The structure described by Rb2Ag(AsSe2)3 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Rb sites. In the first Rb site, Rb(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 Rb site, Rb(2) is bonded in a 9-coordinate geometry to one As(1), one Se(3), one Se(4), one Se(5), one Se(6), two equivalent Se(1), and two equivalent Se(2) 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 Rb(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 Rb(1), one Rb(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 Rb(2), two equivalent Rb(1), one Ag(1), and one As(2) atom. In the third Se site, Se(5) is bonded to one Rb(2), two equivalent Rb(1), one As(2), and one As(3) atom to form distorted SeRb3As2 square pyramids that share corners with two equivalent Se(5)Rb3As2 square pyramids,  a cornercorner with one Se(1)Rb2As2 trigonal pyramid, and  an edgeedge with one Se(1)Rb2As2 trigonal pyramid. In the fourth Se site, Se(6) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Ag(1), and one As(3) atom. In the fifth Se site, Se(1) is bonded to two equivalent Rb(2), one As(1), and one As(3) atom to form distorted SeRb2As2 trigonal pyramids that share  a cornercorner with one Se(5)Rb3As2 square pyramid, corners with two equivalent Se(1)Rb2As2 trigonal pyramids, and  an edgeedge with one Se(5)Rb3As2 square pyramid. In the sixth Se site, Se(2) is bonded in a 6-coordinate geometry to one Rb(1), two equivalent Rb(2), two equivalent Ag(1), and one As(1) atom. is represented by the CIF file [CIF]
data_Rb2Ag(AsSe2)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.035
_cell_length_b   13.085
_cell_length_c   18.604
_cell_angle_alpha   52.383
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1549.312
_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
  Rb  Rb0  1  0.899  0.585  0.763  1.0
  Rb  Rb1  1  0.399  0.415  0.737  1.0
  Rb  Rb2  1  0.101  0.415  0.237  1.0
  Rb  Rb3  1  0.601  0.585  0.263  1.0
  Rb  Rb4  1  0.372  0.781  0.389  1.0
  Rb  Rb5  1  0.872  0.219  0.111  1.0
  Rb  Rb6  1  0.628  0.219  0.611  1.0
  Rb  Rb7  1  0.128  0.781  0.889  1.0
  Ag  Ag8  1  0.993  0.528  0.573  1.0
  Ag  Ag9  1  0.493  0.472  0.927  1.0
  Ag  Ag10  1  0.007  0.472  0.427  1.0
  Ag  Ag11  1  0.507  0.528  0.073  1.0
  As  As12  1  0.090  0.222  0.652  1.0
  As  As13  1  0.590  0.778  0.848  1.0
  As  As14  1  0.910  0.778  0.348  1.0
  As  As15  1  0.410  0.222  0.152  1.0
  As  As16  1  0.958  0.166  0.863  1.0
  As  As17  1  0.458  0.834  0.637  1.0
  As  As18  1  0.042  0.834  0.137  1.0
  As  As19  1  0.542  0.166  0.363  1.0
  As  As20  1  0.332  0.115  0.006  1.0
  As  As21  1  0.832  0.885  0.494  1.0
  As  As22  1  0.668  0.885  0.994  1.0
  As  As23  1  0.168  0.115  0.506  1.0
  Se  Se24  1  0.239  0.052  0.658  1.0
  Se  Se25  1  0.739  0.948  0.842  1.0
  Se  Se26  1  0.761  0.948  0.342  1.0
  Se  Se27  1  0.261  0.052  0.158  1.0
  Se  Se28  1  0.742  0.588  0.446  1.0
  Se  Se29  1  0.242  0.412  0.054  1.0
  Se  Se30  1  0.258  0.412  0.554  1.0
  Se  Se31  1  0.758  0.588  0.946  1.0
  Se  Se32  1  0.205  0.119  0.805  1.0
  Se  Se33  1  0.705  0.881  0.695  1.0
  Se  Se34  1  0.795  0.881  0.195  1.0
  Se  Se35  1  0.295  0.119  0.305  1.0
  Se  Se36  1  0.830  0.345  0.729  1.0
  Se  Se37  1  0.330  0.655  0.771  1.0
  Se  Se38  1  0.170  0.655  0.271  1.0
  Se  Se39  1  0.670  0.345  0.229  1.0
  Se  Se40  1  0.106  0.276  0.916  1.0
  Se  Se41  1  0.606  0.724  0.584  1.0
  Se  Se42  1  0.894  0.724  0.084  1.0
  Se  Se43  1  0.394  0.276  0.416  1.0
  Se  Se44  1  0.069  0.751  0.540  1.0
  Se  Se45  1  0.569  0.249  0.960  1.0
  Se  Se46  1  0.931  0.249  0.460  1.0
  Se  Se47  1  0.431  0.751  0.040  1.0
[/CIF]
.
