The material structure described by Ta12Ga3(TeSe2)8 crystallizes in the triclinic P1 space group. There are twelve inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 6-coordinate geometry to one Te(2), one Te(5), one Te(8), one Se(10), one Se(4), and one Se(7) atom. In the second Ta site, Ta(2) is bonded in a 6-coordinate geometry to one Te(3), one Te(6), one Se(11), one Se(16), one Se(5), and one Se(8) atom. In the third Ta site, Ta(3) is bonded in a 6-coordinate geometry to one Te(1), one Te(4), one Te(7), one Se(12), one Se(6), and one Se(9) atom. In the fourth Ta site, Ta(4) is bonded in a 6-coordinate geometry to one Te(5), one Te(8), one Se(1), one Se(10), one Se(15), and one Se(7) atom. In the fifth Ta site, Ta(5) is bonded in a 6-coordinate geometry to one Te(3), one Te(6), one Se(11), one Se(13), one Se(2), and one Se(8) atom. In the sixth Ta site, Ta(6) is bonded in a 6-coordinate geometry to one Te(4), one Te(7), one Se(12), one Se(14), one Se(3), and one Se(9) atom. In the seventh Ta site, Ta(7) is bonded in a 6-coordinate geometry to one Te(6), one Se(1), one Se(10), one Se(13), one Se(16), and one Se(4) atom. In the eighth Ta site, Ta(8) is bonded in a 6-coordinate geometry to one Te(1), one Te(7), one Se(11), one Se(14), one Se(2), and one Se(5) atom. In the ninth Ta site, Ta(9) is bonded in a 6-coordinate geometry to one Te(2), one Te(8), one Se(12), one Se(15), one Se(3), and one Se(6) atom. In the tenth Ta site, Ta(10) is bonded in a 6-coordinate geometry to one Te(2), one Te(5), one Se(1), one Se(15), one Se(4), and one Se(7) atom. In the eleventh Ta site, Ta(11) is bonded in a 6-coordinate geometry to one Te(3), one Se(13), one Se(16), one Se(2), one Se(5), and one Se(8) atom. In the twelfth Ta site, Ta(12) is bonded in a 6-coordinate geometry to one Te(1), one Te(4), one Se(14), one Se(3), one Se(6), and one Se(9) atom. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a tetrahedral geometry to one Te(2), one Te(4), one Te(8), and one Se(15) atom. In the second Ga site, Ga(2) is bonded in a tetrahedral geometry to one Te(5), one Te(6), one Se(13), and one Se(16) atom. In the third Ga site, Ga(3) is bonded in a tetrahedral geometry to one Te(1), one Te(3), one Te(7), and one Se(14) atom. There are eight inequivalent Te sites. In the first Te site, Te(1) is bonded to one Ta(12), one Ta(3), one Ta(8), and one Ga(3) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(3)Ta3Ga tetrahedra,  a cornercorner with one Te(7)Ta3Ga tetrahedra,  a cornercorner with one Se(14)Ta3Ga tetrahedra,  an edgeedge with one Te(4)Ta3Ga tetrahedra,  an edgeedge with one Te(7)Ta3Ga tetrahedra, and  an edgeedge with one Se(14)Ta3Ga tetrahedra. In the second Te site, Te(2) is bonded to one Ta(1), one Ta(10), one Ta(9), and one Ga(1) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(4)Ta3Ga tetrahedra,  a cornercorner with one Te(8)Ta3Ga tetrahedra,  a cornercorner with one Se(15)Ta3Ga tetrahedra,  an edgeedge with one Te(5)Ta3Ga