The material described by Sm10Sb3Se7 is Caswellsilverite-like structured and crystallizes in the monoclinic C2/m space group. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one Sb(1), one Se(3), two equivalent Se(1), and two equivalent Se(2) atoms to form SmSbSe5 octahedra that share corners with two equivalent Sm(1)SbSe5 octahedra, corners with four equivalent Sm(3)Sb2Se4 octahedra, edges with two equivalent Sm(3)Sb2Se4 octahedra, edges with two equivalent Sm(1)SbSe5 octahedra, and edges with eight equivalent Sm(2)Sb2Se4 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the second Sm site, Sm(2) is bonded to one Sb(1), one Sb(2), one Se(1), one Se(2), one Se(3), and one Se(4) atom to form SmSb2Se4 octahedra that share corners with two equivalent Sm(3)Sb2Se4 octahedra, corners with four equivalent Sm(2)Sb2Se4 octahedra, edges with three equivalent Sm(2)Sb2Se4 octahedra, edges with four equivalent Sm(1)SbSe5 octahedra, and edges with five equivalent Sm(3)Sb2Se4 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the third Sm site, Sm(3) is bonded to two equivalent Sb(2), one Se(1), one Se(2), and two equivalent Se(4) atoms to form SmSb2Se4 octahedra that share corners with two equivalent Sm(2)Sb2Se4 octahedra, corners with two equivalent Sm(3)Sb2Se4 octahedra, corners with two equivalent Sm(1)SbSe5 octahedra,  an edgeedge with one Sm(1)SbSe5 octahedra, edges with five equivalent Sm(2)Sb2Se4 octahedra, and edges with six equivalent Sm(3)Sb2Se4 octahedra. The corner-sharing octahedral tilt angles range from 2-5°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent Sm(1) and four equivalent Sm(2) atoms to form SbSm6 octahedra that share corners with two equivalent Se(3)Sm6 octahedra, corners with four equivalent Sb(2)Sm6 octahedra, edges with two equivalent Se(3)Sm6 octahedra, edges with two equivalent Se(4)Sm6 octahedra, edges with four equivalent Se(1)Sm6 octahedra, and edges with four equivalent Se(2)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second Sb site, Sb(2) is bonded to two equivalent Sm(2) and four equivalent Sm(3) atoms to form SbSm6 octahedra that share corners with two equivalent Sb(1)Sm6 octahedra, corners with two equivalent Se(1)Sm6 octahedra, corners with two equivalent Se(4)Sm6 octahedra,  an edgeedge with one Se(3)Sm6 octahedra, edges with two equivalent Sb(2)Sm6 octahedra, edges with two equivalent Se(1)Sm6 octahedra, edges with three equivalent Se(2)Sm6 octahedra, and edges with four equivalent Se(4)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 1-5°. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Sm(1), two equivalent Sm(2), and two equivalent Sm(3) atoms to form SeSm6 octahedra that share corners with two equivalent Sb(2)Sm6 octahedra, corners with four equivalent Se(2)Sm6 octahedra,  an edgeedge with one Se(1)Sm6 octahedra, edges with two equivalent Sb(1)Sm6 octahedra, edges with two equivalent Sb(2)Sm6 octahedra, edges with two equivalent Se(2)Sm6 octahedra, edges with two equivalent Se(3)Sm6 octahedra, and edges with three equivalent Se(4)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 2-3°. In the second Se site, Se(2) is bonded to two equivalent Sm(1), two equivalent Sm(2), and two equivalent Sm(3) atoms to form SeSm6 octahedra that share corners with two equivalent Se(4)Sm6 octahedra, corners with four equivalent Se(1)Sm6 octahedra,  an edgeedge with one Se(2)Sm6 octahedra, edges with two equivalent Sb(1)Sm6 octahedra, edges with two equivalent Se(1)Sm6 octahedra, edges with two equivalent Se(3)Sm6 octahedra, edges with two equivalent Se(4)Sm6 octahedra, and edges with three equivalent Sb(2)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 2-4°. In the third Se site, Se(3) is bonded to two equivalent Sm(1) and four equivalent Sm(2) atoms to form SeSm6 octahedra that share corners with two equivalent Sb(1)Sm6 octahedra, corners with four equivalent