The compound described by Ag4Sn2(HgSe3)3 is Stannite-like structured and crystallizes in the triclinic P1 space group. There are four inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to one Se(1), one Se(3), one Se(4), and one Se(8) atom to form AgSe4 tetrahedra that share  a cornercorner with one Ag(2)Se4 tetrahedra,  a cornercorner with one Ag(3)Se4 tetrahedra,  a cornercorner with one Ag(4)Se4 tetrahedra,  a cornercorner with one Hg(3)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with three equivalent Hg(1)Se4 tetrahedra, and corners with three equivalent Hg(2)Se4 tetrahedra. In the second Ag site, Ag(2) is bonded to one Se(2), one Se(5), one Se(8), and one Se(9) atom to form AgSe4 tetrahedra that share  a cornercorner with one Ag(1)Se4 tetrahedra,  a cornercorner with one Ag(3)Se4 tetrahedra,  a cornercorner with one Ag(4)Se4 tetrahedra,  a cornercorner with one Hg(1)Se4 tetrahedra,  a cornercorner with one Hg(2)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with three equivalent Hg(3)Se4 tetrahedra, and corners with three equivalent Sn(1)Se4 tetrahedra. In the third Ag site, Ag(3) is bonded to one Se(1), one Se(6), one Se(7), and one Se(9) atom to form AgSe4 tetrahedra that share  a cornercorner with one Ag(1)Se4 tetrahedra,  a cornercorner with one Ag(2)Se4 tetrahedra,  a cornercorner with one Hg(1)Se4 tetrahedra,  a cornercorner with one Hg(2)Se4 tetrahedra,  a cornercorner with one Hg(3)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with three equivalent Ag(4)Se4 tetrahedra, and corners with three equivalent Sn(2)Se4 tetrahedra. In the fourth Ag site, Ag(4) is bonded to one Se(1), one Se(5), one Se(6), and one Se(7) atom to form AgSe4 tetrahedra that share  a cornercorner with one Ag(1)Se4 tetrahedra,  a cornercorner with one Ag(2)Se4 tetrahedra,  a cornercorner with one Hg(1)Se4 tetrahedra,  a cornercorner with one Hg(2)Se4 tetrahedra,  a cornercorner with one Hg(3)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with three equivalent Ag(3)Se4 tetrahedra, and corners with three equivalent Sn(2)Se4 tetrahedra. There are three inequivalent Hg sites. In the first Hg site, Hg(1) is bonded to one Se(3), one Se(4), one Se(7), and one Se(8) atom to form HgSe4 tetrahedra that share  a cornercorner with one Ag(2)Se4 tetrahedra,  a cornercorner with one Ag(3)Se4 tetrahedra,  a cornercorner with one Ag(4)Se4 tetrahedra,  a cornercorner with one Hg(3)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with three equivalent Ag(1)Se4 tetrahedra, and corners with three equivalent Hg(2)Se4 tetrahedra. In the second Hg site, Hg(2) is bonded to one Se(3), one Se(4), one Se(6), and one Se(8) atom to form HgSe4 tetrahedra that share  a cornercorner with one Ag(2)Se4 tetrahedra,  a cornercorner with one Ag(3)Se4 tetrahedra,  a cornercorner with one Ag(4)Se4 tetrahedra,  a cornercorner with one Hg(3)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with three equivalent Ag(1)Se4 tetrahedra, and corners with three equivalent Hg(1)Se4 tetrahedra. In the third Hg site, Hg(3) is bonded to one Se(2), one Se(4), one Se(5), and one Se(9) atom to form HgSe4 tetrahedra that share  a cornercorner with one Ag(1)Se4 tetrahedra,  a cornercorner with one Ag(3)Se4 tetrahedra,  a cornercorner with one Ag(4)Se4 tetrahedra,  a cornercorner with one Hg(1)Se4 tetrahedra,  a cornercorner with one Hg(2)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with three equivalent Ag(2)Se4 tetrahedra, and corners with three equivalent Sn(1)Se4 tetrahedra. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Se(2), one Se(3), one Se(5), and one Se(9) atom to form SnSe4 tetrahedra that share  a cornercorner with one Ag(1)Se4 tetrahedra,  a cornercorner with one Ag(3)Se4 tetrahedra,  a cornercorner with one Ag(4)Se4 tetrahedra,  a cornercorner with one Hg(1)Se4 tetrahedra,  a cornercorner with one Hg(2)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with three equivalent Ag(2)Se4 tetrahedra, and corners with three equivalent Hg(3)Se4 tetrahedra. In the second Sn site, Sn(2) is bonded to one Se(1), one Se(2), one Se(6), and one Se(7) atom to form SnSe4 tetrahedra that share  a cornercorner with one Ag(1)Se4 tetrahedra,  a cornercorner with one Ag(2)Se4 tetrahedra,  a cornercorner with one Hg(1)Se4 tetrahedra,  a cornercorner with one Hg(2)Se4 tetrahedra,  a cornercorner with one Hg(3)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with three equivalent Ag(3)Se4 tetrahedra, and corners with three equivalent Ag(4)Se4 tetrahedra. There are nine inequivalent Se sites. In the first Se site, Se(1) is bonded to one Ag(1), one Ag(3), one Ag(4), and one Sn(2) atom to form SeAg3Sn tetrahedra that share  a cornercorner with one Se(8)Ag2Hg2 tetrahedra,  a cornercorner with one Se(5)Ag2SnHg tetrahedra,  a cornercorner with one Se(9)Ag2SnHg tetrahedra,  a cornercorner with one Se(4)AgHg3 tetrahedra,  a cornercorner with one Se(2)AgSn2Hg tetrahedra,  a cornercorner with one Se(3)AgSnHg2 tetrahedra, corners with three equivalent Se(6)Ag2SnHg tetrahedra, and corners with three equivalent Se(7)Ag2SnHg tetrahedra. In the second Se site, Se(2) is bonded to one Ag(2), one Hg(3), one Sn(1), and one Sn(2) atom to form SeAgSn2Hg tetrahedra that share  a cornercorner with one Se(8)Ag2Hg2 tetrahedra,  a cornercorner with one Se(6)Ag2SnHg tetrahedra,  a cornercorner with one Se(7)Ag2SnHg tetrahedra,  a cornercorner with one Se(1)Ag3Sn tetrahedra,  a cornercorner with one Se(4)AgHg3 tetrahedra,  a cornercorner with one Se(3)AgSnHg2 tetrahedra, corners with three equivalent Se(5)Ag2SnHg tetrahedra, and corners with three equivalent Se(9)Ag2SnHg tetrahedra. In the third Se site, Se(3) is bonded to one Ag(1), one Hg(1), one Hg(2), and one Sn(1) atom to form SeAgSnHg2 tetrahedra that share  a cornercorner with one Se(5)Ag2SnHg tetrahedra,  a cornercorner with one Se(6)Ag2SnHg tetrahedra,  a cornercorner with one Se(7)Ag2SnHg tetrahedra,  a cornercorner with one Se(9)Ag2SnHg tetrahedra,  a cornercorner with one Se(1)Ag3Sn tetrahedra,  a cornercorner with one Se(2)AgSn2Hg tetrahedra, corners with three equivalent Se(8)Ag2Hg2 tetrahedra, and corners with three equivalent Se(4)AgHg3 tetrahedra. In the fourth Se site, Se(4) is bonded to one Ag(1), one Hg(1), one Hg(2), and one Hg(3) atom to form SeAgHg3 tetrahedra that share  a cornercorner with one Se(5)Ag2SnHg tetrahedra,  a cornercorner with one Se(6)Ag2SnHg tetrahedra,  a cornercorner with one Se(7)Ag2SnHg tetrahedra,  a cornercorner with one Se(9)Ag2SnHg tetrahedra,  a cornercorner with one Se(1)Ag3Sn tetrahedra,  a cornercorner with one Se(2)AgSn2Hg tetrahedra, corners with three equivalent Se(8)Ag2Hg2 tetrahedra, and corners with three equivalent Se(3)AgSnHg2 tetrahedra. In the fifth Se site, Se(5) is bonded to one Ag(2), one Ag(4), one Hg(3), and one Sn(1) atom to form SeAg2SnHg tetrahedra that share  a cornercorner with one Se(8)Ag2Hg2 tetrahedra,  a cornercorner with one Se(6)Ag2SnHg tetrahedra,  a cornercorner with one Se(7)Ag2SnHg tetrahedra,  