tetrahedra,  an edgeedge with one Te(8)Ta3Ga tetrahedra, and  an edgeedge with one Se(15)Ta3Ga tetrahedra. In the third Te site, Te(3) is bonded to one Ta(11), one Ta(2), one Ta(5), and one Ga(3) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(1)Ta3Ga tetrahedra,  a cornercorner with one Te(7)Ta3Ga tetrahedra,  a cornercorner with one Se(14)Ta3Ga tetrahedra,  an edgeedge with one Te(6)Ta3Ga tetrahedra,  an edgeedge with one Se(13)Ta3Ga tetrahedra, and  an edgeedge with one Se(16)Ta3Ga tetrahedra. In the fourth Te site, Te(4) is bonded to one Ta(12), one Ta(3), one Ta(6), and one Ga(1) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(2)Ta3Ga tetrahedra,  a cornercorner with one Te(8)Ta3Ga tetrahedra,  a cornercorner with one Se(15)Ta3Ga tetrahedra,  an edgeedge with one Te(1)Ta3Ga tetrahedra,  an edgeedge with one Te(7)Ta3Ga tetrahedra, and  an edgeedge with one Se(14)Ta3Ga tetrahedra. In the fifth Te site, Te(5) is bonded to one Ta(1), one Ta(10), one Ta(4), and one Ga(2) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(6)Ta3Ga tetrahedra,  a cornercorner with one Se(13)Ta3Ga tetrahedra,  a cornercorner with one Se(16)Ta3Ga tetrahedra,  an edgeedge with one Te(2)Ta3Ga tetrahedra,  an edgeedge with one Te(8)Ta3Ga tetrahedra, and  an edgeedge with one Se(15)Ta3Ga tetrahedra. In the sixth Te site, Te(6) is bonded to one Ta(2), one Ta(5), one Ta(7), and one Ga(2) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(5)Ta3Ga tetrahedra,  a cornercorner with one Se(13)Ta3Ga tetrahedra,  a cornercorner with one Se(16)Ta3Ga tetrahedra,  an edgeedge with one Te(3)Ta3Ga tetrahedra,  an edgeedge with one Se(13)Ta3Ga tetrahedra, and  an edgeedge with one Se(16)Ta3Ga tetrahedra. In the seventh Te site, Te(7) is bonded to one Ta(3), one Ta(6), one Ta(8), and one Ga(3) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(1)Ta3Ga tetrahedra,  a cornercorner with one Te(3)Ta3Ga tetrahedra,  a cornercorner with one Se(14)Ta3Ga tetrahedra,  an edgeedge with one Te(1)Ta3Ga tetrahedra,  an edgeedge with one Te(4)Ta3Ga tetrahedra, and  an edgeedge with one Se(14)Ta3Ga tetrahedra. In the eighth Te site, Te(8) is bonded to one Ta(1), one Ta(4), one Ta(9), and one Ga(1) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(2)Ta3Ga tetrahedra,  a cornercorner with one Te(4)Ta3Ga tetrahedra,  a cornercorner with one Se(15)Ta3Ga tetrahedra,  an edgeedge with one Te(2)Ta3Ga tetrahedra,  an edgeedge with one Te(5)Ta3Ga tetrahedra, and  an edgeedge with one Se(15)Ta3Ga tetrahedra. There are sixteen inequivalent Se sites. In the first Se site, Se(1) is bonded in a 3-coordinate geometry to one Ta(10), one Ta(4), and one Ta(7) atom. In the second Se site, Se(2) is bonded in a 3-coordinate geometry to one Ta(11), one Ta(5), and one Ta(8) atom. In the third Se site, Se(3) is bonded in a 3-coordinate geometry to one Ta(12), one Ta(6), and one Ta(9) atom. In the fourth Se site, Se(4) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(10), and one Ta(7) atom. In the