The crystal structure described by K2Mn(SnSe3)2 crystallizes in the tetragonal P4/ncc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to four equivalent Se(1) and four equivalent Se(2) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to eight equivalent Se(2) atoms. Mn(1) is bonded to four equivalent Se(2) atoms to form MnSe4 tetrahedra that share edges with two equivalent Sn(1)Se4 tetrahedra. Sn(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form distorted SnSe4 tetrahedra that share  an edgeedge with one Mn(1)Se4 tetrahedra and  an edgeedge with one Sn(1)Se4 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent K(1) and two equivalent Sn(1) atoms to form a mixture of distorted corner and edge-sharing SeK2Sn2 trigonal pyramids. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to one K(1), two equivalent K(2), one Mn(1), and one Sn(1) atom. is represented by the CIF card [CIF]
data_K2Mn(SnSe3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.429
_cell_length_b   8.429
_cell_length_c   19.944
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1416.878
_cell_formula_units_Z   4
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
  K  K0  1  0.000  0.500  0.321  1.0
  K  K1  1  0.000  0.500  0.026  1.0
  K  K2  1  0.500  0.000  0.179  1.0
  K  K3  1  0.000  0.500  0.821  1.0
  K  K4  1  0.500  0.000  0.679  1.0
  K  K5  1  0.500  0.000  0.974  1.0
  K  K6  1  0.500  0.000  0.474  1.0
  K  K7  1  0.000  0.500  0.526  1.0
  Mn  Mn8  1  0.000  0.000  0.000  1.0
  Mn  Mn9  1  0.500  0.500  0.500  1.0
  Mn  Mn10  1  0.000  0.000  0.500  1.0
  Mn  Mn11  1  0.500  0.500  0.000  1.0
  Sn  Sn12  1  0.000  0.000  0.338  1.0
  Sn  Sn13  1  0.000  0.000  0.162  1.0
  Sn  Sn14  1  0.500  0.500  0.838  1.0
  Sn  Sn15  1  0.500  0.500  0.662  1.0
  Sn  Sn16  1  0.500  0.500  0.338  1.0
  Sn  Sn17  1  0.500  0.500  0.162  1.0
  Sn  Sn18  1  0.000  0.000  0.838  1.0
  Sn  Sn19  1  0.000  0.000  0.662  1.0
  Se  Se20  1  0.663  0.337  0.250  1.0
  Se  Se21  1  0.678  0.345  0.918  1.0
  Se  Se22  1  0.322  0.345  0.418  1.0
  Se  Se23  1  0.845  0.822  0.918  1.0
  Se  Se24  1  0.337  0.663  0.250  1.0
  Se  Se25  1  0.845  0.178  0.418  1.0
  Se  Se26  1  0.655  0.322  0.582  1.0
  Se  Se27  1  0.337  0.337  0.750  1.0
  Se  Se28  1  0.345  0.322  0.082  1.0
  Se  Se29  1  0.837  0.163  0.750  1.0
  Se  Se30  1  0.655  0.678  0.082  1.0
  Se  Se31  1  0.663  0.663  0.750  1.0
  Se  Se32  1  0.822  0.155  0.082  1.0
  Se  Se33  1  0.678  0.655  0.418  1.0
  Se  Se34  1  0.163  0.837  0.750  1.0
  Se  Se35  1  0.837  0.837  0.250  1.0
  Se  Se36  1  0.345  0.678  0.582  1.0
  Se  Se37  1  0.178  0.845  0.082  1.0
  Se  Se38  1  0.322  0.655  0.918  1.0
  Se  Se39  1  0.163  0.163  0.250  1.0
  Se  Se40  1  0.178  0.155  0.582  1.0
  Se  Se41  1  0.155  0.822  0.418  1.0
  Se  Se42  1  0.822  0.845  0.582  1.0
  Se  Se43  1  0.155  0.178  0.918  1.0
[/CIF]
