The crystal structure described by Ga2(Hg4Te5)3 crystallizes in the monoclinic Cm space group. There are eight inequivalent Hg sites. In the first Hg site, Hg(1) is bonded to one Te(1), one Te(8), and two equivalent Te(3) atoms to form HgTe4 tetrahedra that share  a cornercorner with one Hg(2)Te4 tetrahedra, corners with two equivalent Hg(5)Te4 tetrahedra, corners with two equivalent Ga(1)Te4 tetrahedra, and corners with six equivalent Hg(3)Te4 tetrahedra. In the second Hg site, Hg(2) is bonded to one Te(1), one Te(2), and two equivalent Te(5) atoms to form corner-sharing HgTe4 tetrahedra. In the third Hg site, Hg(3) is bonded to one Te(1), one Te(10), and two equivalent Te(3) atoms to form HgTe4 tetrahedra that share  a cornercorner with one Hg(2)Te4 tetrahedra, corners with two equivalent Hg(5)Te4 tetrahedra, corners with two equivalent Ga(1)Te4 tetrahedra, corners with three equivalent Hg(1)Te4 tetrahedra, and corners with three equivalent Hg(3)Te4 tetrahedra. In the fourth Hg site, Hg(4) is bonded to one Te(2), one Te(4), and two equivalent Te(7) atoms to form corner-sharing HgTe4 tetrahedra. In the fifth Hg site, Hg(5) is bonded to one Te(2), one Te(3), and two equivalent Te(5) atoms to form corner-sharing HgTe4 tetrahedra. In the sixth Hg site, Hg(6) is bonded to one Te(4), one Te(6), and two equivalent Te(9) atoms to form HgTe4 tetrahedra that share  a cornercorner with one Hg(4)Te4 tetrahedra, corners with two equivalent Hg(7)Te4 tetrahedra, corners with two equivalent Ga(1)Te4 tetrahedra, and corners with six equivalent Hg(8)Te4 tetrahedra. In the seventh Hg site, Hg(7) is bonded to one Te(4), one Te(5), and two equivalent Te(7) atoms to form corner-sharing HgTe4 tetrahedra. In the eighth Hg site, Hg(8) is bonded to one Te(6), one Te(7), and two equivalent Te(9) atoms to form HgTe4 tetrahedra that share  a cornercorner with one Hg(4)Te4 tetrahedra, corners with two equivalent Hg(7)Te4 tetrahedra, corners with two equivalent Ga(1)Te4 tetrahedra, corners with three equivalent Hg(6)Te4 tetrahedra, and corners with three equivalent Hg(8)Te4 tetrahedra. Ga(1) is bonded to one Te(8), one Te(9), and two equivalent Te(10) atoms to form GaTe4 tetrahedra that share  a cornercorner with one Hg(1)Te4 tetrahedra,  a cornercorner with one Hg(6)Te4 tetrahedra, corners with two equivalent Hg(3)Te4 tetrahedra, corners with two equivalent Hg(8)Te4 tetrahedra, and corners with three equivalent Ga(1)Te4 tetrahedra. There are ten inequivalent Te sites. In the first Te site, Te(1) is bonded to one Hg(1), one Hg(2), and two equivalent Hg(3) atoms to form corner-sharing TeHg4 tetrahedra. In the second Te site, Te(2) is bonded to one Hg(2), one Hg(4), and two equivalent Hg(5) atoms to form corner-sharing TeHg4 tetrahedra. In the third Te site, Te(3) is bonded to one Hg(1), one Hg(5), and two equivalent Hg(3) atoms to form corner-sharing TeHg4 tetrahedra. In the fourth Te site, Te(4) is bonded to one Hg(4), one