a cornercorner with one Se(1)Ag3Sn tetrahedra,  a cornercorner with one Se(4)AgHg3 tetrahedra,  a cornercorner with one Se(3)AgSnHg2 tetrahedra, corners with three equivalent Se(9)Ag2SnHg tetrahedra, and corners with three equivalent Se(2)AgSn2Hg tetrahedra. In the sixth Se site, Se(6) is bonded to one Ag(3), one Ag(4), one Hg(2), and one Sn(2) atom to form SeAg2SnHg tetrahedra that share  a cornercorner with one Se(8)Ag2Hg2 tetrahedra,  a cornercorner with one Se(5)Ag2SnHg tetrahedra,  a cornercorner with one Se(9)Ag2SnHg tetrahedra,  a cornercorner with one Se(4)AgHg3 tetrahedra,  a cornercorner with one Se(2)AgSn2Hg tetrahedra,  a cornercorner with one Se(3)AgSnHg2 tetrahedra, corners with three equivalent Se(7)Ag2SnHg tetrahedra, and corners with three equivalent Se(1)Ag3Sn tetrahedra. In the seventh Se site, Se(7) is bonded to one Ag(3), one Ag(4), one Hg(1), and one Sn(2) atom to form SeAg2SnHg tetrahedra that share  a cornercorner with one Se(8)Ag2Hg2 tetrahedra,  a cornercorner with one Se(5)Ag2SnHg tetrahedra,  a cornercorner with one Se(9)Ag2SnHg tetrahedra,  a cornercorner with one Se(4)AgHg3 tetrahedra,  a cornercorner with one Se(2)AgSn2Hg tetrahedra,  a cornercorner with one Se(3)AgSnHg2 tetrahedra, corners with three equivalent Se(6)Ag2SnHg tetrahedra, and corners with three equivalent Se(1)Ag3Sn tetrahedra. In the eighth Se site, Se(8) is bonded to one Ag(1), one Ag(2), one Hg(1), and one Hg(2) atom to form SeAg2Hg2 tetrahedra that share  a cornercorner with one Se(5)Ag2SnHg tetrahedra,  a cornercorner with one Se(6)Ag2SnHg tetrahedra,  a cornercorner with one Se(7)Ag2SnHg tetrahedra,  a cornercorner with one Se(9)Ag2SnHg tetrahedra,  a cornercorner with one Se(1)Ag3Sn tetrahedra,  a cornercorner with one Se(2)AgSn2Hg tetrahedra, corners with three equivalent Se(4)AgHg3 tetrahedra, and corners with three equivalent Se(3)AgSnHg2 tetrahedra. In the ninth Se site, Se(9) is bonded to one Ag(2), one Ag(3), one Hg(3), and one Sn(1) atom to form SeAg2SnHg tetrahedra that share  a cornercorner with one Se(8)Ag2Hg2 tetrahedra,  a cornercorner with one Se(6)Ag2SnHg tetrahedra,  a cornercorner with one Se(7)Ag2SnHg tetrahedra,  a cornercorner with one Se(1)Ag3Sn tetrahedra,  a cornercorner with one Se(4)AgHg3 tetrahedra,  a cornercorner with one Se(3)AgSnHg2 tetrahedra, corners with three equivalent Se(5)Ag2SnHg tetrahedra, and corners with three equivalent Se(2)AgSn2Hg tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ag4Sn2(HgSe3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.576
_cell_length_b   7.588
_cell_length_c   10.698
_cell_angle_alpha   90.101
_cell_angle_beta   90.584
_cell_angle_gamma   119.775
_symmetry_Int_Tables_number   1
_cell_volume   533.802
_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
  Ag  Ag0  1  0.682  0.676  0.902  1.0
  Ag  Ag1  1  0.688  0.344  0.239  1.0
  Ag  Ag2  1  0.011  0.679  0.579  1.0
  Ag  Ag3  1  0.679  0.011  0.579  1.0
  Sn  Sn4  1  0.008  0.006  0.242  1.0
  Sn  Sn5  1  0.347  0.347  0.588  1.0
  Hg  Hg6  1  0.366  0.021  0.914  1.0
  Hg  Hg7  1  0.006  0.357  0.914  1.0
  Hg  Hg8  1  0.346  0.701  0.230  1.0
  Se  Se9  1  0.674  0.673  0.653  1.0
  Se  Se10  1  0.344  0.338  0.332  1.0
  Se  Se11  1  0.010  0.009  0.999  1.0
  Se  Se12  1  0.357  0.678  0.985  1.0
  Se  Se13  1  0.694  0.018  0.328  1.0
  Se  Se14  1  0.018  0.346  0.655  1.0
  Se  Se15  1  0.346  0.017  0.655  1.0
  Se  Se16  1  0.680  0.357  0.995  1.0
  Se  Se17  1  0.010  0.686  0.328  1.0
[/CIF]
.
