Pr8CoGa3 crystallizes in the hexagonal P6_3mc space group. There are four inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one Co(1) and four equivalent Ga(1) atoms to form distorted PrGa4Co trigonal pyramids that share corners with two equivalent Pr(4)Ga6 octahedra, corners with three equivalent Pr(2)Ga3Co tetrahedra, corners with six equivalent Pr(1)Ga4Co trigonal pyramids,  an edgeedge with one Pr(2)Ga3Co tetrahedra, edges with four equivalent Pr(1)Ga4Co trigonal pyramids, and faces with two equivalent Pr(4)Ga6 octahedra. The corner-sharing octahedral tilt angles range from 56-59°. In the second Pr site, Pr(2) is bonded to one Co(1) and three equivalent Ga(1) atoms to form distorted PrGa3Co tetrahedra that share corners with six equivalent Pr(4)Ga6 octahedra, corners with nine equivalent Pr(1)Ga4Co trigonal pyramids, and edges with three equivalent Pr(1)Ga4Co trigonal pyramids. The corner-sharing octahedral tilt angles range from 15-47°. In the third Pr site, Pr(3) is bonded in a 3-coordinate geometry to one Co(1) and four equivalent Ga(1) atoms. In the fourth Pr site, Pr(4) is bonded to six equivalent Ga(1) atoms to form distorted PrGa6 octahedra that share corners with six equivalent Pr(2)Ga3Co tetrahedra, corners with six equivalent Pr(1)Ga4Co trigonal pyramids, faces with two equivalent Pr(4)Ga6 octahedra, and faces with six equivalent Pr(1)Ga4Co trigonal pyramids. Co(1) is bonded in a 7-coordinate geometry to one Pr(2), three equivalent Pr(1), and three equivalent Pr(3) atoms. Ga(1) is bonded in a 11-coordinate geometry to one Pr(2), two equivalent Pr(4), four equivalent Pr(1), and four equivalent Pr(3) atoms.
Pr8CoGa3 crystallizes in the hexagonal P6_3mc space group. There are four inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one Co(1) and four equivalent Ga(1) atoms to form distorted PrGa4Co trigonal pyramids that share corners with two equivalent Pr(4)Ga6 octahedra, corners with three equivalent Pr(2)Ga3Co tetrahedra, corners with six equivalent Pr(1)Ga4Co trigonal pyramids,  an edgeedge with one Pr(2)Ga3Co tetrahedra, edges with four equivalent Pr(1)Ga4Co trigonal pyramids, and faces with two equivalent Pr(4)Ga6 octahedra. The corner-sharing octahedral tilt angles range from 56-59°. The Pr(1)-Co(1) bond length is 3.00 Å. There are a spread of Pr(1)-Ga(1) bond distances ranging from 3.07-3.88 Å. In the second Pr site, Pr(2) is bonded to one Co(1) and three equivalent Ga(1) atoms to form distorted PrGa3Co tetrahedra that share corners with six equivalent Pr(4)Ga6 octahedra, corners with nine equivalent Pr(1)Ga4Co trigonal pyramids, and edges with three equivalent Pr(1)Ga4Co trigonal pyramids. The corner-sharing octahedral tilt angles range from 15-47°. The Pr(2)-Co(1) bond length is 2.76 Å. All Pr(2)-Ga(1) bond lengths are 3.22 Å. In the third Pr site, Pr(3) is bonded in a 3-coordinate geometry to one Co(1) and four equivalent Ga(1) atoms. The Pr(3)-Co(1) bond length is 2.87 Å. There are two shorter (3.29 Å) and two longer (3.88 Å) Pr(3)-Ga(1) bond lengths. In the fourth Pr site, Pr(4) is bonded to six equivalent Ga(1) atoms to form distorted PrGa6 octahedra that share corners with six equivalent Pr(2)Ga3Co tetrahedra, corners with six equivalent Pr(1)Ga4Co trigonal pyramids, faces with two equivalent Pr(4)Ga6 octahedra, and faces with six equivalent Pr(1)Ga4Co trigonal pyramids. There are three shorter (3.44 Å) and three longer (3.53 Å) Pr(4)-Ga(1) bond lengths. Co(1) is bonded in a 7-coordinate geometry to one Pr(2), three equivalent Pr(1), and three equivalent Pr(3) atoms. Ga(1) is bonded in a 11-coordinate geometry to one Pr(2), two equivalent Pr(4), four equivalent Pr(1), and four equivalent Pr(3) atoms.