Hg(6), and two equivalent Hg(7) atoms to form TeHg4 tetrahedra that share  a cornercorner with one Te(2)Hg4 tetrahedra, corners with two equivalent Te(9)GaHg3 tetrahedra, corners with two equivalent Te(5)Hg4 tetrahedra, and corners with six equivalent Te(7)Hg4 tetrahedra. In the fifth Te site, Te(5) is bonded to one Hg(2), one Hg(7), and two equivalent Hg(5) atoms to form corner-sharing TeHg4 tetrahedra. In the sixth Te site, Te(6) is bonded in a trigonal non-coplanar geometry to one Hg(6) and two equivalent Hg(8) atoms. In the seventh Te site, Te(7) is bonded to one Hg(4), one Hg(8), and two equivalent Hg(7) atoms to form TeHg4 tetrahedra that share  a cornercorner with one Te(2)Hg4 tetrahedra, corners with two equivalent Te(9)GaHg3 tetrahedra, corners with two equivalent Te(5)Hg4 tetrahedra, corners with three equivalent Te(4)Hg4 tetrahedra, and corners with three equivalent Te(7)Hg4 tetrahedra. In the eighth Te site, Te(8) is bonded in a trigonal non-coplanar geometry to one Hg(1) and two equivalent Ga(1) atoms. In the ninth Te site, Te(9) is bonded to one Hg(6), two equivalent Hg(8), and one Ga(1) atom to form TeGaHg3 tetrahedra that share  a cornercorner with one Te(4)Hg4 tetrahedra, corners with two equivalent Te(7)Hg4 tetrahedra, and corners with three equivalent Te(9)GaHg3 tetrahedra. In the tenth Te site, Te(10) is bonded in a trigonal non-coplanar geometry to one Hg(3) and two equivalent Ga(1) atoms. is represented by the CIF file [CIF]
data_Ga2(Hg4Te5)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.066
_cell_length_b   8.066
_cell_length_c   18.987
_cell_angle_alpha   85.950
_cell_angle_beta   85.950
_cell_angle_gamma   120.016
_symmetry_Int_Tables_number   1
_cell_volume   1058.846
_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
  Ga  Ga0  1  0.266  0.933  0.202  1.0
  Ga  Ga1  1  0.933  0.266  0.202  1.0
  Hg  Hg2  1  0.005  0.005  0.009  1.0
  Hg  Hg3  1  0.400  0.400  0.803  1.0
  Hg  Hg4  1  0.664  0.322  0.008  1.0
  Hg  Hg5  1  0.798  0.798  0.596  1.0
  Hg  Hg6  1  0.065  0.732  0.803  1.0
  Hg  Hg7  1  0.229  0.229  0.391  1.0
  Hg  Hg8  1  0.322  0.664  0.008  1.0
  Hg  Hg9  1  0.468  0.138  0.597  1.0
  Hg  Hg10  1  0.732  0.065  0.803  1.0
  Hg  Hg11  1  0.844  0.536  0.391  1.0
  Hg  Hg12  1  0.138  0.468  0.597  1.0
  Hg  Hg13  1  0.536  0.844  0.391  1.0
  Te  Te14  1  0.354  0.354  0.956  1.0
  Te  Te15  1  0.750  0.750  0.750  1.0
  Te  Te16  1  0.008  0.681  0.956  1.0
  Te  Te17  1  0.150  0.150  0.544  1.0
  Te  Te18  1  0.416  0.083  0.751  1.0
  Te  Te19  1  0.559  0.559  0.323  1.0
  Te  Te20  1  0.681  0.008  0.956  1.0
  Te  Te21  1  0.821  0.485  0.544  1.0
  Te  Te22  1  0.966  0.966  0.162  1.0
  Te  Te23  1  0.083  0.416  0.751  1.0
  Te  Te24  1  0.219  0.885  0.344  1.0
  Te  Te25  1  0.485  0.821  0.544  1.0
  Te  Te26  1  0.613  0.259  0.162  1.0
  Te  Te27  1  0.885  0.219  0.344  1.0
  Te  Te28  1  0.259  0.613  0.162  1.0
[/CIF]
.
