PrHoPr crystallizes in the hexagonal P-6m2 space group. There are four inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to six equivalent Ho(1), three equivalent Pr(2), and three equivalent Pr(4) atoms to form HoPr6Ho6 cuboctahedra that share corners with three equivalent Ho(3)Pr6Ho6 cuboctahedra, corners with three equivalent Pr(1)Pr12 cuboctahedra, corners with six equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with three equivalent Ho(3)Pr6Ho6 cuboctahedra, edges with three equivalent Pr(1)Pr12 cuboctahedra, edges with six equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(2)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(4)Pr9Ho3 cuboctahedra, faces with six equivalent Ho(1)Pr6Ho6 cuboctahedra, faces with six equivalent Pr(2)Pr6Ho6 cuboctahedra, and faces with six equivalent Pr(4)Pr9Ho3 cuboctahedra. In the second Ho site, Ho(2) is bonded to six equivalent Ho(2) and six equivalent Pr(3) atoms to form HoPr6Ho6 cuboctahedra that share corners with six equivalent Ho(2)Pr6Ho6 cuboctahedra, corners with six equivalent Pr(1)Pr12 cuboctahedra, edges with six equivalent Ho(2)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(1)Pr12 cuboctahedra, edges with twelve equivalent Pr(3)Pr9Ho3 cuboctahedra, faces with six equivalent Ho(2)Pr6Ho6 cuboctahedra, and faces with twelve equivalent Pr(3)Pr9Ho3 cuboctahedra. In the third Ho site, Ho(1) is bonded to six equivalent Ho(1), three equivalent Pr(2), and three equivalent Pr(4) atoms to form HoPr6Ho6 cuboctahedra that share corners with three equivalent Ho(3)Pr6Ho6 cuboctahedra, corners with three equivalent Pr(1)Pr12 cuboctahedra, corners with six equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with three equivalent Ho(3)Pr6Ho6 cuboctahedra, edges with three equivalent Pr(1)Pr12 cuboctahedra, edges with six equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(2)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(4)Pr9Ho3 cuboctahedra, faces with six equivalent Ho(1)Pr6Ho6 cuboctahedra, faces with six equivalent Pr(2)Pr6Ho6 cuboctahedra, and faces with six equivalent Pr(4)Pr9Ho3 cuboctahedra. In the fourth Ho site, Ho(3) is bonded to six equivalent Ho(3) and six equivalent Pr(2) atoms to form HoPr6Ho6 cuboctahedra that share corners with six Ho(1,1)Pr6Ho6 cuboctahedra; corners with six equivalent Ho(3)Pr6Ho6 cuboctahedra; edges with six Ho(1,1)Pr6Ho6 cuboctahedra; edges with six equivalent Ho(3)Pr6Ho6 cuboctahedra; edges with twelve equivalent Pr(2)Pr6Ho6 cuboctahedra; faces with six equivalent Ho(3)Pr6Ho6 cuboctahedra; and faces with twelve equivalent Pr(2)Pr6Ho6 cuboctahedra. There are four inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to three equivalent Pr(3), three equivalent Pr(4), and six equivalent Pr(1) atoms to form PrPr12 cuboctahedra that share corners with three equivalent Ho(1)Pr6Ho6 cuboctahedra, corners with three equivalent Ho(2)Pr6Ho6 cuboctahedra, corners with six equivalent Pr(1)Pr12 cuboctahedra, edges with three equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with three equivalent Ho(2)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(1)Pr12 cuboctahedra, edges with six equivalent Pr(3)Pr9Ho3 cuboctahedra, edges with six equivalent Pr(4)Pr9Ho3 cuboctahedra, faces with six equivalent Pr(1)Pr12 cuboctahedra, faces with six equivalent Pr(3)Pr9Ho3 cuboctahedra, and faces with six equivalent Pr(4)Pr9Ho3 cuboctahedra. In the second Pr site, Pr(2) is bonded to three equivalent Ho(1), three equivalent Ho(3), and six equivalent Pr(2) atoms to form PrPr6Ho6 cuboctahedra that share corners with six equivalent Pr(4)Pr9Ho3 cuboctahedra, corners with twelve equivalent Pr(2)Pr6Ho6 cuboctahedra, edges with six equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with six equivalent Ho(3)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(2)Pr6Ho6 