The material structure described by In3Se3As crystallizes in the orthorhombic Pmn2_1 space group. There are three inequivalent In sites. In the first In site, In(1) is bonded to one Se(1) and three equivalent Se(2) atoms to form InSe4 tetrahedra that share  a cornercorner with one In(2)AsSe3 tetrahedra and corners with six equivalent In(1)Se4 tetrahedra. In the second In site, In(2) is bonded to one As(1), one Se(1), and two equivalent Se(3) atoms to form InAsSe3 tetrahedra that share  a cornercorner with one In(1)Se4 tetrahedra, corners with two equivalent In(2)AsSe3 tetrahedra, and corners with five equivalent In(3)As3Se tetrahedra. In the third In site, In(3) is bonded to three equivalent As(1) and one Se(3) atom to form InAs3Se tetrahedra that share corners with five equivalent In(2)AsSe3 tetrahedra and corners with six equivalent In(3)As3Se tetrahedra. As(1) is bonded to one In(2) and three equivalent In(3) atoms to form corner-sharing AsIn4 tetrahedra. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a water-like geometry to one In(1) and one In(2) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to three equivalent In(1) atoms. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one In(3) and two equivalent In(2) atoms. is represented by the CIF file [CIF]
data_In3AsSe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.246
_cell_length_b   6.130
_cell_length_c   17.092
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   444.897
_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
  In  In0  1  0.500  0.492  0.934  1.0
  In  In1  1  0.000  0.992  0.066  1.0
  In  In2  1  0.000  0.998  0.306  1.0
  In  In3  1  0.500  0.490  0.437  1.0
  In  In4  1  0.000  0.990  0.563  1.0
  In  In5  1  0.500  0.498  0.694  1.0
  As  As6  1  0.000  0.749  0.434  1.0
  As  As7  1  0.500  0.249  0.566  1.0
  Se  Se8  1  0.500  0.244  0.813  1.0
  Se  Se9  1  0.000  0.761  0.934  1.0
  Se  Se10  1  0.500  0.261  0.066  1.0
  Se  Se11  1  0.000  0.744  0.187  1.0
  Se  Se12  1  0.500  0.266  0.304  1.0
  Se  Se13  1  0.000  0.766  0.696  1.0
[/CIF]
.
The material structure described by In3Se3As crystallizes in the orthorhombic Pmn2_1 space group. There are three inequivalent In sites. In the first In site, In(1) is bonded to one Se(1) and three equivalent Se(2) atoms to form InSe4 tetrahedra that share  a cornercorner with one In(2)AsSe3 tetrahedra and corners with six equivalent In(1)Se4 tetrahedra. In the second In site, In(2) is bonded to one As(1), one Se(1), and two equivalent Se(3) atoms to form InAsSe3 tetrahedra that share  a cornercorner with one In(1)Se4 tetrahedra, corners with two equivalent In(2)AsSe3 tetrahedra, and corners with five equivalent In(3)As3Se tetrahedra. In the third In site, In(3) is bonded to three equivalent As(1) and one Se(3) atom to form InAs3Se tetrahedra that share corners with five equivalent In(2)AsSe3 tetrahedra and corners with six equivalent In(3)As3Se tetrahedra. As(1) is bonded to one In(2) and three equivalent In(3) atoms to form corner-sharing AsIn4 tetrahedra. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a water-like geometry to one In(1) and one In(2) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to three equivalent In(1) atoms. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one In(3) and two equivalent In(2) atoms. is represented by the CIF file [CIF]
data_In3AsSe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.246
_cell_length_b   6.130
_cell_length_c   17.092
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   444.897
_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
  In  In0  1  0.500  0.492  0.934  1.0
  In  In1  1  0.000  0.992  0.066  1.0
  In  In2  1  0.000  0.998  0.306  1.0
  In  In3  1  0.500  0.490  0.437  1.0
  In  In4  1  0.000  0.990  0.563  1.0
  In  In5  1  0.500  0.498  0.694  1.0
  As  As6  1  0.000  0.749  0.434  1.0
  As  As7  1  0.500  0.249  0.566  1.0
  Se  Se8  1  0.500  0.244  0.813  1.0
  Se  Se9  1  0.000  0.761  0.934  1.0
  Se  Se10  1  0.500  0.261  0.066  1.0
  Se  Se11  1  0.000  0.744  0.187  1.0
  Se  Se12  1  0.500  0.266  0.304  1.0
  Se  Se13  1  0.000  0.766  0.696  1.0
[/CIF]
.