Ho2Fe17C crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Fe(10), two equivalent Fe(14), two equivalent Fe(3), two equivalent Fe(7), four equivalent Fe(13), and two equivalent C(1) atoms. In the second Ho site, Ho(2) is bonded in a 20-coordinate geometry to two equivalent Fe(12), two equivalent Fe(14), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), two equivalent Fe(8), four equivalent Fe(11), and four equivalent Fe(13) atoms. In the third Ho site, Ho(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Fe(10), two equivalent Fe(12), two equivalent Fe(3), four equivalent Fe(11), and two equivalent C(1) atoms. In the fourth Ho site, Ho(4) is bonded in a 18-coordinate geometry to two equivalent Fe(10), two equivalent Fe(12), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), four equivalent Fe(11), and four equivalent Fe(9) atoms. There are fourteen inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a single-bond geometry to one Fe(3), two equivalent Fe(12), two equivalent Fe(13), two equivalent Fe(8), and one C(1) atom. In the second Fe site, Fe(2) is bonded in a single-bond geometry to one Fe(3), two equivalent Fe(11), two equivalent Fe(14), two equivalent Fe(8), and one C(1) atom. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to one Ho(1), one Ho(3), one Fe(1), one Fe(2), two equivalent Fe(10), two equivalent Fe(11), two equivalent Fe(13), and two equivalent Fe(8) atoms. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Ho(2), one Ho(4), one Fe(4), one Fe(6), two equivalent Fe(10), two equivalent Fe(11), two equivalent Fe(13), and two equivalent Fe(7) atoms. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to one Ho(2), one Ho(4), one Fe(5), one Fe(6), two equivalent Fe(11), two equivalent Fe(14), two equivalent Fe(7), and two equivalent Fe(9) atoms. In the sixth Fe site, Fe(6) is bonded in a 12-coordinate geometry to one Ho(2), one Ho(4), one Fe(4), one Fe(5), two equivalent Fe(12), two equivalent Fe(13), two equivalent Fe(7), and two equivalent Fe(9) atoms. In the seventh Fe site, Fe(7) is bonded in a 14-coordinate geometry to one Ho(1), one Fe(10), one Fe(14), one Fe(7), two equivalent Fe(13), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), and two equivalent Fe(9) atoms. In the eighth Fe site, Fe(8) is bonded in a 14-coordinate geometry to one Ho(2), one Fe(12), one Fe(14), one Fe(8), two equivalent Fe(1), two equivalent Fe(11), two equivalent Fe(13), two equivalent Fe(2), and two equivalent Fe(3) atoms. In the ninth Fe site, Fe(9) is bonded in a single-bond geometry to one Ho(4), one Fe(11), one Fe(12), one Fe(13), one Fe(14), one Fe(5), one Fe(6), one Fe(7), and one C(1) atom. In the tenth Fe site, Fe(10) is bonded to one Ho(1), one Ho(3), one Ho(4), one Fe(7), two equivalent Fe(11), two equivalent Fe(13), two equivalent Fe(3), and two equivalent Fe(4) atoms to form distorted FeHo3Fe9 cuboctahedra that share corners with two equivalent Fe(13)Ho2Fe10 cuboctahedra, corners with three equivalent Fe(14)Ho2Fe10 cuboctahedra, corners with four equivalent Fe(12)Ho3Fe9 cuboctahedra, corners with four equivalent C(1)Ho2Fe4 octahedra,  an edgeedge with one Fe(14)Ho2Fe10 