The crystal structure described by Ga2(Hg4Te5)3 crystallizes in the monoclinic Cm space group. There are eight inequivalent Hg sites. In the first Hg site, Hg(1) is bonded to one Te(1), one Te(8), and two equivalent Te(3) atoms to form HgTe4 tetrahedra that share  a cornercorner with one Hg(2)Te4 tetrahedra, corners with two equivalent Hg(5)Te4 tetrahedra, corners with two equivalent Ga(1)Te4 tetrahedra, and corners with six equivalent Hg(3)Te4 tetrahedra. In the second Hg site, Hg(2) is bonded to one Te(1), one Te(2), and two equivalent Te(5) atoms to form corner-sharing HgTe4 tetrahedra. In the third Hg site, Hg(3) is bonded to one Te(1), one Te(10), and two equivalent Te(3) atoms to form HgTe4 tetrahedra that share  a cornercorner with one Hg(2)Te4 tetrahedra, corners with two equivalent Hg(5)Te4 tetrahedra, corners with two equivalent Ga(1)Te4 tetrahedra, corners with three equivalent Hg(1)Te4 tetrahedra, and corners with three equivalent Hg(3)Te4 tetrahedra. In the fourth Hg site, Hg(4) is bonded to one Te(2), one Te(4), and two equivalent Te(7) atoms to form corner-sharing HgTe4 tetrahedra. In the fifth Hg site, Hg(5) is bonded to one Te(2), one Te(3), and two equivalent Te(5) atoms to form corner-sharing HgTe4 tetrahedra. In the sixth Hg site, Hg(6) is bonded to one Te(4), one Te(6), and two equivalent Te(9) atoms to form HgTe4 tetrahedra that share  a cornercorner with one Hg(4)Te4 tetrahedra, corners with two equivalent Hg(7)Te4 tetrahedra, corners with two equivalent Ga(1)Te4 tetrahedra, and corners with six equivalent Hg(8)Te4 tetrahedra. In the seventh Hg site, Hg(7) is bonded to one Te(4), one Te(5), and two equivalent Te(7) atoms to form corner-sharing HgTe4 tetrahedra. In the eighth Hg site, Hg(8) is bonded to one Te(6), one Te(7), and two equivalent Te(9) atoms to form HgTe4 tetrahedra that share  a cornercorner with one Hg(4)Te4 tetrahedra, corners with two equivalent Hg(7)Te4 tetrahedra, corners with two equivalent Ga(1)Te4 tetrahedra, corners with three equivalent Hg(6)Te4 tetrahedra, and corners with three equivalent Hg(8)Te4 tetrahedra. Ga(1) is bonded to one Te(8), one Te(9), and two equivalent Te(10) atoms to form GaTe4 tetrahedra that share  a cornercorner with one Hg(1)Te4 tetrahedra,  a cornercorner with one Hg(6)Te4 tetrahedra, corners with two equivalent Hg(3)Te4 tetrahedra, corners with two equivalent Hg(8)Te4 tetrahedra, and corners with three equivalent Ga(1)Te4 tetrahedra. There are ten inequivalent Te sites. In the first Te site, Te(1) is bonded to one Hg(1), one Hg(2), and two equivalent Hg(3) atoms to form corner-sharing TeHg4 tetrahedra. In the second Te site, Te(2) is bonded to one Hg(2), one Hg(4), and two equivalent Hg(5) atoms to form corner-sharing TeHg4 tetrahedra. In the third Te site, Te(3) is bonded to one Hg(1), one Hg(5), and two equivalent Hg(3) atoms to form corner-sharing TeHg4 tetrahedra. In the fourth Te site, Te(4) is bonded to one Hg(4), one