cuboctahedra,  a faceface with one Pr(4)Pr9Ho3 cuboctahedra, faces with six equivalent Ho(1)Pr6Ho6 cuboctahedra, faces with six equivalent Ho(3)Pr6Ho6 cuboctahedra, and faces with seven equivalent Pr(2)Pr6Ho6 cuboctahedra. In the third Pr site, Pr(3) is bonded to three equivalent Ho(2), three equivalent Pr(1), and six equivalent Pr(3) atoms to form PrPr9Ho3 cuboctahedra that share corners with six equivalent Pr(4)Pr9Ho3 cuboctahedra, corners with twelve equivalent Pr(3)Pr9Ho3 cuboctahedra, edges with six equivalent Ho(2)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(1)Pr12 cuboctahedra, edges with six equivalent Pr(3)Pr9Ho3 cuboctahedra,  a faceface with one Pr(4)Pr9Ho3 cuboctahedra, faces with six equivalent Ho(2)Pr6Ho6 cuboctahedra, faces with six equivalent Pr(1)Pr12 cuboctahedra, and faces with seven equivalent Pr(3)Pr9Ho3 cuboctahedra. In the fourth Pr site, Pr(4) is bonded to three equivalent Ho(1), three equivalent Pr(1), and six equivalent Pr(4) atoms to form PrPr9Ho3 cuboctahedra that share corners with six equivalent Pr(2)Pr6Ho6 cuboctahedra, corners with six equivalent Pr(3)Pr9Ho3 cuboctahedra, corners with six equivalent Pr(4)Pr9Ho3 cuboctahedra, edges with six equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(1)Pr12 cuboctahedra, edges with six equivalent Pr(4)Pr9Ho3 cuboctahedra,  a faceface with one Pr(2)Pr6Ho6 cuboctahedra,  a faceface with one Pr(3)Pr9Ho3 cuboctahedra, faces with six equivalent Ho(1)Pr6Ho6 cuboctahedra, faces with six equivalent Pr(1)Pr12 cuboctahedra, and faces with six equivalent Pr(4)Pr9Ho3 cuboctahedra.
PrHoPr crystallizes in the hexagonal P-6m2 space group. There are four inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to six equivalent Ho(1), three equivalent Pr(2), and three equivalent Pr(4) atoms to form HoPr6Ho6 cuboctahedra that share corners with three equivalent Ho(3)Pr6Ho6 cuboctahedra, corners with three equivalent Pr(1)Pr12 cuboctahedra, corners with six equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with three equivalent Ho(3)Pr6Ho6 cuboctahedra, edges with three equivalent Pr(1)Pr12 cuboctahedra, edges with six equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(2)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(4)Pr9Ho3 cuboctahedra, faces with six equivalent Ho(1)Pr6Ho6 cuboctahedra, faces with six equivalent Pr(2)Pr6Ho6 cuboctahedra, and faces with six equivalent Pr(4)Pr9Ho3 cuboctahedra. All Ho(1)-Ho(1) bond lengths are 3.67 Å. All Ho(1)-Pr(2) bond lengths are 3.60 Å. All Ho(1)-Pr(4) bond lengths are 3.59 Å. In the second Ho site, Ho(2) is bonded to six equivalent Ho(2) and six equivalent Pr(3) atoms to form HoPr6Ho6 cuboctahedra that share corners with six equivalent Ho(2)Pr6Ho6 cuboctahedra, corners with six equivalent Pr(1)Pr12 cuboctahedra, edges with six equivalent Ho(2)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(1)Pr12 cuboctahedra, edges with twelve equivalent Pr(3)Pr9Ho3 cuboctahedra, faces with six equivalent Ho(2)Pr6Ho6 cuboctahedra, and faces with twelve equivalent Pr(3)Pr9Ho3 cuboctahedra. All Ho(2)-Ho(2) bond lengths are 3.67 Å. All Ho(2)-Pr(3) bond lengths are 3.58 Å. In the third Ho site, Ho(1) is bonded to six equivalent Ho(1), three equivalent Pr(2), and three equivalent Pr(4) atoms to form HoPr6Ho6 cuboctahedra that share corners with three equivalent Ho(3)Pr6Ho6 cuboctahedra, corners with three equivalent Pr(1)Pr12 cuboctahedra, corners with six equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with three equivalent Ho(3)Pr6Ho6 cuboctahedra, edges with three equivalent Pr(1)Pr12 cuboctahedra, edges with six equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(2)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(4)Pr9Ho3 cuboctahedra, faces with six equivalent Ho(1)Pr6Ho6 cuboctahedra, faces with six equivalent Pr(2)Pr6Ho6 