The structure described by K2Ag(AsSe2)3 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one Se(2), one Se(3), one Se(6), two equivalent Se(4), and two equivalent Se(5) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one As(1), one Se(2), one Se(3), one Se(4), one Se(5), one Se(6), and two equivalent Se(1) atoms. Ag(1) is bonded to one Se(4), one Se(6), and two equivalent Se(2) atoms to form distorted edge-sharing AgSe4 tetrahedra. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 3-coordinate geometry to one K(2), one Se(1), one Se(2), and one Se(3) atom. In the second As site, As(2) is bonded in a trigonal non-coplanar geometry to one Se(3), one Se(4), and one Se(5) atom. In the third As site, As(3) is bonded in a trigonal non-coplanar geometry to one Se(1), one Se(5), and one Se(6) atom. There are six inequivalent Se sites. In the first Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(2), one As(1), and one As(2) atom. In the second Se site, Se(4) is bonded in a 5-coordinate geometry to one K(2), two equivalent K(1), one Ag(1), and one As(2) atom. In the third Se site, Se(5) is bonded to one K(2), two equivalent K(1), one As(2), and one As(3) atom to form distorted SeK3As2 square pyramids that share corners with two equivalent Se(5)K3As2 square pyramids,  a cornercorner with one Se(1)K2As2 trigonal pyramid, and  an edgeedge with one Se(1)K2As2 trigonal pyramid. In the fourth Se site, Se(6) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Ag(1), and one As(3) atom. In the fifth Se site, Se(1) is bonded to two equivalent K(2), one As(1), and one As(3) atom to form SeK2As2 trigonal pyramids that share  a cornercorner with one Se(5)K3As2 square pyramid, corners with two equivalent Se(1)K2As2 trigonal pyramids, and  an edgeedge with one Se(5)K3As2 square pyramid. In the sixth Se site, Se(2) is bonded in a 5-coordinate geometry to one K(1), one K(2), two equivalent Ag(1), and one As(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Ag(AsSe2)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.786
_cell_length_b   12.933
_cell_length_c   18.245
_cell_angle_alpha   53.009
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1467.392
_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  0.890  0.590  0.757  1.0
  K  K1  1  0.390  0.410  0.743  1.0
  K  K2  1  0.110  0.410  0.243  1.0
  K  K3  1  0.610  0.590  0.257  1.0
  K  K4  1  0.371  0.786  0.386  1.0
  K  K5  1  0.871  0.214  0.114  1.0
  K  K6  1  0.629  0.214  0.614  1.0
  K  K7  1  0.129  0.786  0.886  1.0
  Ag  Ag8  1  0.993  0.528  0.572  1.0
  Ag  Ag9  1  0.493  0.472  0.928  1.0
  Ag  Ag10  1  0.007  0.472  0.428  1.0
  Ag  Ag11  1  0.507  0.528  0.072  1.0
  As  As12  1  0.089  0.220  0.655  1.0
  As  As13  1  0.589  0.780  0.845  1.0
  As  As14  1  0.911  0.780  0.345  1.0
  As  As15  1  0.411  0.220  0.155  1.0
  As  As16  1  0.944  0.171  0.865  1.0
  As  As17  1  0.444  0.829  0.635  1.0
  As  As18  1  0.056  0.829  0.135  1.0
  As  As19  1  0.556  0.171  0.365  1.0
  As  As20  1  0.327  0.117  0.006  1.0
  As  As21  1  0.827  0.883  0.494  1.0
  As  As22  1  0.673  0.883  0.994  1.0
  As  As23  1  0.173  0.117  0.506  1.0
  Se  Se24  1  0.242  0.049  0.661  1.0
  Se  Se25  1  0.742  0.951  0.839  1.0
  Se  Se26  1  0.758  0.951  0.339  1.0
  Se  Se27  1  0.258  0.049  0.161  1.0
  Se  Se28  1  0.733  0.592  0.442  1.0
  Se  Se29  1  0.233  0.408  0.058  1.0
  Se  Se30  1  0.267  0.408  0.558  1.0
  Se  Se31  1  0.767  0.592  0.942  1.0
  Se  Se32  1  0.204  0.120  0.810  1.0
  Se  Se33  1  0.704  0.880  0.690  1.0
  Se  Se34  1  0.796  0.880  0.190  1.0
  Se  Se35  1  0.296  0.120  0.310  1.0
  Se  Se36  1  0.817  0.350  0.727  1.0
  Se  Se37  1  0.317  0.650  0.773  1.0
  Se  Se38  1  0.183  0.650  0.273  1.0
  Se  Se39  1  0.683  0.350  0.227  1.0
  Se  Se40  1  0.096  0.282  0.919  1.0
  Se  Se41  1  0.596  0.718  0.581  1.0
  Se  Se42  1  0.904  0.718  0.081  1.0
  Se  Se43  1  0.404  0.282  0.419  1.0
  Se  Se44  1  0.074  0.752  0.539  1.0
  Se  Se45  1  0.574  0.248  0.961  1.0
  Se  Se46  1  0.926  0.248  0.461  1.0
  Se  Se47  1  0.426  0.752  0.039  1.0
[/CIF]
.