fifth Se site, Se(5) is bonded in a 3-coordinate geometry to one Ta(11), one Ta(2), and one Ta(8) atom. In the sixth Se site, Se(6) is bonded in a 3-coordinate geometry to one Ta(12), one Ta(3), and one Ta(9) atom. In the seventh Se site, Se(7) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(10), and one Ta(4) atom. In the eighth Se site, Se(8) is bonded in a 3-coordinate geometry to one Ta(11), one Ta(2), and one Ta(5) atom. In the ninth Se site, Se(9) is bonded in a 3-coordinate geometry to one Ta(12), one Ta(3), and one Ta(6) atom. In the tenth Se site, Se(10) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(4), and one Ta(7) atom. In the eleventh Se site, Se(11) is bonded in a 3-coordinate geometry to one Ta(2), one Ta(5), and one Ta(8) atom. In the twelfth Se site, Se(12) is bonded in a 3-coordinate geometry to one Ta(3), one Ta(6), and one Ta(9) atom. In the thirteenth Se site, Se(13) is bonded to one Ta(11), one Ta(5), one Ta(7), and one Ga(2) atom to form SeTa3Ga tetrahedra that share  a cornercorner with one Te(5)Ta3Ga tetrahedra,  a cornercorner with one Te(6)Ta3Ga tetrahedra,  a cornercorner with one Se(16)Ta3Ga tetrahedra,  an edgeedge with one Te(3)Ta3Ga tetrahedra,  an edgeedge with one Te(6)Ta3Ga tetrahedra, and  an edgeedge with one Se(16)Ta3Ga tetrahedra. In the fourteenth Se site, Se(14) is bonded to one Ta(12), one Ta(6), one Ta(8), and one Ga(3) atom to form SeTa3Ga tetrahedra that share  a cornercorner with one Te(1)Ta3Ga tetrahedra,  a cornercorner with one Te(3)Ta3Ga tetrahedra,  a cornercorner with one Te(7)Ta3Ga tetrahedra,  an edgeedge with one Te(1)Ta3Ga tetrahedra,  an edgeedge with one Te(4)Ta3Ga tetrahedra, and  an edgeedge with one Te(7)Ta3Ga tetrahedra. In the fifteenth Se site, Se(15) is bonded to one Ta(10), one Ta(4), one Ta(9), and one Ga(1) atom to form SeTa3Ga tetrahedra that share  a cornercorner with one Te(2)Ta3Ga tetrahedra,  a cornercorner with one Te(4)Ta3Ga tetrahedra,  a cornercorner with one Te(8)Ta3Ga tetrahedra,  an edgeedge with one Te(2)Ta3Ga tetrahedra,  an edgeedge with one Te(5)Ta3Ga tetrahedra, and  an edgeedge with one Te(8)Ta3Ga tetrahedra. In the sixteenth Se site, Se(16) is bonded to one Ta(11), one Ta(2), one Ta(7), and one Ga(2) atom to form SeTa3Ga tetrahedra that share  a cornercorner with one Te(5)Ta3Ga tetrahedra,  a cornercorner with one Te(6)Ta3Ga tetrahedra,  a cornercorner with one Se(13)Ta3Ga tetrahedra,  an edgeedge with one Te(3)Ta3Ga tetrahedra,  an edgeedge with one Te(6)Ta3Ga tetrahedra, and  an edgeedge with one Se(13)Ta3Ga tetrahedra. is represented by the CIF card [CIF]
data_Ta12Ga3(TeSe2)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.628
_cell_length_b   7.715
_cell_length_c   18.788
_cell_angle_alpha   90.623
_cell_angle_beta   89.991
_cell_angle_gamma   119.567
_symmetry_Int_Tables_number   1
_cell_volume   961.635
_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
  Ta  Ta0  1  0.209  0.798  0.197  1.0
  Ta  Ta1  1  0.544  0.471  0.867  1.0
