The compound described by Cu6As4S9 crystallizes in the triclinic P1 space group. There are twelve inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one S(15), one S(16), one S(2), and one S(9) atom to form corner-sharing CuS4 tetrahedra. In the second Cu site, Cu(2) is bonded to one S(1), one S(10), one S(11), and one S(13) atom to form corner-sharing CuS4 tetrahedra. In the third Cu site, Cu(3) is bonded to one S(10), one S(18), one S(4), and one S(8) atom to form corner-sharing CuS4 tetrahedra. In the fourth Cu site, Cu(4) is bonded to one S(16), one S(17), one S(4), and one S(5) atom to form corner-sharing CuS4 tetrahedra. In the fifth Cu site, Cu(5) is bonded to one S(1), one S(14), one S(16), and one S(7) atom to form corner-sharing CuS4 tetrahedra. In the sixth Cu site, Cu(6) is bonded to one S(2), one S(3), one S(5), and one S(8) atom to form corner-sharing CuS4 tetrahedra. In the seventh Cu site, Cu(7) is bonded to one S(11), one S(12), one S(18), and one S(5) atom to form corner-sharing CuS4 tetrahedra. In the eighth Cu site, Cu(8) is bonded to one S(11), one S(15), one S(6), and one S(8) atom to form corner-sharing CuS4 tetrahedra. In the ninth Cu site, Cu(9) is bonded to one S(12), one S(13), one S(6), and one S(9) atom to form corner-sharing CuS4 tetrahedra. In the tenth Cu site, Cu(10) is bonded to one S(10), one S(12), one S(3), and one S(7) atom to form corner-sharing CuS4 tetrahedra. In the eleventh Cu site, Cu(11) is bonded to one S(14), one S(17), one S(2), and one S(6) atom to form corner-sharing CuS4 tetrahedra. In the twelfth Cu site, Cu(12) is bonded to one S(1), one S(15), one S(3), and one S(4) atom to form corner-sharing CuS4 tetrahedra. There are eight inequivalent As sites. In the first As site, As(1) is bonded in a trigonal non-coplanar geometry to one S(11), one S(17), and one S(3) atom. In the second As site, As(2) is bonded in a trigonal non-coplanar geometry to one S(12), one S(14), and one S(4) atom. In the third As site, As(3) is bonded in a trigonal non-coplanar geometry to one S(13), one S(2), and one S(7) atom. In the fourth As site, As(4) is bonded in a trigonal non-coplanar geometry to one S(1), one S(18), and one S(9) atom. In the fifth As site, As(5) is bonded in a trigonal non-coplanar geometry to one S(10), one S(14), and one S(9) atom. In the sixth As site, As(6) is bonded in a trigonal non-coplanar geometry to one S(13), one S(16), and one S(8) atom. In the seventh As site, As(7) is bonded in a trigonal non-coplanar geometry to one S(15), one S(17), and one S(18) atom. In the eighth As site, As(8) is bonded in a trigonal non-coplanar geometry to one S(5), one S(6), and one S(7) atom. There are eighteen inequivalent S sites. In the first S site, S(1) is bonded to one Cu(12), one Cu(2), one Cu(5), and one As(4) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra, and  a cornercorner with one S(4)Cu3As tetrahedra. In the second S site, S(2) is bonded to one Cu(1), one Cu(11), one Cu(6), and one As(3) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra,  a cornercorner with one S(6)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the third S site, S(3) is bonded to one Cu(10), one Cu(12), one Cu(6), and one As(1) atom to form SCu3As tetrahedra that share  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the fourth S site, S(4) is bonded to one Cu(12), one Cu(3), one Cu(4), and one As(2) atom to form SCu3As tetrahedra that share  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the fifth S site, S(5) is bonded to one Cu(4), one Cu(6), one Cu(7), and one As(8) atom to form SCu3As tetrahedra that share  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(6)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the sixth S site, S(6) is bonded to one Cu(11), one Cu(8), one Cu(9), and one As(8) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the seventh S site, S(7) is bonded to one Cu(10), one Cu(5), one As(3), and one As(8) atom to form SCu2As2 tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(6)Cu3As