The structure described by Rb2Ag(AsSe2)3 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Rb sites. In the first Rb site, Rb(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 Rb site, Rb(2) is bonded in a 9-coordinate geometry to one As(1), one Se(3), one Se(4), one Se(5), one Se(6), two equivalent Se(1), and two equivalent Se(2) 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 Rb(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 Rb(1), one Rb(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 Rb(2), two equivalent Rb(1), one Ag(1), and one As(2) atom. In the third Se site, Se(5) is bonded to one Rb(2), two equivalent Rb(1), one As(2), and one As(3) atom to form distorted SeRb3As2 square pyramids that share corners with two equivalent Se(5)Rb3As2 square pyramids,  a cornercorner with one Se(1)Rb2As2 trigonal pyramid, and  an edgeedge with one Se(1)Rb2As2 trigonal pyramid. In the fourth Se site, Se(6) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Ag(1), and one As(3) atom. In the fifth Se site, Se(1) is bonded to two equivalent Rb(2), one As(1), and one As(3) atom to form distorted SeRb2As2 trigonal pyramids that share  a cornercorner with one Se(5)Rb3As2 square pyramid, corners with two equivalent Se(1)Rb2As2 trigonal pyramids, and  an edgeedge with one Se(5)Rb3As2 square pyramid. In the sixth Se site, Se(2) is bonded in a 6-coordinate geometry to one Rb(1), two equivalent Rb(2), two equivalent Ag(1), and one As(1) atom. is represented by the CIF file [CIF]
data_Rb2Ag(AsSe2)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.035
_cell_length_b   13.085
_cell_length_c   18.604
_cell_angle_alpha   52.383
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1549.312
_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
  Rb  Rb0  1  0.899  0.585  0.763  1.0
  Rb  Rb1  1  0.399  0.415  0.737  1.0
  Rb  Rb2  1  0.101  0.415  0.237  1.0
  Rb  Rb3  1  0.601  0.585  0.263  1.0
  Rb  Rb4  1  0.372  0.781  0.389  1.0
  Rb  Rb5  1  0.872  0.219  0.111  1.0
  Rb  Rb6  1  0.628  0.219  0.611  1.0
  Rb  Rb7  1  0.128  0.781  0.889  1.0
  Ag  Ag8  1  0.993  0.528  0.573  1.0
  Ag  Ag9  1  0.493  0.472  0.927  1.0
  Ag  Ag10  1  0.007  0.472  0.427  1.0
  Ag  Ag11  1  0.507  0.528  0.073  1.0
  As  As12  1  0.090  0.222  0.652  1.0
  As  As13  1  0.590  0.778  0.848  1.0
  As  As14  1  0.910  0.778  0.348  1.0
  As  As15  1  0.410  0.222  0.152  1.0
  As  As16  1  0.958  0.166  0.863  1.0
  As  As17  1  0.458  0.834  0.637  1.0
  As  As18  1  0.042  0.834  0.137  1.0
  As  As19  1  0.542  0.166  0.363  1.0
  As  As20  1  0.332  0.115  0.006  1.0
  As  As21  1  0.832  0.885  0.494  1.0
  As  As22  1  0.668  0.885  0.994  1.0
  As  As23  1  0.168  0.115  0.506  1.0
  Se  Se24  1  0.239  0.052  0.658  1.0
  Se  Se25  1  0.739  0.948  0.842  1.0
  Se  Se26  1  0.761  0.948  0.342  1.0
  Se  Se27  1  0.261  0.052  0.158  1.0
  Se  Se28  1  0.742  0.588  0.446  1.0
  Se  Se29  1  0.242  0.412  0.054  1.0
  Se  Se30  1  0.258  0.412  0.554  1.0
  Se  Se31  1  0.758  0.588  0.946  1.0
  Se  Se32  1  0.205  0.119  0.805  1.0
  Se  Se33  1  0.705  0.881  0.695  1.0
  Se  Se34  1  0.795  0.881  0.195  1.0
  Se  Se35  1  0.295  0.119  0.305  1.0
  Se  Se36  1  0.830  0.345  0.729  1.0
  Se  Se37  1  0.330  0.655  0.771  1.0
  Se  Se38  1  0.170  0.655  0.271  1.0
  Se  Se39  1  0.670  0.345  0.229  1.0
  Se  Se40  1  0.106  0.276  0.916  1.0
  Se  Se41  1  0.606  0.724  0.584  1.0
  Se  Se42  1  0.894  0.724  0.084  1.0
  Se  Se43  1  0.394  0.276  0.416  1.0
  Se  Se44  1  0.069  0.751  0.540  1.0
  Se  Se45  1  0.569  0.249  0.960  1.0
  Se  Se46  1  0.931  0.249  0.460  1.0
  Se  Se47  1  0.431  0.751  0.040  1.0
[/CIF]
.