The compound described by Ag4Sn2(HgSe3)3 is Stannite-like structured and crystallizes in the triclinic P1 space group. There are four inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to one Se(1), one Se(3), one Se(4), and one Se(8) atom to form AgSe4 tetrahedra that share  a cornercorner with one Ag(2)Se4 tetrahedra,  a cornercorner with one Ag(3)Se4 tetrahedra,  a cornercorner with one Ag(4)Se4 tetrahedra,  a cornercorner with one Hg(3)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with three equivalent Hg(1)Se4 tetrahedra, and corners with three equivalent Hg(2)Se4 tetrahedra. In the second Ag site, Ag(2) is bonded to one Se(2), one Se(5), one Se(8), and one Se(9) atom to form AgSe4 tetrahedra that share  a cornercorner with one Ag(1)Se4 tetrahedra,  a cornercorner with one Ag(3)Se4 tetrahedra,  a cornercorner with one Ag(4)Se4 tetrahedra,  a cornercorner with one Hg(1)Se4 tetrahedra,  a cornercorner with one Hg(2)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with three equivalent Hg(3)Se4 tetrahedra, and corners with three equivalent Sn(1)Se4 tetrahedra. In the third Ag site, Ag(3) is bonded to one Se(1), one Se(6), one Se(7), and one Se(9) atom to form AgSe4 tetrahedra that share  a cornercorner with one Ag(1)Se4 tetrahedra,  a cornercorner with one Ag(2)Se4 tetrahedra,  a cornercorner with one Hg(1)Se4 tetrahedra,  a cornercorner with one Hg(2)Se4 tetrahedra,  a cornercorner with one Hg(3)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with three equivalent Ag(4)Se4 tetrahedra, and corners with three equivalent Sn(2)Se4 tetrahedra. In the fourth Ag site, Ag(4) is bonded to one Se(1), one Se(5), one Se(6), and one Se(7) atom to form AgSe4 tetrahedra that share  a cornercorner with one Ag(1)Se4 tetrahedra,  a cornercorner with one Ag(2)Se4 tetrahedra,  a cornercorner with one Hg(1)Se4 tetrahedra,  a cornercorner with one Hg(2)Se4 tetrahedra,  a cornercorner with one Hg(3)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with three equivalent Ag(3)Se4 tetrahedra, and corners with three equivalent Sn(2)Se4 tetrahedra. There are three inequivalent Hg sites. In the first Hg site, Hg(1) is bonded to one Se(3), one Se(4), one Se(7), and one Se(8) atom to form HgSe4 tetrahedra that share  a cornercorner with one Ag(2)Se4 tetrahedra,  a cornercorner with one Ag(3)Se4 tetrahedra,  a cornercorner with one Ag(4)Se4 tetrahedra,  a cornercorner with one Hg(3)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with three equivalent Ag(1)Se4 tetrahedra, and corners with three equivalent Hg(2)Se4 tetrahedra. In the second Hg site, Hg(2) is bonded to one Se(3), one Se(4), one Se(6), and one Se(8) atom to form HgSe4 tetrahedra that share  a cornercorner with one Ag(2)Se4 tetrahedra,  a cornercorner with one Ag(3)Se4 tetrahedra,  a cornercorner with one Ag(4)Se4 tetrahedra,  a cornercorner with one Hg(3)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with three equivalent Ag(1)Se4 tetrahedra, and corners with three equivalent Hg(1)Se4 tetrahedra. In the third Hg site, Hg(3) is bonded to one Se(2), one Se(4), one Se(5), and one Se(9) atom to form HgSe4 tetrahedra that share  a cornercorner with one Ag(1)Se4 tetrahedra,  a cornercorner with one Ag(3)Se4 tetrahedra,  a cornercorner with one Ag(4)Se4 tetrahedra,  a cornercorner with one Hg(1)Se4 tetrahedra,  a cornercorner with one Hg(2)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with three equivalent Ag(2)Se4 tetrahedra, and corners with three equivalent Sn(1)Se4 tetrahedra. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Se(2), one Se(3), one Se(5), and one Se(9) atom to form SnSe4 tetrahedra that share  a cornercorner with one Ag(1)Se4 tetrahedra,  a cornercorner with one Ag(3)Se4 tetrahedra,  a cornercorner with one Ag(4)Se4 tetrahedra,  a cornercorner with one Hg(1)Se4 tetrahedra,  a cornercorner with one Hg(2)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with three equivalent Ag(2)Se4 tetrahedra, and corners with three equivalent Hg(3)Se4 tetrahedra. In the second Sn site, Sn(2) is bonded to one Se(1), one Se(2), one Se(6), and one Se(7) atom to form SnSe4 tetrahedra that share  a cornercorner with one Ag(1)Se4 tetrahedra,  a cornercorner with one Ag(2)Se4 tetrahedra,  a cornercorner with one Hg(1)Se4 tetrahedra,  a cornercorner with one Hg(2)Se4 tetrahedra,  a cornercorner with one Hg(3)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with three equivalent Ag(3)Se4 tetrahedra, and corners with three equivalent Ag(4)Se4 tetrahedra. There are nine inequivalent Se sites. In the first Se site, Se(1) is bonded to one Ag(1), one Ag(3), one Ag(4), and one Sn(2) atom to form SeAg3Sn tetrahedra that share  a cornercorner with one Se(8)Ag2Hg2 tetrahedra,  a cornercorner with one Se(5)Ag2SnHg tetrahedra,  a cornercorner with one Se(9)Ag2SnHg tetrahedra,  a cornercorner with one Se(4)AgHg3 tetrahedra,  a cornercorner with one Se(2)AgSn2Hg tetrahedra,  a cornercorner with one Se(3)AgSnHg2 tetrahedra, corners with three equivalent Se(6)Ag2SnHg tetrahedra, and corners with three equivalent Se(7)Ag2SnHg tetrahedra. In the second Se site, Se(2) is bonded to one Ag(2), one Hg(3), one Sn(1), and one Sn(2) atom to form SeAgSn2Hg tetrahedra that share  a cornercorner with one Se(8)Ag2Hg2 tetrahedra,  a cornercorner with one Se(6)Ag2SnHg tetrahedra,  a cornercorner with one Se(7)Ag2SnHg tetrahedra,  a cornercorner with one Se(1)Ag3Sn tetrahedra,  a cornercorner with one Se(4)AgHg3 tetrahedra,  a cornercorner with one Se(3)AgSnHg2 tetrahedra, corners with three equivalent Se(5)Ag2SnHg tetrahedra, and corners with three equivalent Se(9)Ag2SnHg tetrahedra. In the third Se site, Se(3) is bonded to one Ag(1), one Hg(1), one Hg(2), and one Sn(1) atom to form SeAgSnHg2 tetrahedra that share  a cornercorner with one Se(5)Ag2SnHg tetrahedra,  a cornercorner with one Se(6)Ag2SnHg tetrahedra,  a cornercorner with one Se(7)Ag2SnHg tetrahedra,  a cornercorner with one Se(9)Ag2SnHg tetrahedra,  a cornercorner with one Se(1)Ag3Sn tetrahedra,  a cornercorner with one Se(2)AgSn2Hg tetrahedra, corners with three equivalent Se(8)Ag2Hg2 tetrahedra, and corners with three equivalent Se(4)AgHg3 tetrahedra. In the fourth Se site, Se(4) is bonded to one Ag(1), one Hg(1), one Hg(2), and one Hg(3) atom to form SeAgHg3 tetrahedra that share  a cornercorner with one Se(5)Ag2SnHg tetrahedra,  a cornercorner with one Se(6)Ag2SnHg tetrahedra,  a cornercorner with one Se(7)Ag2SnHg tetrahedra,  a cornercorner with one Se(9)Ag2SnHg tetrahedra,  a cornercorner with one Se(1)Ag3Sn tetrahedra,  a cornercorner with one Se(2)AgSn2Hg tetrahedra, corners with three equivalent Se(8)Ag2Hg2 tetrahedra, and corners with three equivalent Se(3)AgSnHg2 tetrahedra. In the fifth Se site, Se(5) is bonded to one Ag(2), one Ag(4), one Hg(3), and one Sn(1) atom to form SeAg2SnHg tetrahedra that share  a cornercorner with one Se(8)Ag2Hg2 tetrahedra,  a cornercorner with one Se(6)Ag2SnHg tetrahedra,  a cornercorner with one Se(7)Ag2SnHg tetrahedra,  