MgHoSe3 is Ilmenite structured and crystallizes in the trigonal R-3 space group. Mg(1) is bonded to six equivalent Se(1) atoms to form MgSe6 octahedra that share corners with nine equivalent Ho(1)Se6 octahedra, edges with three equivalent Mg(1)Se6 octahedra, and  a faceface with one Ho(1)Se6 octahedra. The corner-sharing octahedral tilt angles range from 43-55°. Ho(1) is bonded to six equivalent Se(1) atoms to form HoSe6 octahedra that share corners with nine equivalent Mg(1)Se6 octahedra, edges with three equivalent Ho(1)Se6 octahedra, and  a faceface with one Mg(1)Se6 octahedra. The corner-sharing octahedral tilt angles range from 43-55°. Se(1) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent Ho(1) atoms.
MgHoSe3 is Ilmenite structured and crystallizes in the trigonal R-3 space group. Mg(1) is bonded to six equivalent Se(1) atoms to form MgSe6 octahedra that share corners with nine equivalent Ho(1)Se6 octahedra, edges with three equivalent Mg(1)Se6 octahedra, and  a faceface with one Ho(1)Se6 octahedra. The corner-sharing octahedral tilt angles range from 43-55°. There are three shorter (2.71 Å) and three longer (2.77 Å) Mg(1)-Se(1) bond lengths. Ho(1) is bonded to six equivalent Se(1) atoms to form HoSe6 octahedra that share corners with nine equivalent Mg(1)Se6 octahedra, edges with three equivalent Ho(1)Se6 octahedra, and  a faceface with one Mg(1)Se6 octahedra. The corner-sharing octahedral tilt angles range from 43-55°. There are three shorter (2.82 Å) and three longer (2.85 Å) Ho(1)-Se(1) bond lengths. Se(1) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent Ho(1) atoms.