HoNiSi2 crystallizes in the orthorhombic Cmcm space group. Ho(1) is bonded in a 14-coordinate geometry to four equivalent Ni(1), four equivalent Si(1), and six equivalent Si(2) atoms. Ni(1) is bonded in a 9-coordinate geometry to four equivalent Ho(1), one Si(2), and four equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to four equivalent Ho(1) and four equivalent Ni(1) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ho(1), one Ni(1), and two equivalent Si(2) atoms.
HoNiSi2 crystallizes in the orthorhombic Cmcm space group. Ho(1) is bonded in a 14-coordinate geometry to four equivalent Ni(1), four equivalent Si(1), and six equivalent Si(2) atoms. All Ho(1)-Ni(1) bond lengths are 3.02 Å. There are two shorter (3.06 Å) and two longer (3.08 Å) Ho(1)-Si(1) bond lengths. There are four shorter (2.99 Å) and two longer (3.11 Å) Ho(1)-Si(2) bond lengths. Ni(1) is bonded in a 9-coordinate geometry to four equivalent Ho(1), one Si(2), and four equivalent Si(1) atoms. The Ni(1)-Si(2) bond length is 2.24 Å. There are two shorter (2.30 Å) and two longer (2.31 Å) Ni(1)-Si(1) bond lengths. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to four equivalent Ho(1) and four equivalent Ni(1) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ho(1), one Ni(1), and two equivalent Si(2) atoms. Both Si(2)-Si(2) bond lengths are 2.37 Å.