tetrahedra. In the eighth S site, S(8) is bonded to one Cu(3), one Cu(6), one Cu(8), and one As(6) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(6)Cu3As tetrahedra. In the ninth S site, S(9) is bonded to one Cu(1), one Cu(9), one As(4), and one As(5) atom to form SCu2As2 tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra, and  a cornercorner with one S(6)Cu3As tetrahedra. In the tenth S site, S(10) is bonded to one Cu(10), one Cu(2), one Cu(3), and one As(5) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the eleventh S site, S(11) is bonded to one Cu(2), one Cu(7), one Cu(8), and one As(1) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra,  a cornercorner with one S(6)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the twelfth S site, S(12) is bonded to one Cu(10), one Cu(7), one Cu(9), and one As(2) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(6)Cu3As tetrahedra. In the thirteenth S site, S(13) is bonded to one Cu(2), one Cu(9), one As(3), and one As(6) atom to form SCu2As2 tetrahedra that share  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(6)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the fourteenth S site, S(14) is bonded to one Cu(11), one Cu(5), one As(2), and one As(5) atom to form SCu2As2 tetrahedra that share  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra, and  a cornercorner with one S(6)Cu3As tetrahedra. In the fifteenth S site, S(15) is bonded to one Cu(1), one Cu(12), one Cu(8), and one As(7) atom to form SCu3As tetrahedra that share  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(6)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the sixteenth S site, S(16) is bonded to one Cu(1), one Cu(4), one Cu(5), and one As(6) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the seventeenth S site, S(17) is bonded to one Cu(11), one Cu(4), one As(1), and one As(7) atom to form SCu2As2 tetrahedra that share  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(6)Cu3As tetrahedra. In the eighteenth S site, S(18) is bonded to one Cu(3), one Cu(7), one As(4), and one As(7) atom to form SCu2As2 tetrahedra that share  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. is represented by the CIF file [CIF]
data_Cu6As4S9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.061
_cell_length_b   9.074
_cell_length_c   9.825
_cell_angle_alpha   107.752
_cell_angle_beta   90.105
_cell_angle_gamma   109.427
_symmetry_Int_Tables_number   1
_cell_volume   720.757
_cell_formula_units_Z   2
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
  Cu  Cu0  1  0.512  0.605  0.987  1.0
  Cu  Cu1  1  0.203  0.721  0.602  1.0
  Cu  Cu2  1  0.332  0.034  0.389  1.0
  Cu  Cu3  1  0.657  0.073  0.194  1.0
  Cu  Cu4  1  0.610  0.913  0.797  1.0
  Cu  Cu5  1  0.939  0.835  0.192  1.0
  Cu  Cu6  1  0.058  0.278  0.397  1.0
  Cu  Cu7  1  0.171  0.559  0.184  1.0
  Cu  Cu8  1  0.107  0.410  0.794  1.0
  Cu  Cu9  1  0.964  0.965  0.603  1.0
  Cu  Cu10  1  0.757  0.366  0.988  1.0
  Cu  Cu11  1  0.582  0.761  0.408  1.0
  As  As12  1  0.823  0.539  0.420  1.0
  As  As13  1  0.717  0.234  0.575  1.0
  As  As14  1  0.853  0.655  0.793  1.0
  As  As15  1  0.498  0.483  0.589  1.0
  As  As16  1  0.354  0.155  0.795  1.0
  As  As17  1  0.276  0.902  0.010  1.0
  As  As18  1  0.410  0.319  0.180  1.0
  As  As19  1  0.043  0.130  0.012  1.0
  S  S20  1  0.454  0.711  0.597  1.0
  S  S21  1  0.773  0.628  0.999  1.0
  S  S22  1  0.835  0.776  0.388  1.0
  S  S23  1  0.575  0.008  0.397  1.0
  S  S24  1  0.911  0.075  0.194  1.0
  S  S25  1  0.005  0.357  0.994  1.0
  S  S26  1  0.865  0.922  0.805  1.0
  S  S27  1  0.183  0.818  0.195  1.0
  S  S28  1  0.360  0.415  0.783  1.0
  S  S29  1  0.222  0.975  0.588  1.0
  S  S30  1  0.065  0.531  0.391  1.0
  S  S31  1  0.956  0.210  0.592  1.0
  S  S32  1  0.119  0.670  0.807  1.0
  S  S33  1  0.616  0.161  0.784  1.0
  S  S34  1  0.426  0.573  0.199  1.0
  S  S35  1  0.509  0.861  0.998  1.0
  S  S36  1  0.669  0.329  0.196  1.0
  S  S37  1  0.312  0.280  0.400  1.0
[/CIF]
.
