NpAsS is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. Np(1) is bonded in a 9-coordinate geometry to four equivalent As(1) and five equivalent S(1) atoms. As(1) is bonded to four equivalent Np(1) and four equivalent As(1) atoms to form distorted AsNp4As4 hexagonal bipyramids that share corners with four equivalent As(1)Np4As4 hexagonal bipyramids, corners with twelve equivalent S(1)Np5 trigonal bipyramids, edges with four equivalent As(1)Np4As4 hexagonal bipyramids, edges with four equivalent S(1)Np5 trigonal bipyramids, and faces with four equivalent As(1)Np4As4 hexagonal bipyramids. S(1) is bonded to five equivalent Np(1) atoms to form distorted SNp5 trigonal bipyramids that share corners with twelve equivalent As(1)Np4As4 hexagonal bipyramids, corners with four equivalent S(1)Np5 trigonal bipyramids, edges with four equivalent As(1)Np4As4 hexagonal bipyramids, and edges with eight equivalent S(1)Np5 trigonal bipyramids.
NpAsS is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. Np(1) is bonded in a 9-coordinate geometry to four equivalent As(1) and five equivalent S(1) atoms. All Np(1)-As(1) bond lengths are 3.11 Å. There are four shorter (2.84 Å) and one longer (2.93 Å) Np(1)-S(1) bond length. As(1) is bonded to four equivalent Np(1) and four equivalent As(1) atoms to form distorted AsNp4As4 hexagonal bipyramids that share corners with four equivalent As(1)Np4As4 hexagonal bipyramids, corners with twelve equivalent S(1)Np5 trigonal bipyramids, edges with four equivalent As(1)Np4As4 hexagonal bipyramids, edges with four equivalent S(1)Np5 trigonal bipyramids, and faces with four equivalent As(1)Np4As4 hexagonal bipyramids. All As(1)-As(1) bond lengths are 2.75 Å. S(1) is bonded to five equivalent Np(1) atoms to form distorted SNp5 trigonal bipyramids that share corners with twelve equivalent As(1)Np4As4 hexagonal bipyramids, corners with four equivalent S(1)Np5 trigonal bipyramids, edges with four equivalent As(1)Np4As4 hexagonal bipyramids, and edges with eight equivalent S(1)Np5 trigonal bipyramids.