cuboctahedra,  an edgeedge with one Fe(12)Ho3Fe9 cuboctahedra, edges with two equivalent Fe(13)Ho2Fe10 cuboctahedra, edges with four equivalent Fe(11)Ho3Fe9 cuboctahedra, faces with two equivalent Fe(13)Ho2Fe10 cuboctahedra, faces with two equivalent Fe(10)Ho3Fe9 cuboctahedra, and faces with two equivalent Fe(11)Ho3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles are 66°. In the eleventh Fe site, Fe(11) is bonded to one Ho(2), one Ho(3), one Ho(4), one Fe(10), one Fe(13), one Fe(14), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(8), and one Fe(9) atom to form distorted FeHo3Fe9 cuboctahedra that share  a cornercorner with one Fe(14)Ho2Fe10 cuboctahedra, corners with three equivalent Fe(11)Ho3Fe9 cuboctahedra, corners with three equivalent Fe(12)Ho3Fe9 cuboctahedra, corners with four equivalent Fe(13)Ho2Fe10 cuboctahedra,  a cornercorner with one C(1)Ho2Fe4 octahedra,  an edgeedge with one Fe(14)Ho2Fe10 cuboctahedra, edges with two equivalent Fe(13)Ho2Fe10 cuboctahedra, edges with two equivalent Fe(10)Ho3Fe9 cuboctahedra,  a faceface with one Fe(13)Ho2Fe10 cuboctahedra,  a faceface with one Fe(14)Ho2Fe10 cuboctahedra,  a faceface with one Fe(10)Ho3Fe9 cuboctahedra, faces with two equivalent Fe(12)Ho3Fe9 cuboctahedra, faces with four equivalent Fe(11)Ho3Fe9 cuboctahedra, and  a faceface with one C(1)Ho2Fe4 octahedra. The corner-sharing octahedral tilt angles are 42°. In the twelfth Fe site, Fe(12) is bonded to one Ho(2), one Ho(3), one Ho(4), one Fe(8), two equivalent Fe(1), two equivalent Fe(13), two equivalent Fe(6), and two equivalent Fe(9) atoms to form distorted FeHo3Fe9 cuboctahedra that share corners with two equivalent Fe(13)Ho2Fe10 cuboctahedra, corners with three equivalent Fe(14)Ho2Fe10 cuboctahedra, corners with four equivalent Fe(10)Ho3Fe9 cuboctahedra, corners with six equivalent Fe(11)Ho3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Ho2Fe10 cuboctahedra,  an edgeedge with one Fe(10)Ho3Fe9 cuboctahedra, edges with two equivalent Fe(13)Ho2Fe10 cuboctahedra, faces with two equivalent Fe(13)Ho2Fe10 cuboctahedra, faces with two equivalent Fe(12)Ho3Fe9 cuboctahedra, faces with four equivalent Fe(11)Ho3Fe9 cuboctahedra, and faces with two equivalent C(1)Ho2Fe4 octahedra. In the thirteenth Fe site, Fe(13) is bonded to one Ho(1), one Ho(2), one Fe(1), one Fe(10), one Fe(11), one Fe(12), one Fe(3), one Fe(4), one Fe(6), one Fe(7), one Fe(8), and one Fe(9) atom to form FeHo2Fe10 cuboctahedra that share  a cornercorner with one Fe(10)Ho3Fe9 cuboctahedra,  a cornercorner with one Fe(12)Ho3Fe9 cuboctahedra, corners with two equivalent Fe(13)Ho2Fe10 cuboctahedra, corners with two equivalent Fe(14)Ho2Fe10 cuboctahedra, corners with four equivalent Fe(11)Ho3Fe9 cuboctahedra,  a cornercorner with one C(1)Ho2Fe4 octahedra,  an edgeedge with one Fe(10)Ho3Fe9 cuboctahedra,  an edgeedge with one Fe(12)Ho3Fe9 cuboctahedra, edges with two equivalent Fe(11)Ho3Fe9 cuboctahedra,  a faceface with one Fe(10)Ho3Fe9 cuboctahedra,  a faceface with one Fe(11)Ho3Fe9 cuboctahedra,  a faceface with one Fe(12)Ho3Fe9 cuboctahedra, faces with two equivalent Fe(14)Ho2Fe10 cuboctahedra, faces with four