Hg(6), and two equivalent Hg(7) atoms to form TeHg4 tetrahedra that share  a cornercorner with one Te(2)Hg4 tetrahedra, corners with two equivalent Te(9)GaHg3 tetrahedra, corners with two equivalent Te(5)Hg4 tetrahedra, and corners with six equivalent Te(7)Hg4 tetrahedra. In the fifth Te site, Te(5) is bonded to one Hg(2), one Hg(7), and two equivalent Hg(5) atoms to form corner-sharing TeHg4 tetrahedra. In the sixth Te site, Te(6) is bonded in a trigonal non-coplanar geometry to one Hg(6) and two equivalent Hg(8) atoms. In the seventh Te site, Te(7) is bonded to one Hg(4), one Hg(8), and two equivalent Hg(7) atoms to form TeHg4 tetrahedra that share  a cornercorner with one Te(2)Hg4 tetrahedra, corners with two equivalent Te(9)GaHg3 tetrahedra, corners with two equivalent Te(5)Hg4 tetrahedra, corners with three equivalent Te(4)Hg4 tetrahedra, and corners with three equivalent Te(7)Hg4 tetrahedra. In the eighth Te site, Te(8) is bonded in a trigonal non-coplanar geometry to one Hg(1) and two equivalent Ga(1) atoms. In the ninth Te site, Te(9) is bonded to one Hg(6), two equivalent Hg(8), and one Ga(1) atom to form TeGaHg3 tetrahedra that share  a cornercorner with one Te(4)Hg4 tetrahedra, corners with two equivalent Te(7)Hg4 tetrahedra, and corners with three equivalent Te(9)GaHg3 tetrahedra. In the tenth Te site, Te(10) is bonded in a trigonal non-coplanar geometry to one Hg(3) and two equivalent Ga(1) atoms. is represented by the CIF file [CIF]
data_Ga2(Hg4Te5)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.066
_cell_length_b   8.066
_cell_length_c   18.987
_cell_angle_alpha   85.950
_cell_angle_beta   85.950
_cell_angle_gamma   120.016
_symmetry_Int_Tables_number   1
_cell_volume   1058.846
_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
  Ga  Ga0  1  0.266  0.933  0.202  1.0
  Ga  Ga1  1  0.933  0.266  0.202  1.0
  Hg  Hg2  1  0.005  0.005  0.009  1.0
  Hg  Hg3  1  0.400  0.400  0.803  1.0
  Hg  Hg4  1  0.664  0.322  0.008  1.0
  Hg  Hg5  1  0.798  0.798  0.596  1.0
  Hg  Hg6  1  0.065  0.732  0.803  1.0
  Hg  Hg7  1  0.229  0.229  0.391  1.0
  Hg  Hg8  1  0.322  0.664  0.008  1.0
  Hg  Hg9  1  0.468  0.138  0.597  1.0
  Hg  Hg10  1  0.732  0.065  0.803  1.0
  Hg  Hg11  1  0.844  0.536  0.391  1.0
  Hg  Hg12  1  0.138  0.468  0.597  1.0
  Hg  Hg13  1  0.536  0.844  0.391  1.0
  Te  Te14  1  0.354  0.354  0.956  1.0
  Te  Te15  1  0.750  0.750  0.750  1.0
  Te  Te16  1  0.008  0.681  0.956  1.0
  Te  Te17  1  0.150  0.150  0.544  1.0
  Te  Te18  1  0.416  0.083  0.751  1.0
  Te  Te19  1  0.559  0.559  0.323  1.0
  Te  Te20  1  0.681  0.008  0.956  1.0
  Te  Te21  1  0.821  0.485  0.544  1.0
  Te  Te22  1  0.966  0.966  0.162  1.0
  Te  Te23  1  0.083  0.416  0.751  1.0
  Te  Te24  1  0.219  0.885  0.344  1.0
  Te  Te25  1  0.485  0.821  0.544  1.0
  Te  Te26  1  0.613  0.259  0.162  1.0
  Te  Te27  1  0.885  0.219  0.344  1.0
  Te  Te28  1  0.259  0.613  0.162  1.0
[/CIF]
.