  Ta  Ta2  1  0.874  0.131  0.532  1.0
  Ta  Ta3  1  0.593  0.806  0.198  1.0
  Ta  Ta4  1  0.926  0.472  0.866  1.0
  Ta  Ta5  1  0.259  0.139  0.533  1.0
  Ta  Ta6  1  0.340  0.681  0.066  1.0
  Ta  Ta7  1  0.669  0.345  0.737  1.0
  Ta  Ta8  1  0.001  0.012  0.401  1.0
  Ta  Ta9  1  0.191  0.397  0.203  1.0
  Ta  Ta10  1  0.528  0.059  0.872  1.0
  Ta  Ta11  1  0.857  0.729  0.537  1.0
  Ga  Ga12  1  0.681  0.328  0.330  1.0
  Ga  Ga13  1  0.990  0.984  0.994  1.0
  Ga  Ga14  1  0.349  0.662  0.664  1.0
  Te  Te15  1  0.972  0.483  0.622  1.0
  Te  Te16  1  0.305  0.149  0.287  1.0
  Te  Te17  1  0.334  0.664  0.803  1.0
  Te  Te18  1  0.666  0.330  0.469  1.0
  Te  Te19  1  0.998  0.996  0.134  1.0
  Te  Te20  1  0.180  0.361  0.954  1.0
  Te  Te21  1  0.516  0.031  0.622  1.0
  Te  Te22  1  0.850  0.697  0.287  1.0
  Se  Se23  1  0.498  0.491  0.124  1.0
  Se  Se24  1  0.832  0.156  0.792  1.0
  Se  Se25  1  0.163  0.823  0.458  1.0
  Se  Se26  1  0.986  0.489  0.120  1.0
  Se  Se27  1  0.319  0.155  0.793  1.0
  Se  Se28  1  0.648  0.820  0.456  1.0
  Se  Se29  1  0.333  0.664  0.299  1.0
  Se  Se30  1  0.666  0.331  0.967  1.0
  Se  Se31  1  0.999  0.998  0.633  1.0
  Se  Se32  1  0.516  0.031  0.121  1.0
  Se  Se33  1  0.848  0.699  0.789  1.0
  Se  Se34  1  0.180  0.363  0.455  1.0
  Se  Se35  1  0.181  0.814  0.954  1.0
  Se  Se36  1  0.518  0.480  0.621  1.0
  Se  Se37  1  0.851  0.148  0.287  1.0
  Se  Se38  1  0.632  0.813  0.954  1.0
[/CIF]
.
The material structure described by Ta12Ga3(TeSe2)8 crystallizes in the triclinic P1 space group. There are twelve inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 6-coordinate geometry to one Te(2), one Te(5), one Te(8), one Se(10), one Se(4), and one Se(7) atom. In the second Ta site, Ta(2) is bonded in a 6-coordinate geometry to one Te(3), one Te(6), one Se(11), one Se(16), one Se(5), and one Se(8) atom. In the third Ta site, Ta(3) is bonded in a 6-coordinate geometry to one Te(1), one Te(4), one Te(7), one Se(12), one Se(6), and one Se(9) atom. In the fourth Ta site, Ta(4) is bonded in a 6-coordinate geometry to one Te(5), one Te(8), one Se(1), one Se(10), one Se(15), and one Se(7) atom. In the fifth Ta site, Ta(5) is bonded in a 6-coordinate geometry to one Te(3), one Te(6), one Se(11), one Se(13), one Se(2), and one Se(8) atom. In the sixth Ta site, Ta(6) is bonded in a 6-coordinate geometry to one Te(4), one Te(7), one Se(12), one Se(14), one Se(3), and one Se(9) atom. In the seventh Ta site, Ta(7) is bonded in a 6-coordinate geometry to one Te(6), one Se(1), one Se(10), one Se(13), one Se(16), and one Se(4) atom. In the eighth Ta site, Ta(8) is bonded in a 6-coordinate geometry to one Te(1), one Te(7), one Se(11), one Se(14), one Se(2), and one Se(5) atom. In the ninth Ta site, Ta(9) is bonded in a 6-coordinate geometry to one Te(2), one Te(8), one Se(12), one Se(15), one Se(3), and one Se(6) atom. In the tenth Ta site, Ta(10) is bonded in a 6-coordinate geometry to one Te(2), one Te(5), one Se(1), one Se(15), one Se(4), and one Se(7) atom. In the eleventh Ta site, Ta(11) is bonded in a 6-coordinate geometry to one Te(3), one Se(13), one Se(16), one Se(2), one Se(5), and one Se(8) atom. In the twelfth Ta site, Ta(12) is bonded in a 6-coordinate geometry to one Te(1), one Te(4), one Se(14), one Se(3), one Se(6), and one Se(9) atom. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a tetrahedral geometry to one Te(2), one Te(4), one Te(8), and one Se(15) atom. In the second Ga site, Ga(2) is bonded in a tetrahedral geometry to one Te(5), one Te(6), one Se(13), and one Se(16) atom. In the third Ga site, Ga(3) is bonded in a tetrahedral geometry to one Te(1), one Te(3), one Te(7), and one Se(14) atom. There are eight inequivalent Te sites. In the first Te site, Te(1) is bonded to one Ta(12), one Ta(3), one Ta(8), and one Ga(3) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(3)Ta3Ga tetrahedra,  a cornercorner with one Te(7)Ta3Ga tetrahedra,  a cornercorner with one Se(14)Ta3Ga tetrahedra,  an edgeedge with one Te(4)Ta3Ga tetrahedra,  an edgeedge with one Te(7)Ta3Ga tetrahedra, and  an edgeedge with one Se(14)Ta3Ga tetrahedra. In the second Te site, Te(2) is bonded to one Ta(1), one Ta(10), one Ta(9), and one Ga(1) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(4)Ta3Ga tetrahedra,  a cornercorner with one Te(8)Ta3Ga tetrahedra,  a cornercorner with one Se(15)Ta3Ga tetrahedra,  an edgeedge with one Te(5)Ta3Ga tetrahedra,  an edgeedge with one Te(8)Ta3Ga tetrahedra, and  an edgeedge with one Se(15)Ta3Ga tetrahedra. In the third Te site, Te(3) is bonded to one Ta(11), one Ta(2), one Ta(5), and one Ga(3) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(1)Ta3Ga tetrahedra,  a cornercorner with one Te(7)Ta3Ga tetrahedra,  a cornercorner with one Se(14)Ta3Ga tetrahedra,  an edgeedge with one Te(6)Ta3Ga tetrahedra,  an edgeedge with one Se(13)Ta3Ga tetrahedra, and  an edgeedge with one Se(16)Ta3Ga tetrahedra. In the fourth Te site, Te(4) is bonded to one Ta(12), one Ta(3), one Ta(6), and one Ga(1) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(2)Ta3Ga tetrahedra,  a cornercorner with one Te(8)Ta3Ga tetrahedra,  a cornercorner with one Se(15)Ta3Ga tetrahedra,  an edgeedge with one Te(1)Ta3Ga tetrahedra,  an edgeedge with one Te(7)Ta3Ga tetrahedra, and  an edgeedge with one Se(14)Ta3Ga tetrahedra. In the fifth Te site, Te(5) is bonded to one Ta(1), one Ta(10), one Ta(4), and one Ga(2) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(6)Ta3Ga tetrahedra,  a cornercorner with one Se(13)Ta3Ga tetrahedra,  a cornercorner with one Se(16)Ta3Ga tetrahedra,  an edgeedge with one Te(2)Ta3Ga tetrahedra,  an edgeedge with one Te(8)Ta3Ga tetrahedra, and  an edgeedge with one Se(15)Ta3Ga tetrahedra. In the sixth Te site, Te(6) is bonded to one Ta(2), one Ta(5), one Ta(7), and one Ga(2) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(5)Ta3Ga tetrahedra,  a cornercorner with one Se(13)Ta3Ga