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OGa2GePb tetrahedra. In the sixth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Ga(2) and one Pb(1) atom.
Pb3GeGa10O20 crystallizes in the monoclinic C2/m space group. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form GaO6 octahedra that share corners with two equivalent Ga(2)O4 tetrahedra, corners with four equivalent Ga(3)O4 tetrahedra,  an edgeedge with one Ga(1)O6 octahedra, and edges with two equivalent Ge(1)O6 octahedra. Both Ga(1)-O(1) bond lengths are 2.07 Å. Both Ga(1)-O(4) bond lengths are 1.94 Å. Both Ga(1)-O(6) bond lengths are 1.97 Å. In the second Ga site, Ga(2) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(1)O6 octahedra, corners with two equivalent Pb(1)O6 octahedra,  a cornercorner with one Ga(2)O4 tetrahedra, and corners with three equivalent Ga(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-76°. The Ga(2)-O(2) bond length is 1.84 Å. The Ga(2)-O(3) bond length is 1.85 Å. The Ga(2)-O(4) bond length is 1.86 Å. The Ga(2)-O(5) bond length is 1.83 Å. In the third Ga site, Ga(3) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Pb(1)O6 octahedra,  a cornercorner with one Ge(1)O6 octahedra, corners with two equivalent Ga(1)O6 octahedra, and corners with three equivalent Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-63°. The Ga(3)-O(3) bond length is 1.84 Å. The Ga(3)-O(4) bond length is 1.87 Å. The Ga(3)-O(5) bond length is 1.84 Å. The Ga(3)-O(6) bond length is 1.84 Å. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to two equivalent O(2) and four equivalent O(5) atoms to form distorted PbO6 octahedra that share corners with four equivalent Ga(3)O4 tetrahedra and corners with eight equivalent Ga(2)O4 tetrahedra. Both Pb(1)-O(2) bond lengths are 2.51 Å. All Pb(1)-O(5) bond lengths are 2.72 Å. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one O(1) and two equivalent O(3) atoms. The Pb(2)-O(1) bond length is 2.40 Å. Both Pb(2)-O(3) bond lengths are 2.36 Å. Ge(1) is bonded to two equivalent O(1) and four equivalent O(6) atoms to form GeO6 octahedra that share corners with four equivalent Ga(3)O4 tetrahedra and edges with four equivalent Ga(1)O6 octahedra. Both Ge(1)-O(1) bond lengths are 1.90 Å. All Ge(1)-O(6) bond lengths are 1.90 Å. There are six inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Ga(2), one Ga(3), and one Pb(2) atom. In the second O site, O(4) is bonded in a trigonal planar geometry to one Ga(1), one Ga(2), and one Ga(3) atom. In the third O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ga(2), one Ga(3), and one Pb(1) atom. In the fourth O site, O(6) is bonded in a trigonal planar geometry to one Ga(1), one Ga(3), and one Ge(1) atom. In the fifth O site, O(1) is bonded to two equivalent Ga(1), one Pb(2), and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OGa2GePb tetrahedra. In the sixth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Ga(2) and one Pb(1) atom.