Se(4)Sm6 octahedra, edges with two equivalent Sb(1)Sm6 octahedra, edges with two equivalent Sb(2)Sm6 octahedra, edges with four equivalent Se(1)Sm6 octahedra, and edges with four equivalent Se(2)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the fourth Se site, Se(4) is bonded to two equivalent Sm(2) and four equivalent Sm(3) atoms to form SeSm6 octahedra that share corners with two equivalent Sb(2)Sm6 octahedra, corners with two equivalent Se(2)Sm6 octahedra, corners with two equivalent Se(3)Sm6 octahedra,  an edgeedge with one Sb(1)Sm6 octahedra, edges with two equivalent Se(2)Sm6 octahedra, edges with two equivalent Se(4)Sm6 octahedra, edges with three equivalent Se(1)Sm6 octahedra, and edges with four equivalent Sb(2)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 1-5°. is represented by the CIF file [CIF]
data_Sm10Sb3Se7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.263
_cell_length_b   11.263
_cell_length_c   7.373
_cell_angle_alpha   83.762
_cell_angle_beta   83.762
_cell_angle_gamma   141.651
_symmetry_Int_Tables_number   1
_cell_volume   547.647
_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
  Sm  Sm0  1  0.247  0.247  0.744  1.0
  Sm  Sm1  1  0.853  0.652  0.748  1.0
  Sm  Sm2  1  0.753  0.753  0.256  1.0
  Sm  Sm3  1  0.444  0.050  0.762  1.0
  Sm  Sm4  1  0.348  0.147  0.252  1.0
  Sm  Sm5  1  0.050  0.444  0.762  1.0
  Sm  Sm6  1  0.950  0.556  0.238  1.0
  Sm  Sm7  1  0.652  0.853  0.748  1.0
  Sm  Sm8  1  0.556  0.950  0.238  1.0
  Sm  Sm9  1  0.147  0.348  0.252  1.0
  Sb  Sb10  1  0.500  0.500  0.000  1.0
  Sb  Sb11  1  0.203  0.797  0.500  1.0
  Sb  Sb12  1  0.797  0.203  0.500  1.0
  Se  Se13  1  0.903  0.097  0.000  1.0
  Se  Se14  1  0.401  0.599  0.500  1.0
  Se  Se15  1  0.000  0.000  0.500  1.0
  Se  Se16  1  0.599  0.401  0.500  1.0
  Se  Se17  1  0.097  0.903  0.000  1.0
  Se  Se18  1  0.700  0.300  0.000  1.0
  Se  Se19  1  0.300  0.700  0.000  1.0
[/CIF]
.
The material described by Sm10Sb3Se7 is Caswellsilverite-like structured and crystallizes in the monoclinic C2/m space group. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one Sb(1), one Se(3), two equivalent Se(1), and two equivalent Se(2) atoms to form SmSbSe5 octahedra that share corners with two equivalent Sm(1)SbSe5 octahedra, corners with four equivalent Sm(3)Sb2Se4 octahedra, edges with two equivalent Sm(3)Sb2Se4 octahedra, edges with two equivalent Sm(1)SbSe5 octahedra, and edges with eight equivalent Sm(2)Sb2Se4 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the second Sm site, Sm(2) is bonded to one Sb(1), one Sb(2), one Se(1), one Se(2), one Se(3), and one Se(4) atom to form SmSb2Se4 octahedra that share corners with two equivalent Sm(3)Sb2Se4 octahedra, corners with four equivalent Sm(2)Sb2Se4 octahedra, edges with three equivalent Sm(2)Sb2Se4 octahedra, edges with four equivalent Sm(1)SbSe5 octahedra, and edges with five equivalent Sm(3)Sb2Se4 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the third Sm site, Sm(3) is bonded to two equivalent Sb(2), one Se(1), one Se(2), and two equivalent Se(4) atoms to form SmSb2Se4 octahedra that share corners with two equivalent Sm(2)Sb2Se4 octahedra, corners with two equivalent Sm(3)Sb2Se4 octahedra, corners with two equivalent Sm(1)SbSe5 octahedra,  an edgeedge with one Sm(1)SbSe5 octahedra, edges with five equivalent Sm(2)Sb2Se4 octahedra, and edges with six equivalent Sm(3)Sb2Se4 octahedra. The corner-sharing octahedral tilt angles range from 2-5°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent Sm(1) and four equivalent Sm(2) atoms to form SbSm6 octahedra that share corners with two equivalent Se(3)Sm6 octahedra, corners with four equivalent Sb(2)Sm6 octahedra, edges with two equivalent Se(3)Sm6 octahedra, edges with two equivalent Se(4)Sm6 octahedra, edges with four equivalent Se(1)Sm6 octahedra, and edges with four equivalent