The structure described by K2Ag(AsSe2)3 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one Se(2), one Se(3), one Se(6), two equivalent Se(4), and two equivalent Se(5) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one As(1), one Se(2), one Se(3), one Se(4), one Se(5), one Se(6), and two equivalent Se(1) atoms. Ag(1) is bonded to one Se(4), one Se(6), and two equivalent Se(2) atoms to form distorted edge-sharing AgSe4 tetrahedra. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 3-coordinate geometry to one K(2), one Se(1), one Se(2), and one Se(3) atom. In the second As site, As(2) is bonded in a trigonal non-coplanar geometry to one Se(3), one Se(4), and one Se(5) atom. In the third As site, As(3) is bonded in a trigonal non-coplanar geometry to one Se(1), one Se(5), and one Se(6) atom. There are six inequivalent Se sites. In the first Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(2), one As(1), and one As(2) atom. In the second Se site, Se(4) is bonded in a 5-coordinate geometry to one K(2), two equivalent K(1), one Ag(1), and one As(2) atom. In the third Se site, Se(5) is bonded to one K(2), two equivalent K(1), one As(2), and one As(3) atom to form distorted SeK3As2 square pyramids that share corners with two equivalent Se(5)K3As2 square pyramids,  a cornercorner with one Se(1)K2As2 trigonal pyramid, and  an edgeedge with one Se(1)K2As2 trigonal pyramid. In the fourth Se site, Se(6) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Ag(1), and one As(3) atom. In the fifth Se site, Se(1) is bonded to two equivalent K(2), one As(1), and one As(3) atom to form SeK2As2 trigonal pyramids that share  a cornercorner with one Se(5)K3As2 square pyramid, corners with two equivalent Se(1)K2As2 trigonal pyramids, and  an edgeedge with one Se(5)K3As2 square pyramid. In the sixth Se site, Se(2) is bonded in a 5-coordinate geometry to one K(1), one K(2), two equivalent Ag(1), and one As(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Ag(AsSe2)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.786
_cell_length_b   12.933
_cell_length_c   18.245
_cell_angle_alpha   53.009
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1467.392
_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  0.890  0.590  0.757  1.0
  K  K1  1  0.390  0.410  0.743  1.0
  K  K2  1  0.110  0.410  0.243  1.0
  K  K3  1  0.610  0.590  0.257  1.0
  K  K4  1  0.371  0.786  0.386  1.0
  K  K5  1  0.871  0.214  0.114  1.0
  K  K6  1  0.629  0.214  0.614  1.0
  K  K7  1  0.129  0.786  0.886  1.0
  Ag  Ag8  1  0.993  0.528  0.572  1.0
  Ag  Ag9  1  0.493  0.472  0.928  1.0
  Ag  Ag10  1  0.007  0.472  0.428  1.0
  Ag  Ag11  1  0.507  0.528  0.072  1.0
  As  As12  1  0.089  0.220  0.655  1.0
  As  As13  1  0.589  0.780  0.845  1.0
  As  As14  1  0.911  0.780  0.345  1.0
  As  As15  1  0.411  0.220  0.155  1.0
  As  As16  1  0.944  0.171  0.865  1.0
  As  As17  1  0.444  0.829  0.635  1.0
  As  As18  1  0.056  0.829  0.135  1.0
  As  As19  1  0.556  0.171  0.365  1.0
  As  As20  1  0.327  0.117  0.006  1.0
  As  As21  1  0.827  0.883  0.494  1.0
  As  As22  1  0.673  0.883  0.994  1.0
  As  As23  1  0.173  0.117  0.506  1.0
  Se  Se24  1  0.242  0.049  0.661  1.0
  Se  Se25  1  0.742  0.951  0.839  1.0
  Se  Se26  1  0.758  0.951  0.339  1.0
  Se  Se27  1  0.258  0.049  0.161  1.0
  Se  Se28  1  0.733  0.592  0.442  1.0
  Se  Se29  1  0.233  0.408  0.058  1.0
  Se  Se30  1  0.267  0.408  0.558  1.0
  Se  Se31  1  0.767  0.592  0.942  1.0
  Se  Se32  1  0.204  0.120  0.810  1.0
  Se  Se33  1  0.704  0.880  0.690  1.0
  Se  Se34  1  0.796  0.880  0.190  1.0
  Se  Se35  1  0.296  0.120  0.310  1.0
  Se  Se36  1  0.817  0.350  0.727  1.0
  Se  Se37  1  0.317  0.650  0.773  1.0
  Se  Se38  1  0.183  0.650  0.273  1.0
  Se  Se39  1  0.683  0.350  0.227  1.0
  Se  Se40  1  0.096  0.282  0.919  1.0
  Se  Se41  1  0.596  0.718  0.581  1.0
  Se  Se42  1  0.904  0.718  0.081  1.0
  Se  Se43  1  0.404  0.282  0.419  1.0
  Se  Se44  1  0.074  0.752  0.539  1.0
  Se  Se45  1  0.574  0.248  0.961  1.0
  Se  Se46  1  0.926  0.248  0.461  1.0
  Se  Se47  1  0.426  0.752  0.039  1.0
[/CIF]
.