equivalent Fe(13)Ho2Fe10 cuboctahedra, and  a faceface with one C(1)Ho2Fe4 octahedra. The corner-sharing octahedral tilt angles are 40°. In the fourteenth Fe site, Fe(14) is bonded to one Ho(1), one Ho(2), one Fe(7), one Fe(8), two equivalent Fe(11), two equivalent Fe(2), two equivalent Fe(5), and two equivalent Fe(9) atoms to form FeHo2Fe10 cuboctahedra that share corners with two equivalent Fe(11)Ho3Fe9 cuboctahedra, corners with three equivalent Fe(10)Ho3Fe9 cuboctahedra, corners with three equivalent Fe(12)Ho3Fe9 cuboctahedra, corners with four equivalent Fe(13)Ho2Fe10 cuboctahedra,  an edgeedge with one Fe(10)Ho3Fe9 cuboctahedra,  an edgeedge with one Fe(12)Ho3Fe9 cuboctahedra, edges with two equivalent Fe(11)Ho3Fe9 cuboctahedra, faces with two equivalent Fe(14)Ho2Fe10 cuboctahedra, faces with two equivalent Fe(11)Ho3Fe9 cuboctahedra, faces with four equivalent Fe(13)Ho2Fe10 cuboctahedra, and faces with two equivalent C(1)Ho2Fe4 octahedra. C(1) is bonded to one Ho(1), one Ho(3), one Fe(1), one Fe(2), and two equivalent Fe(9) atoms to form CHo2Fe4 octahedra that share corners with two equivalent Fe(13)Ho2Fe10 cuboctahedra, corners with two equivalent Fe(11)Ho3Fe9 cuboctahedra, corners with four equivalent Fe(10)Ho3Fe9 cuboctahedra, corners with two equivalent C(1)Ho2Fe4 octahedra, faces with two equivalent Fe(13)Ho2Fe10 cuboctahedra, faces with two equivalent Fe(14)Ho2Fe10 cuboctahedra, faces with two equivalent Fe(11)Ho3Fe9 cuboctahedra, and faces with two equivalent Fe(12)Ho3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles range from 61-62°.
Ho2Fe17C crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Fe(10), two equivalent Fe(14), two equivalent Fe(3), two equivalent Fe(7), four equivalent Fe(13), and two equivalent C(1) atoms. Both Ho(1)-Fe(10) bond lengths are 3.10 Å. Both Ho(1)-Fe(14) bond lengths are 3.28 Å. Both Ho(1)-Fe(3) bond lengths are 3.03 Å. Both Ho(1)-Fe(7) bond lengths are 2.94 Å. All Ho(1)-Fe(13) bond lengths are 3.22 Å. Both Ho(1)-C(1) bond lengths are 2.50 Å. In the second Ho site, Ho(2) is bonded in a 20-coordinate geometry to two equivalent Fe(12), two equivalent Fe(14), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), two equivalent Fe(8), four equivalent Fe(11), and four equivalent Fe(13) atoms. Both Ho(2)-Fe(12) bond lengths are 3.10 Å. Both Ho(2)-Fe(14) bond lengths are 3.18 Å. Both Ho(2)-Fe(4) bond lengths are 3.04 Å. Both Ho(2)-Fe(5) bond lengths are 3.06 Å. Both Ho(2)-Fe(6) bond lengths are 3.06 Å. Both Ho(2)-Fe(8) bond lengths are 2.93 Å. All Ho(2)-Fe(11) bond lengths are 3.11 Å. All Ho(2)-Fe(13) bond lengths are 3.19 Å. In the third Ho site, Ho(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Fe(10), two equivalent Fe(12), two equivalent Fe(3), four equivalent Fe(11), and two equivalent C(1) atoms. Both Ho(3)-Fe(10) bond lengths are 3.08 Å. Both Ho(3)-Fe(12) bond lengths are 3.37 Å. Both Ho(3)-Fe(3) bond lengths are 2.97 Å. All Ho(3)-Fe(11) bond lengths are 3.30 Å. Both Ho(3)-C(1) bond lengths are 2.46 Å. In the fourth Ho site, Ho(4) is bonded in a 18-coordinate geometry to two equivalent Fe(10), two equivalent Fe(12), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), four