Se(2)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second Sb site, Sb(2) is bonded to two equivalent Sm(2) and four equivalent Sm(3) atoms to form SbSm6 octahedra that share corners with two equivalent Sb(1)Sm6 octahedra, corners with two equivalent Se(1)Sm6 octahedra, corners with two equivalent Se(4)Sm6 octahedra,  an edgeedge with one Se(3)Sm6 octahedra, edges with two equivalent Sb(2)Sm6 octahedra, edges with two equivalent Se(1)Sm6 octahedra, edges with three equivalent Se(2)Sm6 octahedra, and edges with four equivalent Se(4)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 1-5°. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Sm(1), two equivalent Sm(2), and two equivalent Sm(3) atoms to form SeSm6 octahedra that share corners with two equivalent Sb(2)Sm6 octahedra, corners with four equivalent Se(2)Sm6 octahedra,  an edgeedge with one Se(1)Sm6 octahedra, edges with two equivalent Sb(1)Sm6 octahedra, edges with two equivalent Sb(2)Sm6 octahedra, edges with two equivalent Se(2)Sm6 octahedra, edges with two equivalent Se(3)Sm6 octahedra, and edges with three equivalent Se(4)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 2-3°. In the second Se site, Se(2) is bonded to two equivalent Sm(1), two equivalent Sm(2), and two equivalent Sm(3) atoms to form SeSm6 octahedra that share corners with two equivalent Se(4)Sm6 octahedra, corners with four equivalent Se(1)Sm6 octahedra,  an edgeedge with one Se(2)Sm6 octahedra, edges with two equivalent Sb(1)Sm6 octahedra, edges with two equivalent Se(1)Sm6 octahedra, edges with two equivalent Se(3)Sm6 octahedra, edges with two equivalent Se(4)Sm6 octahedra, and edges with three equivalent Sb(2)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 2-4°. In the third Se site, Se(3) is bonded to two equivalent Sm(1) and four equivalent Sm(2) atoms to form SeSm6 octahedra that share corners with two equivalent Sb(1)Sm6 octahedra, corners with four equivalent Se(4)Sm6 octahedra, edges with two equivalent Sb(1)Sm6 octahedra, edges with two equivalent Sb(2)Sm6 octahedra, edges with four equivalent Se(1)Sm6 octahedra, and edges with four equivalent Se(2)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the fourth Se site, Se(4) is bonded to two equivalent Sm(2) and four equivalent Sm(3) atoms to form SeSm6 octahedra that share corners with two equivalent Sb(2)Sm6 octahedra, corners with two equivalent Se(2)Sm6 octahedra, corners with two equivalent Se(3)Sm6 octahedra,  an edgeedge with one Sb(1)Sm6 octahedra, edges with two equivalent Se(2)Sm6 octahedra, edges with two equivalent Se(4)Sm6 octahedra, edges with three equivalent Se(1)Sm6 octahedra, and edges with four equivalent Sb(2)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 1-5°. is represented by the CIF file [CIF]
data_Sm10Sb3Se7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.263
_cell_length_b   11.263
_cell_length_c   7.373
_cell_angle_alpha   83.762
_cell_angle_beta   83.762
_cell_angle_gamma   141.651
_symmetry_Int_Tables_number   1
_cell_volume   547.647
_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
  Sm  Sm0  1  0.247  0.247  0.744  1.0
  Sm  Sm1  1  0.853  0.652  0.748  1.0
  Sm  Sm2  1  0.753  0.753  0.256  1.0
  Sm  Sm3  1  0.444  0.050  0.762  1.0
  Sm  Sm4  1  0.348  0.147  0.252  1.0
  Sm  Sm5  1  0.050  0.444  0.762  1.0
  Sm  Sm6  1  0.950  0.556  0.238  1.0
  Sm  Sm7  1  0.652  0.853  0.748  1.0
  Sm  Sm8  1  0.556  0.950  0.238  1.0
  Sm  Sm9  1  0.147  0.348  0.252  1.0
  Sb  Sb10  1  0.500  0.500  0.000  1.0
  Sb  Sb11  1  0.203  0.797  0.500  1.0
  Sb  Sb12  1  0.797  0.203  0.500  1.0
  Se  Se13  1  0.903  0.097  0.000  1.0
  Se  Se14  1  0.401  0.599  0.500  1.0
  Se  Se15  1  0.000  0.000  0.500  1.0
  Se  Se16  1  0.599  0.401  0.500  1.0
  Se  Se17  1  0.097  0.903  0.000  1.0
  Se  Se18  1  0.700  0.300  0.000  1.0
  Se  Se19  1  0.300  0.700  0.000  1.0
[/CIF]
.