The compound described by Cu6As4S9 crystallizes in the triclinic P1 space group. There are twelve inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one S(15), one S(16), one S(2), and one S(9) atom to form corner-sharing CuS4 tetrahedra. In the second Cu site, Cu(2) is bonded to one S(1), one S(10), one S(11), and one S(13) atom to form corner-sharing CuS4 tetrahedra. In the third Cu site, Cu(3) is bonded to one S(10), one S(18), one S(4), and one S(8) atom to form corner-sharing CuS4 tetrahedra. In the fourth Cu site, Cu(4) is bonded to one S(16), one S(17), one S(4), and one S(5) atom to form corner-sharing CuS4 tetrahedra. In the fifth Cu site, Cu(5) is bonded to one S(1), one S(14), one S(16), and one S(7) atom to form corner-sharing CuS4 tetrahedra. In the sixth Cu site, Cu(6) is bonded to one S(2), one S(3), one S(5), and one S(8) atom to form corner-sharing CuS4 tetrahedra. In the seventh Cu site, Cu(7) is bonded to one S(11), one S(12), one S(18), and one S(5) atom to form corner-sharing CuS4 tetrahedra. In the eighth Cu site, Cu(8) is bonded to one S(11), one S(15), one S(6), and one S(8) atom to form corner-sharing CuS4 tetrahedra. In the ninth Cu site, Cu(9) is bonded to one S(12), one S(13), one S(6), and one S(9) atom to form corner-sharing CuS4 tetrahedra. In the tenth Cu site, Cu(10) is bonded to one S(10), one S(12), one S(3), and one S(7) atom to form corner-sharing CuS4 tetrahedra. In the eleventh Cu site, Cu(11) is bonded to one S(14), one S(17), one S(2), and one S(6) atom to form corner-sharing CuS4 tetrahedra. In the twelfth Cu site, Cu(12) is bonded to one S(1), one S(15), one S(3), and one S(4) atom to form corner-sharing CuS4 tetrahedra. There are eight inequivalent As sites. In the first As site, As(1) is bonded in a trigonal non-coplanar geometry to one S(11), one S(17), and one S(3) atom. In the second As site, As(2) is bonded in a trigonal non-coplanar geometry to one S(12), one S(14), and one S(4) atom. In the third As site, As(3) is bonded in a trigonal non-coplanar geometry to one S(13), one S(2), and one S(7) atom. In the fourth As site, As(4) is bonded in a trigonal non-coplanar geometry to one S(1), one S(18), and one S(9) atom. In the fifth As site, As(5) is bonded in a trigonal non-coplanar geometry to one S(10), one S(14), and one S(9) atom. In the sixth As site, As(6) is bonded in a trigonal non-coplanar geometry to one S(13), one S(16), and one S(8) atom. In the seventh As site, As(7) is bonded in a trigonal non-coplanar geometry to one S(15), one S(17), and one S(18) atom. In the eighth As site, As(8) is bonded in a trigonal non-coplanar geometry to one S(5), one S(6), and one S(7) atom. There are eighteen inequivalent S sites. In the first S site, S(1) is bonded to one Cu(12), one Cu(2), one Cu(5), and one As(4) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra, and  a cornercorner with one S(4)Cu3As tetrahedra. In the second S site, S(2) is bonded to one Cu(1), one Cu(11), one Cu(6), and one As(3) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra,  a cornercorner with one S(6)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the third S site, S(3) is bonded to one Cu(10), one Cu(12), one Cu(6), and one As(1) atom to form SCu3As tetrahedra that share  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the fourth S site, S(4) is bonded to one Cu(12), one Cu(3), one Cu(4), and one As(2) atom to form SCu3As tetrahedra that share  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the fifth S site, S(5) is bonded to one Cu(4), one Cu(6), one Cu(7), and one As(8) atom to form SCu3As tetrahedra that share  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(6)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the sixth S site, S(6) is bonded to one Cu(11), one Cu(8), one Cu(9), and one As(8) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the seventh S site, S(7) is bonded to one Cu(10), one Cu(5), one As(3), and one As(8) atom to form SCu2As2 tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(6)Cu3As tetrahedra. In the eighth S site, S(8) is bonded to one Cu(3), one Cu(6), one Cu(8), and one As(6) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(6)Cu3As tetrahedra. In the ninth S site, S(9) is bonded to one Cu(1), one Cu(9), one As(4), and one As(5) atom to form SCu2As2 tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra, and  a cornercorner with one S(6)Cu3As tetrahedra. In the tenth S