HoNiGa4 crystallizes in the orthorhombic Cmcm space group. Ho(1) is bonded in a 15-coordinate geometry to two equivalent Ni(1), three equivalent Ga(2), four equivalent Ga(3), and six equivalent Ga(1) atoms. Ni(1) is bonded in a 9-coordinate geometry to two equivalent Ho(1), one Ga(2), and six equivalent Ga(1) atoms. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 12-coordinate geometry to three equivalent Ho(1), three equivalent Ni(1), one Ga(3), two equivalent Ga(2), and three equivalent Ga(1) atoms. In the second Ga site, Ga(2) is bonded in a distorted linear geometry to three equivalent Ho(1), one Ni(1), four equivalent Ga(1), and four equivalent Ga(3) atoms. In the third Ga site, Ga(3) is bonded in a distorted q6 geometry to four equivalent Ho(1), two equivalent Ga(1), and four equivalent Ga(2) atoms.
HoNiGa4 crystallizes in the orthorhombic Cmcm space group. Ho(1) is bonded in a 15-coordinate geometry to two equivalent Ni(1), three equivalent Ga(2), four equivalent Ga(3), and six equivalent Ga(1) atoms. Both Ho(1)-Ni(1) bond lengths are 3.11 Å. There is one shorter (2.87 Å) and two longer (3.33 Å) Ho(1)-Ga(2) bond lengths. All Ho(1)-Ga(3) bond lengths are 3.17 Å. There are four shorter (3.00 Å) and two longer (3.21 Å) Ho(1)-Ga(1) bond lengths. Ni(1) is bonded in a 9-coordinate geometry to two equivalent Ho(1), one Ga(2), and six equivalent Ga(1) atoms. The Ni(1)-Ga(2) bond length is 2.32 Å. There are two shorter (2.39 Å) and four longer (2.47 Å) Ni(1)-Ga(1) bond lengths. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 12-coordinate geometry to three equivalent Ho(1), three equivalent Ni(1), one Ga(3), two equivalent Ga(2), and three equivalent Ga(1) atoms. The Ga(1)-Ga(3) bond length is 2.82 Å. Both Ga(1)-Ga(2) bond lengths are 2.97 Å. There is one shorter (2.58 Å) and two longer (2.89 Å) Ga(1)-Ga(1) bond lengths. In the second Ga site, Ga(2) is bonded in a distorted linear geometry to three equivalent Ho(1), one Ni(1), four equivalent Ga(1), and four equivalent Ga(3) atoms. All Ga(2)-Ga(3) bond lengths are 2.81 Å. In the third Ga site, Ga(3) is bonded in a distorted q6 geometry to four equivalent Ho(1), two equivalent Ga(1), and four equivalent Ga(2) atoms.