CsNaSe is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. Cs(1) is bonded in a 5-coordinate geometry to five equivalent Se(1) atoms. Na(1) is bonded to four equivalent Se(1) atoms to form a mixture of edge and corner-sharing NaSe4 tetrahedra. Se(1) is bonded in a 9-coordinate geometry to five equivalent Cs(1) and four equivalent Na(1) atoms.
CsNaSe is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. Cs(1) is bonded in a 5-coordinate geometry to five equivalent Se(1) atoms. There is one shorter (3.71 Å) and four longer (3.75 Å) Cs(1)-Se(1) bond lengths. Na(1) is bonded to four equivalent Se(1) atoms to form a mixture of edge and corner-sharing NaSe4 tetrahedra. All Na(1)-Se(1) bond lengths are 2.95 Å. Se(1) is bonded in a 9-coordinate geometry to five equivalent Cs(1) and four equivalent Na(1) atoms.