a cornercorner with one Se(1)Ag3Sn tetrahedra,  a cornercorner with one Se(4)AgHg3 tetrahedra,  a cornercorner with one Se(3)AgSnHg2 tetrahedra, corners with three equivalent Se(9)Ag2SnHg tetrahedra, and corners with three equivalent Se(2)AgSn2Hg tetrahedra. In the sixth Se site, Se(6) is bonded to one Ag(3), one Ag(4), one Hg(2), and one Sn(2) atom to form SeAg2SnHg tetrahedra that share  a cornercorner with one Se(8)Ag2Hg2 tetrahedra,  a cornercorner with one Se(5)Ag2SnHg tetrahedra,  a cornercorner with one Se(9)Ag2SnHg tetrahedra,  a cornercorner with one Se(4)AgHg3 tetrahedra,  a cornercorner with one Se(2)AgSn2Hg tetrahedra,  a cornercorner with one Se(3)AgSnHg2 tetrahedra, corners with three equivalent Se(7)Ag2SnHg tetrahedra, and corners with three equivalent Se(1)Ag3Sn tetrahedra. In the seventh Se site, Se(7) is bonded to one Ag(3), one Ag(4), one Hg(1), and one Sn(2) atom to form SeAg2SnHg tetrahedra that share  a cornercorner with one Se(8)Ag2Hg2 tetrahedra,  a cornercorner with one Se(5)Ag2SnHg tetrahedra,  a cornercorner with one Se(9)Ag2SnHg tetrahedra,  a cornercorner with one Se(4)AgHg3 tetrahedra,  a cornercorner with one Se(2)AgSn2Hg tetrahedra,  a cornercorner with one Se(3)AgSnHg2 tetrahedra, corners with three equivalent Se(6)Ag2SnHg tetrahedra, and corners with three equivalent Se(1)Ag3Sn tetrahedra. In the eighth Se site, Se(8) is bonded to one Ag(1), one Ag(2), one Hg(1), and one Hg(2) atom to form SeAg2Hg2 tetrahedra that share  a cornercorner with one Se(5)Ag2SnHg tetrahedra,  a cornercorner with one Se(6)Ag2SnHg tetrahedra,  a cornercorner with one Se(7)Ag2SnHg tetrahedra,  a cornercorner with one Se(9)Ag2SnHg tetrahedra,  a cornercorner with one Se(1)Ag3Sn tetrahedra,  a cornercorner with one Se(2)AgSn2Hg tetrahedra, corners with three equivalent Se(4)AgHg3 tetrahedra, and corners with three equivalent Se(3)AgSnHg2 tetrahedra. In the ninth Se site, Se(9) is bonded to one Ag(2), one Ag(3), one Hg(3), and one Sn(1) atom to form SeAg2SnHg tetrahedra that share  a cornercorner with one Se(8)Ag2Hg2 tetrahedra,  a cornercorner with one Se(6)Ag2SnHg tetrahedra,  a cornercorner with one Se(7)Ag2SnHg tetrahedra,  a cornercorner with one Se(1)Ag3Sn tetrahedra,  a cornercorner with one Se(4)AgHg3 tetrahedra,  a cornercorner with one Se(3)AgSnHg2 tetrahedra, corners with three equivalent Se(5)Ag2SnHg tetrahedra, and corners with three equivalent Se(2)AgSn2Hg tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ag4Sn2(HgSe3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.576
_cell_length_b   7.588
_cell_length_c   10.698
_cell_angle_alpha   90.101
_cell_angle_beta   90.584
_cell_angle_gamma   119.775
_symmetry_Int_Tables_number   1
_cell_volume   533.802
_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
  Ag  Ag0  1  0.682  0.676  0.902  1.0
  Ag  Ag1  1  0.688  0.344  0.239  1.0
  Ag  Ag2  1  0.011  0.679  0.579  1.0
  Ag  Ag3  1  0.679  0.011  0.579  1.0
  Sn  Sn4  1  0.008  0.006  0.242  1.0
  Sn  Sn5  1  0.347  0.347  0.588  1.0
  Hg  Hg6  1  0.366  0.021  0.914  1.0
  Hg  Hg7  1  0.006  0.357  0.914  1.0
  Hg  Hg8  1  0.346  0.701  0.230  1.0
  Se  Se9  1  0.674  0.673  0.653  1.0
  Se  Se10  1  0.344  0.338  0.332  1.0
  Se  Se11  1  0.010  0.009  0.999  1.0
  Se  Se12  1  0.357  0.678  0.985  1.0
  Se  Se13  1  0.694  0.018  0.328  1.0
  Se  Se14  1  0.018  0.346  0.655  1.0
  Se  Se15  1  0.346  0.017  0.655  1.0
  Se  Se16  1  0.680  0.357  0.995  1.0
  Se  Se17  1  0.010  0.686  0.328  1.0
[/CIF]
.