The crystal structure described by 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. is represented by the CIF card [CIF]
data_NpAsS
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.888
_cell_length_b   3.888
_cell_length_c   8.494
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   128.406
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Np  Np0  1  0.000  0.500  0.714  1.0
  Np  Np1  1  0.500  0.000  0.286  1.0
  As  As2  1  0.500  0.500  0.000  1.0
  As  As3  1  0.000  0.000  0.000  1.0
  S  S4  1  0.000  0.500  0.369  1.0
  S  S5  1  0.500  0.000  0.631  1.0
[/CIF]
.
The crystal structure described by 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. is represented by the CIF card [CIF]
data_NpAsS
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.888
_cell_length_b   3.888
_cell_length_c   8.494
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   128.406
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Np  Np0  1  0.000  0.500  0.714  1.0
  Np  Np1  1  0.500  0.000  0.286  1.0
  As  As2  1  0.500  0.500  0.000  1.0
  As  As3  1  0.000  0.000  0.000  1.0
  S  S4  1  0.000  0.500  0.369  1.0
  S  S5  1  0.500  0.000  0.631  1.0
[/CIF]
.