equivalent Fe(11), and four equivalent Fe(9) atoms. Both Ho(4)-Fe(10) bond lengths are 3.31 Å. Both Ho(4)-Fe(12) bond lengths are 3.12 Å. Both Ho(4)-Fe(4) bond lengths are 3.00 Å. Both Ho(4)-Fe(5) bond lengths are 2.98 Å. Both Ho(4)-Fe(6) bond lengths are 2.99 Å. All Ho(4)-Fe(11) bond lengths are 3.12 Å. All Ho(4)-Fe(9) bond lengths are 3.31 Å. There are fourteen inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a single-bond geometry to one Fe(3), two equivalent Fe(12), two equivalent Fe(13), two equivalent Fe(8), and one C(1) atom. The Fe(1)-Fe(3) bond length is 2.52 Å. Both Fe(1)-Fe(12) bond lengths are 2.54 Å. Both Fe(1)-Fe(13) bond lengths are 2.45 Å. Both Fe(1)-Fe(8) bond lengths are 2.71 Å. The Fe(1)-C(1) bond length is 1.83 Å. In the second Fe site, Fe(2) is bonded in a single-bond geometry to one Fe(3), two equivalent Fe(11), two equivalent Fe(14), two equivalent Fe(8), and one C(1) atom. The Fe(2)-Fe(3) bond length is 2.41 Å. Both Fe(2)-Fe(11) bond lengths are 2.54 Å. Both Fe(2)-Fe(14) bond lengths are 2.46 Å. Both Fe(2)-Fe(8) bond lengths are 2.71 Å. The Fe(2)-C(1) bond length is 1.84 Å. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to one Ho(1), one Ho(3), one Fe(1), one Fe(2), two equivalent Fe(10), two equivalent Fe(11), two equivalent Fe(13), and two equivalent Fe(8) atoms. Both Fe(3)-Fe(10) bond lengths are 2.60 Å. Both Fe(3)-Fe(11) bond lengths are 2.54 Å. Both Fe(3)-Fe(13) bond lengths are 2.46 Å. Both Fe(3)-Fe(8) bond lengths are 2.77 Å. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Ho(2), one Ho(4), one Fe(4), one Fe(6), two equivalent Fe(10), two equivalent Fe(11), two equivalent Fe(13), and two equivalent Fe(7) atoms. The Fe(4)-Fe(4) bond length is 2.45 Å. The Fe(4)-Fe(6) bond length is 2.58 Å. Both Fe(4)-Fe(10) bond lengths are 2.54 Å. Both Fe(4)-Fe(11) bond lengths are 2.58 Å. Both Fe(4)-Fe(13) bond lengths are 2.44 Å. Both Fe(4)-Fe(7) bond lengths are 2.78 Å. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to one Ho(2), one Ho(4), one Fe(5), one Fe(6), two equivalent Fe(11), two equivalent Fe(14), two equivalent Fe(7), and two equivalent Fe(9) atoms. The Fe(5)-Fe(5) bond length is 2.58 Å. The Fe(5)-Fe(6) bond length is 2.45 Å. Both Fe(5)-Fe(11) bond lengths are 2.59 Å. Both Fe(5)-Fe(14) bond lengths are 2.43 Å. Both Fe(5)-Fe(7) bond lengths are 2.79 Å. Both Fe(5)-Fe(9) bond lengths are 2.55 Å. In the sixth Fe site, Fe(6) is bonded in a 12-coordinate geometry to one Ho(2), one Ho(4), one Fe(4), one Fe(5), two equivalent Fe(12), two equivalent Fe(13), two equivalent Fe(7), and two equivalent Fe(9) atoms. Both Fe(6)-Fe(12) bond lengths are 2.59 Å. Both Fe(6)-Fe(13) bond lengths are 2.44 Å. Both Fe(6)-Fe(7) bond lengths are 2.77 Å. Both Fe(6)-Fe(9) bond lengths are 2.55 Å. In the seventh Fe site, Fe(7) is bonded in a 14-coordinate geometry to one Ho(1), one Fe(10), one Fe(14), one Fe(7), two equivalent Fe(13), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), and two equivalent Fe(9) atoms. The Fe(7)-Fe(10) bond length is 2.68 Å. The Fe(7)-Fe(14) bond length is 2.64 Å. The Fe(7)-Fe(7) bond length is 2.36 Å. Both Fe(7)-Fe(13) bond