The structure described by Ca(Al3Te5)2 crystallizes in the triclinic P1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one Te(10), one Te(11), one Te(12), one Te(16), one Te(18), one Te(4), and one Te(8) atom. In the second Ca site, Ca(2) is bonded in a 6-coordinate geometry to one Te(1), one Te(13), one Te(15), one Te(16), one Te(3), and one Te(9) atom. There are twelve inequivalent Al sites. In the first Al site, Al(1) is bonded to one Te(15), one Te(7), one Te(8), and one Te(9) atom to form corner-sharing AlTe4 tetrahedra. In the second Al site, Al(2) is bonded to one Te(10), one Te(2), one Te(5), and one Te(7) atom to form corner-sharing AlTe4 tetrahedra. In the third Al site, Al(3) is bonded to one Te(12), one Te(14), one Te(18), and one Te(20) atom to form AlTe4 tetrahedra that share  a cornercorner with one Al(7)AlTe3 tetrahedra,  a cornercorner with one Al(11)Te4 tetrahedra,  a cornercorner with one Al(6)Te4 trigonal pyramid, and  an edgeedge with one Al(4)Te4 tetrahedra. In the fourth Al site, Al(4) is bonded to one Te(13), one Te(14), one Te(19), and one Te(20) atom to form distorted AlTe4 tetrahedra that share  a cornercorner with one Al(6)Te4 trigonal pyramid,  an edgeedge with one Al(7)AlTe3 tetrahedra, and  an edgeedge with one Al(3)Te4 tetrahedra. In the fifth Al site, Al(5) is bonded in a 3-coordinate geometry to one Al(8), one Te(11), one Te(12), and one Te(17) atom. In the sixth Al site, Al(6) is bonded to one Te(15), one Te(17), one Te(2), and one Te(20) atom to form corner-sharing AlTe4 trigonal pyramids. In the seventh Al site, Al(7) is bonded to one Al(8), one Te(1), one Te(14), and one Te(19) atom to form a mixture of distorted corner and edge-sharing AlAlTe3 tetrahedra. In the eighth Al site, Al(8) is bonded in a 6-coordinate geometry to one Al(10), one Al(5), one Al(7), one Te(11), one Te(16), and one Te(18) atom. In the ninth Al site, Al(9) is bonded in a distorted rectangular see-saw-like geometry to one Te(16), one Te(17), one Te(2), and one Te(3) atom. In the tenth Al site, Al(10) is bonded in a distorted water-like geometry to one Al(8), one Te(19), and one Te(5) atom. In the eleventh Al site, Al(11) is bonded to one Te(16), one Te(18), one Te(2), and one Te(4) atom to form distorted corner-sharing AlTe4 tetrahedra. In the twelfth Al site, Al(12) is bonded to one Te(1), one Te(3), one Te(4), and one Te(9) atom to form AlTe4 tetrahedra that share  a cornercorner with one Al(7)AlTe3 tetrahedra,  a cornercorner with one Al(1)Te4 tetrahedra, and  a cornercorner with one Al(11)Te4 tetrahedra. There are twenty inequivalent Te sites. In the first Te site, Te(1) is bonded in a 4-coordinate geometry to one Ca(2), one Al(12), one Al(7), and one Te(6) atom. In the second Te site, Te(2) is bonded in a distorted tetrahedral geometry to one Al(11), one Al(2), one Al(6), and one Al(9) atom. In the third Te site, Te(3) is bonded in a 3-coordinate geometry to one Ca(2), one Al(12), and one Al(9) atom. In the fourth Te site, Te(4) is bonded in a distorted L-shaped geometry to one Ca(1), one Al(11), and one Al(12) atom. In the fifth Te site, Te(5) is bonded in a bent 120 degrees geometry to one Al(10) and one Al(2) atom. In the sixth Te site, Te(6) is bonded in an L-shaped geometry to one Te(1) and one Te(8) atom. In the seventh Te site, Te(7) is bonded in an L-shaped