data_Pm3Np
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.07
_cell_length_b   5.07
_cell_length_c   5.07
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Pm3Np
_chemical_formula_sum   'Pm3 Np1'
_cell_volume   130.49
_cell_formula_units_Z   1
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
  Pm  Pm1  1  0.54  0.54  0.0  1.0
  Pm  Pm2  1  0.54  0.0  0.54  1.0
  Pm  Pm3  1  0.0  0.54  0.54  1.0
  Np  Np0  1  0.0  0.0  0.0  1.0

data_Pm3Np
_symmetry_space_group_name_H-M   R3m
_cell_length_a   7.17
_cell_length_b   7.17
_cell_length_c   8.79
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Pm3Np
_chemical_formula_sum   'Pm9 Np3'
_cell_volume   391.46
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  Pm  Pm0  9  0.18  0.36  0.36  1.0
  Np  Np1  3  0.0  0.0  0.0  1.0

Pm Pm Pm Np
Pm Pm Pm Np 0 3 o o o 0 3 o + o 0 3 + o o 0 3 + + o 0 2 o o - 0 2 o o o 0 2 + o - 0 2 + o o 0 1 o o - 0 1 o o o 0 1 o + - 0 1 o + o 1 2 o - o 1 2 o o o 1 2 + - o 1 2 + o o 1 3 o o o 1 3 o o + 1 3 + o o 1 3 + o + 2 3 o o o 2 3 o o + 2 3 o + o 2 3 o + + 
NpPm3 is Uranium Silicide structured and crystallizes in the trigonal R3m space group. Np(1) is bonded to twelve equivalent Pm(1) atoms to form NpPm12 cuboctahedra that share corners with twelve equivalent Np(1)Pm12 cuboctahedra, edges with twenty-four equivalent Pm(1)Pm8Np4 cuboctahedra, faces with six equivalent Np(1)Pm12 cuboctahedra, and faces with twelve equivalent Pm(1)Pm8Np4 cuboctahedra. There are a spread of Np(1)-Pm(1) bond distances ranging from 3.33-3.85 Å. Pm(1) is bonded to four equivalent Np(1) and eight equivalent Pm(1) atoms to form distorted PmPm8Np4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Np4 cuboctahedra, edges with eight equivalent Np(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Np4 cuboctahedra, faces with four equivalent Np(1)Pm12 cuboctahedra, and faces with fourteen equivalent Pm(1)Pm8Np4 cuboctahedra. There are a spread of Pm(1)-Pm(1) bond distances ranging from 3.33-3.85 Å.