lengths are 2.62 Å. Both Fe(7)-Fe(9) bond lengths are 2.67 Å. In the eighth Fe site, Fe(8) is bonded in a 14-coordinate geometry to one Ho(2), one Fe(12), one Fe(14), one Fe(8), two equivalent Fe(1), two equivalent Fe(11), two equivalent Fe(13), two equivalent Fe(2), and two equivalent Fe(3) atoms. The Fe(8)-Fe(12) bond length is 2.66 Å. The Fe(8)-Fe(14) bond length is 2.61 Å. The Fe(8)-Fe(8) bond length is 2.39 Å. Both Fe(8)-Fe(11) bond lengths are 2.66 Å. Both Fe(8)-Fe(13) bond lengths are 2.60 Å. In the ninth Fe site, Fe(9) is bonded in a single-bond geometry to one Ho(4), one Fe(11), one Fe(12), one Fe(13), one Fe(14), one Fe(5), one Fe(6), one Fe(7), and one C(1) atom. The Fe(9)-Fe(11) bond length is 2.50 Å. The Fe(9)-Fe(12) bond length is 2.49 Å. The Fe(9)-Fe(13) bond length is 2.48 Å. The Fe(9)-Fe(14) bond length is 2.48 Å. The Fe(9)-C(1) bond length is 1.91 Å. In the tenth Fe site, Fe(10) is bonded to one Ho(1), one Ho(3), one Ho(4), one Fe(7), two equivalent Fe(11), two equivalent Fe(13), two equivalent Fe(3), and two equivalent Fe(4) atoms to form distorted FeHo3Fe9 cuboctahedra that share corners with two equivalent Fe(13)Ho2Fe10 cuboctahedra, corners with three equivalent Fe(14)Ho2Fe10 cuboctahedra, corners with four equivalent Fe(12)Ho3Fe9 cuboctahedra, corners with four equivalent C(1)Ho2Fe4 octahedra,  an edgeedge with one Fe(14)Ho2Fe10 cuboctahedra,  an edgeedge with one Fe(12)Ho3Fe9 cuboctahedra, edges with two equivalent Fe(13)Ho2Fe10 cuboctahedra, edges with four equivalent Fe(11)Ho3Fe9 cuboctahedra, faces with two equivalent Fe(13)Ho2Fe10 cuboctahedra, faces with two equivalent Fe(10)Ho3Fe9 cuboctahedra, and faces with two equivalent Fe(11)Ho3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles are 66°. Both Fe(10)-Fe(11) bond lengths are 2.47 Å. Both Fe(10)-Fe(13) bond lengths are 2.47 Å. In the eleventh Fe site, Fe(11) is bonded to one Ho(2), one Ho(3), one Ho(4), one Fe(10), one Fe(13), one Fe(14), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(8), and one Fe(9) atom to form distorted FeHo3Fe9 cuboctahedra that share  a cornercorner with one Fe(14)Ho2Fe10 cuboctahedra, corners with three equivalent Fe(11)Ho3Fe9 cuboctahedra, corners with three equivalent Fe(12)Ho3Fe9 cuboctahedra, corners with four equivalent Fe(13)Ho2Fe10 cuboctahedra,  a cornercorner with one C(1)Ho2Fe4 octahedra,  an edgeedge with one Fe(14)Ho2Fe10 cuboctahedra, edges with two equivalent Fe(13)Ho2Fe10 cuboctahedra, edges with two equivalent Fe(10)Ho3Fe9 cuboctahedra,  a faceface with one Fe(13)Ho2Fe10 cuboctahedra,  a faceface with one Fe(14)Ho2Fe10 cuboctahedra,  a faceface with one Fe(10)Ho3Fe9 cuboctahedra, faces with two equivalent Fe(12)Ho3Fe9 cuboctahedra, faces with four equivalent Fe(11)Ho3Fe9 cuboctahedra, and  a faceface with one C(1)Ho2Fe4 octahedra. The corner-sharing octahedral tilt angles are 42°. The Fe(11)-Fe(13) bond length is 2.45 Å. The Fe(11)-Fe(14) bond length is 2.45 Å. In the twelfth Fe site, Fe(12) is bonded to one Ho(2), one Ho(3), one Ho(4), one Fe(8), two equivalent Fe(1), two equivalent Fe(13), two equivalent Fe(6), and two equivalent Fe(9) atoms to form distorted FeHo3Fe9 