tetrahedra,  a cornercorner with one Se(16)Ta3Ga tetrahedra,  an edgeedge with one Te(3)Ta3Ga tetrahedra,  an edgeedge with one Se(13)Ta3Ga tetrahedra, and  an edgeedge with one Se(16)Ta3Ga tetrahedra. In the seventh Te site, Te(7) is bonded to one Ta(3), one Ta(6), one Ta(8), and one Ga(3) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(1)Ta3Ga tetrahedra,  a cornercorner with one Te(3)Ta3Ga tetrahedra,  a cornercorner with one Se(14)Ta3Ga tetrahedra,  an edgeedge with one Te(1)Ta3Ga tetrahedra,  an edgeedge with one Te(4)Ta3Ga tetrahedra, and  an edgeedge with one Se(14)Ta3Ga tetrahedra. In the eighth Te site, Te(8) is bonded to one Ta(1), one Ta(4), one Ta(9), and one Ga(1) atom to form TeTa3Ga tetrahedra that share  a cornercorner with one Te(2)Ta3Ga tetrahedra,  a cornercorner with one Te(4)Ta3Ga tetrahedra,  a cornercorner with one Se(15)Ta3Ga tetrahedra,  an edgeedge with one Te(2)Ta3Ga tetrahedra,  an edgeedge with one Te(5)Ta3Ga tetrahedra, and  an edgeedge with one Se(15)Ta3Ga tetrahedra. There are sixteen inequivalent Se sites. In the first Se site, Se(1) is bonded in a 3-coordinate geometry to one Ta(10), one Ta(4), and one Ta(7) atom. In the second Se site, Se(2) is bonded in a 3-coordinate geometry to one Ta(11), one Ta(5), and one Ta(8) atom. In the third Se site, Se(3) is bonded in a 3-coordinate geometry to one Ta(12), one Ta(6), and one Ta(9) atom. In the fourth Se site, Se(4) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(10), and one Ta(7) atom. In the fifth Se site, Se(5) is bonded in a 3-coordinate geometry to one Ta(11), one Ta(2), and one Ta(8) atom. In the sixth Se site, Se(6) is bonded in a 3-coordinate geometry to one Ta(12), one Ta(3), and one Ta(9) atom. In the seventh Se site, Se(7) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(10), and one Ta(4) atom. In the eighth Se site, Se(8) is bonded in a 3-coordinate geometry to one Ta(11), one Ta(2), and one Ta(5) atom. In the ninth Se site, Se(9) is bonded in a 3-coordinate geometry to one Ta(12), one Ta(3), and one Ta(6) atom. In the tenth Se site, Se(10) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(4), and one Ta(7) atom. In the eleventh Se site, Se(11) is bonded in a 3-coordinate geometry to one Ta(2), one Ta(5), and one Ta(8) atom. In the twelfth Se site, Se(12) is bonded in a 3-coordinate geometry to one Ta(3), one Ta(6), and one Ta(9) atom. In the thirteenth Se site, Se(13) is bonded to one Ta(11), one Ta(5), one Ta(7), and one Ga(2) atom to form SeTa3Ga tetrahedra that share  a cornercorner with one Te(5)Ta3Ga tetrahedra,  a cornercorner with one Te(6)Ta3Ga tetrahedra,  a cornercorner with one Se(16)Ta3Ga tetrahedra,  an edgeedge with one Te(3)Ta3Ga tetrahedra,  an edgeedge with one Te(6)Ta3Ga tetrahedra, and  an edgeedge with one Se(16)Ta3Ga tetrahedra. In the fourteenth Se site, Se(14) is bonded to one Ta(12), one Ta(6), one Ta(8), and one Ga(3) atom to form SeTa3Ga tetrahedra that share  a cornercorner with one Te(1)Ta3Ga tetrahedra,  