FePbGe3H4O10 crystallizes in the monoclinic P2_1/m space group. Fe(1) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with two equivalent Pb(1)O6 octahedra, corners with four equivalent Ge(2)O4 tetrahedra, and edges with two equivalent Ge(1)O6 octahedra. The corner-sharing octahedral tilt angles are 69°. Pb(1) is bonded to one O(1), one O(6), two equivalent O(2), and two equivalent O(3) atoms to form distorted PbO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Ge(1)O6 octahedra, and corners with six equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 63-69°. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form GeO6 octahedra that share corners with two equivalent Pb(1)O6 octahedra, corners with four equivalent Ge(2)O4 tetrahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 63°. In the second Ge site, Ge(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Ge(1)O6 octahedra, corners with three equivalent Pb(1)O6 octahedra, and  a cornercorner with one Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-68°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to one Fe(1), one Ge(1), and one H(1) atom. In the second O site, O(6) is bonded in a water-like geometry to one Pb(1) and two equivalent H(2) atoms. In the third O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Pb(1) and two equivalent Ge(2) atoms. In the fourth O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Pb(1), one Ge(1), and one Ge(2) atom. In the fifth O site, O(3) is bonded in a 2-coordinate geometry to one Fe(1), one Pb(1), and one Ge(2) atom. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to one Fe(1), one Ge(1), and one Ge(2) atom.
FePbGe3H4O10 crystallizes in the monoclinic P2_1/m space group. Fe(1) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with two equivalent Pb(1)O6 octahedra, corners with four equivalent Ge(2)O4 tetrahedra, and edges with two equivalent Ge(1)O6 octahedra. The corner-sharing octahedral tilt angles are 69°. Both Fe(1)-O(3) bond lengths are 2.10 Å. Both Fe(1)-O(4) bond lengths are 2.25 Å. Both Fe(1)-O(5) bond lengths are 2.16 Å. Pb(1) is bonded to one O(1), one O(6), two equivalent O(2), and two equivalent O(3) atoms to form distorted PbO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Ge(1)O6 octahedra, and corners with six equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 63-69°. The Pb(1)-O(1) bond length is 2.78 Å. The Pb(1)-O(6) bond length is 2.62 Å. Both Pb(1)-O(2) bond lengths are 2.67 Å. Both Pb(1)-O(3) bond lengths are 2.52 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form GeO6 octahedra that share corners with two equivalent Pb(1)O6 octahedra, corners with four equivalent Ge(2)O4 tetrahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 63°. Both Ge(1)-O(2) bond lengths are 1.95 Å. Both Ge(1)-O(4) bond lengths are 1.93 Å. Both Ge(1)-O(5) bond lengths are 1.90 Å. In the second Ge site, Ge(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Ge(1)O6 octahedra, corners with three equivalent Pb(1)O6 octahedra, and  a cornercorner with one Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-68°. The Ge(2)-O(1) bond length is 1.79 Å. The Ge(2)-O(2) bond length is 1.77 Å. The Ge(2)-O(3) bond length is 1.77 Å. The Ge(2)-O(4) bond length is 1.80 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 1.00 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. The H(2)-O(6) bond length is 0.99 Å. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to one Fe(1), one Ge(1), and one H(1) atom. In the second O site, O(6) is bonded in a water-like geometry to one Pb(1) and two equivalent H(2) atoms. In the third O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Pb(1) and two equivalent Ge(2) atoms. In the fourth O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Pb(1), one Ge(1), and one Ge(2) atom. In the fifth O site, O(3) is bonded in a 2-coordinate geometry to one Fe(1), one Pb(1), and one Ge(2) atom. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to one Fe(1), one Ge(1), and one Ge(2) atom.