geometry to one Al(1) and one Al(2) atom. In the eighth Te site, Te(8) is bonded in a distorted water-like geometry to one Ca(1), one Al(1), and one Te(6) atom. In the ninth Te site, Te(9) is bonded in a distorted water-like geometry to one Ca(2), one Al(1), and one Al(12) atom. In the tenth Te site, Te(10) is bonded in a distorted bent 150 degrees geometry to one Ca(1) and one Al(2) atom. In the eleventh Te site, Te(11) is bonded in a distorted T-shaped geometry to one Ca(1), one Al(5), and one Al(8) atom. In the twelfth Te site, Te(12) is bonded in a 3-coordinate geometry to one Ca(1), one Al(3), and one Al(5) atom. In the thirteenth Te site, Te(13) is bonded in a water-like geometry to one Ca(2) and one Al(4) atom. In the fourteenth Te site, Te(14) is bonded in a distorted trigonal planar geometry to one Al(3), one Al(4), and one Al(7) atom. In the fifteenth Te site, Te(15) is bonded in a distorted T-shaped geometry to one Ca(2), one Al(1), and one Al(6) atom. In the sixteenth Te site, Te(16) is bonded in a distorted pentagonal planar geometry to one Ca(1), one Ca(2), one Al(11), one Al(8), and one Al(9) atom. In the seventeenth Te site, Te(17) is bonded in a distorted T-shaped geometry to one Al(5), one Al(6), and one Al(9) atom. In the eighteenth Te site, Te(18) is bonded in a 4-coordinate geometry to one Ca(1), one Al(11), one Al(3), and one Al(8) atom. In the nineteenth Te site, Te(19) is bonded in a 3-coordinate geometry to one Al(10), one Al(4), and one Al(7) atom. In the twentieth Te site, Te(20) is bonded in a distorted trigonal non-coplanar geometry to one Al(3), one Al(4), and one Al(6) atom. is represented by the CIF file [CIF]
data_Ca(Al3Te5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.870
_cell_length_b   10.798
_cell_length_c   11.632
_cell_angle_alpha   87.194
_cell_angle_beta   87.313
_cell_angle_gamma   89.294
_symmetry_Int_Tables_number   1
_cell_volume   1236.677
_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
  Ca  Ca0  1  0.555  0.890  0.829  1.0
  Ca  Ca1  1  0.820  0.410  0.057  1.0
  Al  Al2  1  0.438  0.220  0.042  1.0
  Al  Al3  1  0.266  0.963  0.220  1.0
  Al  Al4  1  0.800  0.127  0.567  1.0
  Al  Al5  1  0.826  0.388  0.414  1.0
  Al  Al6  1  0.704  0.827  0.503  1.0
  Al  Al7  1  0.806  0.037  0.213  1.0
  Al  Al8  1  0.945  0.504  0.666  1.0
  Al  Al9  1  0.839  0.722  0.686  1.0
  Al  Al10  1  0.911  0.710  0.153  1.0
  Al  Al11  1  0.974  0.750  0.472  1.0
  Al  Al12  1  0.013  0.831  0.895  1.0
  Al  Al13  1  0.231  0.551  0.940  1.0
  Te  Te14  1  0.070  0.384  0.841  1.0
  Te  Te15  1  0.031  0.936  0.100  1.0
  Te  Te16  1  0.095  0.532  0.146  1.0
  Te  Te17  1  0.223  0.740  0.788  1.0
  Te  Te18  1  0.189  0.885  0.434  1.0
  Te  Te19  1  0.245  0.238  0.709  1.0
  Te  Te20  1  0.311  0.197  0.241  1.0
  Te  Te21  1  0.319  0.070  0.897  1.0
  Te  Te22  1  0.471  0.448  0.954  1.0
  Te  Te23  1  0.420  0.842  0.080  1.0
  Te  Te24  1  0.581  0.673  0.651  1.0
  Te  Te25  1  0.566  0.032  0.536  1.0
  Te  Te26  1  0.666  0.485  0.270  1.0
  Te  Te27  1  0.732  0.350  0.637  1.0
  Te  Te28  1  0.702  0.146  0.031  1.0
  Te  Te29  1  0.793  0.688  0.949  1.0
  Te  Te30  1  0.704  0.811  0.274  1.0
  Te  Te31  1  0.863  0.964  0.747  1.0
  Te  Te32  1  0.058  0.510  0.454  1.0
  Te  Te33  1  0.943  0.161  0.370  1.0
[/CIF]
.
