K2Pb2Ge2O7 crystallizes in the trigonal P-3 space group. K(1) is bonded in a 9-coordinate geometry to nine equivalent O(1) atoms. Pb(1) is bonded in a distorted T-shaped geometry to three equivalent O(1) atoms. Ge(1) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing GeO4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to three equivalent K(1), one Pb(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a linear geometry to two equivalent Ge(1) atoms.
K2Pb2Ge2O7 crystallizes in the trigonal P-3 space group. K(1) is bonded in a 9-coordinate geometry to nine equivalent O(1) atoms. There are a spread of K(1)-O(1) bond distances ranging from 2.91-3.21 Å. Pb(1) is bonded in a distorted T-shaped geometry to three equivalent O(1) atoms. All Pb(1)-O(1) bond lengths are 2.22 Å. Ge(1) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing GeO4 tetrahedra. The Ge(1)-O(2) bond length is 1.81 Å. All Ge(1)-O(1) bond lengths are 1.77 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to three equivalent K(1), one Pb(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a linear geometry to two equivalent Ge(1) atoms.