cuboctahedra that share corners with two equivalent Fe(13)Ho2Fe10 cuboctahedra, corners with three equivalent Fe(14)Ho2Fe10 cuboctahedra, corners with four equivalent Fe(10)Ho3Fe9 cuboctahedra, corners with six equivalent Fe(11)Ho3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Ho2Fe10 cuboctahedra,  an edgeedge with one Fe(10)Ho3Fe9 cuboctahedra, edges with two equivalent Fe(13)Ho2Fe10 cuboctahedra, faces with two equivalent Fe(13)Ho2Fe10 cuboctahedra, faces with two equivalent Fe(12)Ho3Fe9 cuboctahedra, faces with four equivalent Fe(11)Ho3Fe9 cuboctahedra, and faces with two equivalent C(1)Ho2Fe4 octahedra. Both Fe(12)-Fe(13) bond lengths are 2.45 Å. In the thirteenth Fe site, Fe(13) is bonded to one Ho(1), one Ho(2), one Fe(1), one Fe(10), one Fe(11), one Fe(12), one Fe(3), one Fe(4), one Fe(6), one Fe(7), one Fe(8), and one Fe(9) atom to form FeHo2Fe10 cuboctahedra that share  a cornercorner with one Fe(10)Ho3Fe9 cuboctahedra,  a cornercorner with one Fe(12)Ho3Fe9 cuboctahedra, corners with two equivalent Fe(13)Ho2Fe10 cuboctahedra, corners with two equivalent Fe(14)Ho2Fe10 cuboctahedra, corners with four equivalent Fe(11)Ho3Fe9 cuboctahedra,  a cornercorner with one C(1)Ho2Fe4 octahedra,  an edgeedge with one Fe(10)Ho3Fe9 cuboctahedra,  an edgeedge with one Fe(12)Ho3Fe9 cuboctahedra, edges with two equivalent Fe(11)Ho3Fe9 cuboctahedra,  a faceface with one Fe(10)Ho3Fe9 cuboctahedra,  a faceface with one Fe(11)Ho3Fe9 cuboctahedra,  a faceface with one Fe(12)Ho3Fe9 cuboctahedra, faces with two equivalent Fe(14)Ho2Fe10 cuboctahedra, faces with four equivalent Fe(13)Ho2Fe10 cuboctahedra, and  a faceface with one C(1)Ho2Fe4 octahedra. The corner-sharing octahedral tilt angles are 40°. In the fourteenth Fe site, Fe(14) is bonded to one Ho(1), one Ho(2), one Fe(7), one Fe(8), two equivalent Fe(11), two equivalent Fe(2), two equivalent Fe(5), and two equivalent Fe(9) atoms to form FeHo2Fe10 cuboctahedra that share corners with two equivalent Fe(11)Ho3Fe9 cuboctahedra, corners with three equivalent Fe(10)Ho3Fe9 cuboctahedra, corners with three equivalent Fe(12)Ho3Fe9 cuboctahedra, corners with four equivalent Fe(13)Ho2Fe10 cuboctahedra,  an edgeedge with one Fe(10)Ho3Fe9 cuboctahedra,  an edgeedge with one Fe(12)Ho3Fe9 cuboctahedra, edges with two equivalent Fe(11)Ho3Fe9 cuboctahedra, faces with two equivalent Fe(14)Ho2Fe10 cuboctahedra, faces with two equivalent Fe(11)Ho3Fe9 cuboctahedra, faces with four equivalent Fe(13)Ho2Fe10 cuboctahedra, and faces with two equivalent C(1)Ho2Fe4 octahedra. C(1) is bonded to one Ho(1), one Ho(3), one Fe(1), one Fe(2), and two equivalent Fe(9) atoms to form CHo2Fe4 octahedra that share corners with two equivalent Fe(13)Ho2Fe10 cuboctahedra, corners with two equivalent Fe(11)Ho3Fe9 cuboctahedra, corners with four equivalent Fe(10)Ho3Fe9 cuboctahedra, corners with two equivalent C(1)Ho2Fe4 octahedra, faces with two equivalent Fe(13)Ho2Fe10 cuboctahedra, faces with two equivalent Fe(14)Ho2Fe10 cuboctahedra, faces with two equivalent Fe(11)Ho3Fe9 cuboctahedra, and faces with two equivalent Fe(12)Ho3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles range from 61-62°.