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The crystal structure described by K2Mn(SnSe3)2 crystallizes in the tetragonal P4/ncc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to four equivalent Se(1) and four equivalent Se(2) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to eight equivalent Se(2) atoms. Mn(1) is bonded to four equivalent Se(2) atoms to form MnSe4 tetrahedra that share edges with two equivalent Sn(1)Se4 tetrahedra. Sn(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form distorted SnSe4 tetrahedra that share  an edgeedge with one Mn(1)Se4 tetrahedra and  an edgeedge with one Sn(1)Se4 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent K(1) and two equivalent Sn(1) atoms to form a mixture of distorted corner and edge-sharing SeK2Sn2 trigonal pyramids. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to one K(1), two equivalent K(2), one Mn(1), and one Sn(1) atom. is represented by the CIF card [CIF]
data_K2Mn(SnSe3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.429
_cell_length_b   8.429
_cell_length_c   19.944
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1416.878
_cell_formula_units_Z   4
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
  K  K0  1  0.000  0.500  0.321  1.0
  K  K1  1  0.000  0.500  0.026  1.0
  K  K2  1  0.500  0.000  0.179  1.0
  K  K3  1  0.000  0.500  0.821  1.0
  K  K4  1  0.500  0.000  0.679  1.0
  K  K5  1  0.500  0.000  0.974  1.0
  K  K6  1  0.500  0.000  0.474  1.0
  K  K7  1  0.000  0.500  0.526  1.0
  Mn  Mn8  1  0.000  0.000  0.000  1.0
  Mn  Mn9  1  0.500  0.500  0.500  1.0
  Mn  Mn10  1  0.000  0.000  0.500  1.0
  Mn  Mn11  1  0.500  0.500  0.000  1.0
  Sn  Sn12  1  0.000  0.000  0.338  1.0
  Sn  Sn13  1  0.000  0.000  0.162  1.0
  Sn  Sn14  1  0.500  0.500  0.838  1.0
  Sn  Sn15  1  0.500  0.500  0.662  1.0
  Sn  Sn16  1  0.500  0.500  0.338  1.0
  Sn  Sn17  1  0.500  0.500  0.162  1.0
  Sn  Sn18  1  0.000  0.000  0.838  1.0
  Sn  Sn19  1  0.000  0.000  0.662  1.0
  Se  Se20  1  0.663  0.337  0.250  1.0
  Se  Se21  1  0.678  0.345  0.918  1.0
  Se  Se22  1  0.322  0.345  0.418  1.0
  Se  Se23  1  0.845  0.822  0.918  1.0
  Se  Se24  1  0.337  0.663  0.250  1.0
  Se  Se25  1  0.845  0.178  0.418  1.0
  Se  Se26  1  0.655  0.322  0.582  1.0
  Se  Se27  1  0.337  0.337  0.750  1.0
  Se  Se28  1  0.345  0.322  0.082  1.0
  Se  Se29  1  0.837  0.163  0.750  1.0
  Se  Se30  1  0.655  0.678  0.082  1.0
  Se  Se31  1  0.663  0.663  0.750  1.0
  Se  Se32  1  0.822  0.155  0.082  1.0
  Se  Se33  1  0.678  0.655  0.418  1.0
  Se  Se34  1  0.163  0.837  0.750  1.0
  Se  Se35  1  0.837  0.837  0.250  1.0
  Se  Se36  1  0.345  0.678  0.582  1.0
  Se  Se37  1  0.178  0.845  0.082  1.0
  Se  Se38  1  0.322  0.655  0.918  1.0
  Se  Se39  1  0.163  0.163  0.250  1.0
  Se  Se40  1  0.178  0.155  0.582  1.0
  Se  Se41  1  0.155  0.822  0.418  1.0
  Se  Se42  1  0.822  0.845  0.582  1.0
  Se  Se43  1  0.155  0.178  0.918  1.0
[/CIF]
.