a cornercorner with one Te(3)Ta3Ga tetrahedra,  a cornercorner with one Te(7)Ta3Ga tetrahedra,  an edgeedge with one Te(1)Ta3Ga tetrahedra,  an edgeedge with one Te(4)Ta3Ga tetrahedra, and  an edgeedge with one Te(7)Ta3Ga tetrahedra. In the fifteenth Se site, Se(15) is bonded to one Ta(10), one Ta(4), one Ta(9), and one Ga(1) atom to form SeTa3Ga tetrahedra that share  a cornercorner with one Te(2)Ta3Ga tetrahedra,  a cornercorner with one Te(4)Ta3Ga tetrahedra,  a cornercorner with one Te(8)Ta3Ga tetrahedra,  an edgeedge with one Te(2)Ta3Ga tetrahedra,  an edgeedge with one Te(5)Ta3Ga tetrahedra, and  an edgeedge with one Te(8)Ta3Ga tetrahedra. In the sixteenth Se site, Se(16) is bonded to one Ta(11), one Ta(2), one Ta(7), and one Ga(2) atom to form SeTa3Ga tetrahedra that share  a cornercorner with one Te(5)Ta3Ga tetrahedra,  a cornercorner with one Te(6)Ta3Ga tetrahedra,  a cornercorner with one Se(13)Ta3Ga tetrahedra,  an edgeedge with one Te(3)Ta3Ga tetrahedra,  an edgeedge with one Te(6)Ta3Ga tetrahedra, and  an edgeedge with one Se(13)Ta3Ga tetrahedra. is represented by the CIF card [CIF]
data_Ta12Ga3(TeSe2)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.628
_cell_length_b   7.715
_cell_length_c   18.788
_cell_angle_alpha   90.623
_cell_angle_beta   89.991
_cell_angle_gamma   119.567
_symmetry_Int_Tables_number   1
_cell_volume   961.635
_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
  Ta  Ta0  1  0.209  0.798  0.197  1.0
  Ta  Ta1  1  0.544  0.471  0.867  1.0
  Ta  Ta2  1  0.874  0.131  0.532  1.0
  Ta  Ta3  1  0.593  0.806  0.198  1.0
  Ta  Ta4  1  0.926  0.472  0.866  1.0
  Ta  Ta5  1  0.259  0.139  0.533  1.0
  Ta  Ta6  1  0.340  0.681  0.066  1.0
  Ta  Ta7  1  0.669  0.345  0.737  1.0
  Ta  Ta8  1  0.001  0.012  0.401  1.0
  Ta  Ta9  1  0.191  0.397  0.203  1.0
  Ta  Ta10  1  0.528  0.059  0.872  1.0
  Ta  Ta11  1  0.857  0.729  0.537  1.0
  Ga  Ga12  1  0.681  0.328  0.330  1.0
  Ga  Ga13  1  0.990  0.984  0.994  1.0
  Ga  Ga14  1  0.349  0.662  0.664  1.0
  Te  Te15  1  0.972  0.483  0.622  1.0
  Te  Te16  1  0.305  0.149  0.287  1.0
  Te  Te17  1  0.334  0.664  0.803  1.0
  Te  Te18  1  0.666  0.330  0.469  1.0
  Te  Te19  1  0.998  0.996  0.134  1.0
  Te  Te20  1  0.180  0.361  0.954  1.0
  Te  Te21  1  0.516  0.031  0.622  1.0
  Te  Te22  1  0.850  0.697  0.287  1.0
  Se  Se23  1  0.498  0.491  0.124  1.0
  Se  Se24  1  0.832  0.156  0.792  1.0
  Se  Se25  1  0.163  0.823  0.458  1.0
  Se  Se26  1  0.986  0.489  0.120  1.0
  Se  Se27  1  0.319  0.155  0.793  1.0
  Se  Se28  1  0.648  0.820  0.456  1.0
  Se  Se29  1  0.333  0.664  0.299  1.0
  Se  Se30  1  0.666  0.331  0.967  1.0
  Se  Se31  1  0.999  0.998  0.633  1.0
  Se  Se32  1  0.516  0.031  0.121  1.0
  Se  Se33  1  0.848  0.699  0.789  1.0
  Se  Se34  1  0.180  0.363  0.455  1.0
  Se  Se35  1  0.181  0.814  0.954  1.0
  Se  Se36  1  0.518  0.480  0.621  1.0
  Se  Se37  1  0.851  0.148  0.287  1.0
  Se  Se38  1  0.632  0.813  0.954  1.0
[/CIF]
.