site, S(10) is bonded to one Cu(10), one Cu(2), one Cu(3), and one As(5) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the eleventh S site, S(11) is bonded to one Cu(2), one Cu(7), one Cu(8), and one As(1) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra,  a cornercorner with one S(6)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the twelfth S site, S(12) is bonded to one Cu(10), one Cu(7), one Cu(9), and one As(2) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(6)Cu3As tetrahedra. In the thirteenth S site, S(13) is bonded to one Cu(2), one Cu(9), one As(3), and one As(6) atom to form SCu2As2 tetrahedra that share  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(6)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the fourteenth S site, S(14) is bonded to one Cu(11), one Cu(5), one As(2), and one As(5) atom to form SCu2As2 tetrahedra that share  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra, and  a cornercorner with one S(6)Cu3As tetrahedra. In the fifteenth S site, S(15) is bonded to one Cu(1), one Cu(12), one Cu(8), and one As(7) atom to form SCu3As tetrahedra that share  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(6)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the sixteenth S site, S(16) is bonded to one Cu(1), one Cu(4), one Cu(5), and one As(6) atom to form SCu3As tetrahedra that share  a cornercorner with one S(13)Cu2As2 tetrahedra,  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(7)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. In the seventeenth S site, S(17) is bonded to one Cu(11), one Cu(4), one As(1), and one As(7) atom to form SCu2As2 tetrahedra that share  a cornercorner with one S(14)Cu2As2 tetrahedra,  a cornercorner with one S(18)Cu2As2 tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(16)Cu3As tetrahedra,  a cornercorner with one S(2)Cu3As tetrahedra,  a cornercorner with one S(3)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(6)Cu3As tetrahedra. In the eighteenth S site, S(18) is bonded to one Cu(3), one Cu(7), one As(4), and one As(7) atom to form SCu2As2 tetrahedra that share  a cornercorner with one S(17)Cu2As2 tetrahedra,  a cornercorner with one S(9)Cu2As2 tetrahedra,  a cornercorner with one S(1)Cu3As tetrahedra,  a cornercorner with one S(10)Cu3As tetrahedra,  a cornercorner with one S(11)Cu3As tetrahedra,  a cornercorner with one S(12)Cu3As tetrahedra,  a cornercorner with one S(15)Cu3As tetrahedra,  a cornercorner with one S(4)Cu3As tetrahedra,  a cornercorner with one S(5)Cu3As tetrahedra, and  a cornercorner with one S(8)Cu3As tetrahedra. is represented by the CIF file [CIF]
data_Cu6As4S9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.061
_cell_length_b   9.074
_cell_length_c   9.825
_cell_angle_alpha   107.752
_cell_angle_beta   90.105
_cell_angle_gamma   109.427
_symmetry_Int_Tables_number   1
_cell_volume   720.757
_cell_formula_units_Z   2
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
  Cu  Cu0  1  0.512  0.605  0.987  1.0
  Cu  Cu1  1  0.203  0.721  0.602  1.0
  Cu  Cu2  1  0.332  0.034  0.389  1.0
  Cu  Cu3  1  0.657  0.073  0.194  1.0
  Cu  Cu4  1  0.610  0.913  0.797  1.0
  Cu  Cu5  1  0.939  0.835  0.192  1.0
  Cu  Cu6  1  0.058  0.278  0.397  1.0
  Cu  Cu7  1  0.171  0.559  0.184  1.0
  Cu  Cu8  1  0.107  0.410  0.794  1.0
  Cu  Cu9  1  0.964  0.965  0.603  1.0
  Cu  Cu10  1  0.757  0.366  0.988  1.0
  Cu  Cu11  1  0.582  0.761  0.408  1.0
  As  As12  1  0.823  0.539  0.420  1.0
  As  As13  1  0.717  0.234  0.575  1.0
  As  As14  1  0.853  0.655  0.793  1.0
  As  As15  1  0.498  0.483  0.589  1.0
  As  As16  1  0.354  0.155  0.795  1.0
  As  As17  1  0.276  0.902  0.010  1.0
  As  As18  1  0.410  0.319  0.180  1.0
  As  As19  1  0.043  0.130  0.012  1.0
  S  S20  1  0.454  0.711  0.597  1.0
  S  S21  1  0.773  0.628  0.999  1.0
  S  S22  1  0.835  0.776  0.388  1.0
  S  S23  1  0.575  0.008  0.397  1.0
  S  S24  1  0.911  0.075  0.194  1.0
  S  S25  1  0.005  0.357  0.994  1.0
  S  S26  1  0.865  0.922  0.805  1.0
  S  S27  1  0.183  0.818  0.195  1.0
  S  S28  1  0.360  0.415  0.783  1.0
  S  S29  1  0.222  0.975  0.588  1.0
  S  S30  1  0.065  0.531  0.391  1.0
  S  S31  1  0.956  0.210  0.592  1.0
  S  S32  1  0.119  0.670  0.807  1.0
  S  S33  1  0.616  0.161  0.784  1.0
  S  S34  1  0.426  0.573  0.199  1.0
  S  S35  1  0.509  0.861  0.998  1.0
  S  S36  1  0.669  0.329  0.196  1.0
  S  S37  1  0.312  0.280  0.400  1.0
[/CIF]
.