Gd2Rh12P7 crystallizes in the trigonal P-3 space group. Gd(1) is bonded to six equivalent Rh(1) and six equivalent P(2) atoms to form distorted GdP6Rh6 cuboctahedra that share corners with twelve equivalent Rh(2)P4 tetrahedra, edges with three equivalent Rh(2)P4 tetrahedra, and faces with two equivalent Gd(1)P6Rh6 cuboctahedra. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 6-coordinate geometry to two equivalent Gd(1) and four equivalent P(2) atoms. In the second Rh site, Rh(2) is bonded to one P(1) and three equivalent P(2) atoms to form distorted RhP4 tetrahedra that share corners with four equivalent Gd(1)P6Rh6 cuboctahedra, corners with seven equivalent Rh(2)P4 tetrahedra,  an edgeedge with one Gd(1)P6Rh6 cuboctahedra, and edges with two equivalent Rh(2)P4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded in a distorted octahedral geometry to six equivalent Rh(2) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Gd(1), three equivalent Rh(2), and four equivalent Rh(1) atoms.
Gd2Rh12P7 crystallizes in the trigonal P-3 space group. Gd(1) is bonded to six equivalent Rh(1) and six equivalent P(2) atoms to form distorted GdP6Rh6 cuboctahedra that share corners with twelve equivalent Rh(2)P4 tetrahedra, edges with three equivalent Rh(2)P4 tetrahedra, and faces with two equivalent Gd(1)P6Rh6 cuboctahedra. All Gd(1)-Rh(1) bond lengths are 3.06 Å. There are three shorter (3.03 Å) and three longer (3.05 Å) Gd(1)-P(2) bond lengths. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 6-coordinate geometry to two equivalent Gd(1) and four equivalent P(2) atoms. There are a spread of Rh(1)-P(2) bond distances ranging from 2.35-2.58 Å. In the second Rh site, Rh(2) is bonded to one P(1) and three equivalent P(2) atoms to form distorted RhP4 tetrahedra that share corners with four equivalent Gd(1)P6Rh6 cuboctahedra, corners with seven equivalent Rh(2)P4 tetrahedra,  an edgeedge with one Gd(1)P6Rh6 cuboctahedra, and edges with two equivalent Rh(2)P4 tetrahedra. The Rh(2)-P(1) bond length is 2.39 Å. There are a spread of Rh(2)-P(2) bond distances ranging from 2.34-2.49 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a distorted octahedral geometry to six equivalent Rh(2) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Gd(1), three equivalent Rh(2), and four equivalent Rh(1) atoms.