ThAsSe is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. Th(1) is bonded in a 9-coordinate geometry to four equivalent As(1) and five equivalent Se(1) atoms. As(1) is bonded in a 8-coordinate geometry to four equivalent Th(1) and four equivalent As(1) atoms. Se(1) is bonded to five equivalent Th(1) atoms to form a mixture of distorted corner and edge-sharing SeTh5 trigonal bipyramids.
ThAsSe is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. Th(1) is bonded in a 9-coordinate geometry to four equivalent As(1) and five equivalent Se(1) atoms. All Th(1)-As(1) bond lengths are 3.06 Å. There are four shorter (3.06 Å) and one longer (3.14 Å) Th(1)-Se(1) bond length. As(1) is bonded in a 8-coordinate geometry to four equivalent Th(1) and four equivalent As(1) atoms. All As(1)-As(1) bond lengths are 2.93 Å. Se(1) is bonded to five equivalent Th(1) atoms to form a mixture of distorted corner and edge-sharing SeTh5 trigonal bipyramids.