cuboctahedra, and faces with six equivalent Pr(4)Pr9Ho3 cuboctahedra. All Ho(1)-Ho(1) bond lengths are 3.67 Å. All Ho(1)-Pr(2) bond lengths are 3.60 Å. All Ho(1)-Pr(4) bond lengths are 3.59 Å. In the fourth Ho site, Ho(3) is bonded to six equivalent Ho(3) and six equivalent Pr(2) atoms to form HoPr6Ho6 cuboctahedra that share corners with six Ho(1,1)Pr6Ho6 cuboctahedra; corners with six equivalent Ho(3)Pr6Ho6 cuboctahedra; edges with six Ho(1,1)Pr6Ho6 cuboctahedra; edges with six equivalent Ho(3)Pr6Ho6 cuboctahedra; edges with twelve equivalent Pr(2)Pr6Ho6 cuboctahedra; faces with six equivalent Ho(3)Pr6Ho6 cuboctahedra; and faces with twelve equivalent Pr(2)Pr6Ho6 cuboctahedra. All Ho(3)-Ho(3) bond lengths are 3.67 Å. All Ho(3)-Pr(2) bond lengths are 3.60 Å. There are four inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to three equivalent Pr(3), three equivalent Pr(4), and six equivalent Pr(1) atoms to form PrPr12 cuboctahedra that share corners with three equivalent Ho(1)Pr6Ho6 cuboctahedra, corners with three equivalent Ho(2)Pr6Ho6 cuboctahedra, corners with six equivalent Pr(1)Pr12 cuboctahedra, edges with three equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with three equivalent Ho(2)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(1)Pr12 cuboctahedra, edges with six equivalent Pr(3)Pr9Ho3 cuboctahedra, edges with six equivalent Pr(4)Pr9Ho3 cuboctahedra, faces with six equivalent Pr(1)Pr12 cuboctahedra, faces with six equivalent Pr(3)Pr9Ho3 cuboctahedra, and faces with six equivalent Pr(4)Pr9Ho3 cuboctahedra. All Pr(1)-Pr(3) bond lengths are 3.70 Å. All Pr(1)-Pr(4) bond lengths are 3.72 Å. All Pr(1)-Pr(1) bond lengths are 3.67 Å. In the second Pr site, Pr(2) is bonded to three equivalent Ho(1), three equivalent Ho(3), and six equivalent Pr(2) atoms to form PrPr6Ho6 cuboctahedra that share corners with six equivalent Pr(4)Pr9Ho3 cuboctahedra, corners with twelve equivalent Pr(2)Pr6Ho6 cuboctahedra, edges with six equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with six equivalent Ho(3)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(2)Pr6Ho6 cuboctahedra,  a faceface with one Pr(4)Pr9Ho3 cuboctahedra, faces with six equivalent Ho(1)Pr6Ho6 cuboctahedra, faces with six equivalent Ho(3)Pr6Ho6 cuboctahedra, and faces with seven equivalent Pr(2)Pr6Ho6 cuboctahedra. All Pr(2)-Pr(2) bond lengths are 3.67 Å. In the third Pr site, Pr(3) is bonded to three equivalent Ho(2), three equivalent Pr(1), and six equivalent Pr(3) atoms to form PrPr9Ho3 cuboctahedra that share corners with six equivalent Pr(4)Pr9Ho3 cuboctahedra, corners with twelve equivalent Pr(3)Pr9Ho3 cuboctahedra, edges with six equivalent Ho(2)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(1)Pr12 cuboctahedra, edges with six equivalent Pr(3)Pr9Ho3 cuboctahedra,  a faceface with one Pr(4)Pr9Ho3 cuboctahedra, faces with six equivalent Ho(2)Pr6Ho6 cuboctahedra, faces with six equivalent Pr(1)Pr12 cuboctahedra, and faces with seven equivalent Pr(3)Pr9Ho3 cuboctahedra. All Pr(3)-Pr(3) bond lengths are 3.67 Å. In the fourth Pr site, Pr(4) is bonded to three equivalent Ho(1), three equivalent Pr(1), and six equivalent Pr(4) atoms to form PrPr9Ho3 cuboctahedra that share corners with six equivalent Pr(2)Pr6Ho6 cuboctahedra, corners with six equivalent Pr(3)Pr9Ho3 cuboctahedra, corners with six equivalent Pr(4)Pr9Ho3 cuboctahedra, edges with six equivalent Ho(1)Pr6Ho6 cuboctahedra, edges with six equivalent Pr(1)Pr12 cuboctahedra, edges with six equivalent Pr(4)Pr9Ho3 cuboctahedra,  a faceface with one Pr(2)Pr6Ho6 cuboctahedra,  a faceface with one Pr(3)Pr9Ho3 cuboctahedra, faces with six equivalent Ho(1)Pr6Ho6 cuboctahedra, faces with six equivalent Pr(1)Pr12 cuboctahedra, and faces with six equivalent Pr(4)Pr9Ho3 cuboctahedra. All Pr(4)-Pr(4) bond lengths are 3.67 Å.