The structure described by Ca(Al3Te5)2 crystallizes in the triclinic P1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one Te(10), one Te(11), one Te(12), one Te(16), one Te(18), one Te(4), and one Te(8) atom. In the second Ca site, Ca(2) is bonded in a 6-coordinate geometry to one Te(1), one Te(13), one Te(15), one Te(16), one Te(3), and one Te(9) atom. There are twelve inequivalent Al sites. In the first Al site, Al(1) is bonded to one Te(15), one Te(7), one Te(8), and one Te(9) atom to form corner-sharing AlTe4 tetrahedra. In the second Al site, Al(2) is bonded to one Te(10), one Te(2), one Te(5), and one Te(7) atom to form corner-sharing AlTe4 tetrahedra. In the third Al site, Al(3) is bonded to one Te(12), one Te(14), one Te(18), and one Te(20) atom to form AlTe4 tetrahedra that share  a cornercorner with one Al(7)AlTe3 tetrahedra,  a cornercorner with one Al(11)Te4 tetrahedra,  a cornercorner with one Al(6)Te4 trigonal pyramid, and  an edgeedge with one Al(4)Te4 tetrahedra. In the fourth Al site, Al(4) is bonded to one Te(13), one Te(14), one Te(19), and one Te(20) atom to form distorted AlTe4 tetrahedra that share  a cornercorner with one Al(6)Te4 trigonal pyramid,  an edgeedge with one Al(7)AlTe3 tetrahedra, and  an edgeedge with one Al(3)Te4 tetrahedra. In the fifth Al site, Al(5) is bonded in a 3-coordinate geometry to one Al(8), one Te(11), one Te(12), and one Te(17) atom. In the sixth Al site, Al(6) is bonded to one Te(15), one Te(17), one Te(2), and one Te(20) atom to form corner-sharing AlTe4 trigonal pyramids. In the seventh Al site, Al(7) is bonded to one Al(8), one Te(1), one Te(14), and one Te(19) atom to form a mixture of distorted corner and edge-sharing AlAlTe3 tetrahedra. In the eighth Al site, Al(8) is bonded in a 6-coordinate geometry to one Al(10), one Al(5), one Al(7), one Te(11), one Te(16), and one Te(18) atom. In the ninth Al site, Al(9) is bonded in a distorted rectangular see-saw-like geometry to one Te(16), one Te(17), one Te(2), and one Te(3) atom. In the tenth Al site, Al(10) is bonded in a distorted water-like geometry to one Al(8), one Te(19), and one Te(5) atom. In the eleventh Al site, Al(11) is bonded to one Te(16), one Te(18), one Te(2), and one Te(4) atom to form distorted corner-sharing AlTe4 tetrahedra. In the twelfth Al site, Al(12) is bonded to one Te(1), one Te(3), one Te(4), and one Te(9) atom to form AlTe4 tetrahedra that share  a cornercorner with one Al(7)AlTe3 tetrahedra,  a cornercorner with one Al(1)Te4 tetrahedra, and  a cornercorner with one Al(11)Te4 tetrahedra. There are twenty inequivalent Te sites. In the first Te site, Te(1) is bonded in a 4-coordinate geometry to one Ca(2), one Al(12), one Al(7), and one Te(6) atom. In the second Te site, Te(2) is bonded in a distorted tetrahedral geometry to one Al(11), one Al(2), one Al(6), and one Al(9) atom. In the third Te site, Te(3) is bonded in a 3-coordinate geometry to one Ca(2), one Al(12), and one Al(9) atom. In the fourth Te site, Te(4) is bonded in a distorted L-shaped geometry to one Ca(1), one Al(11), and one Al(12) atom. In the fifth Te site, Te(5) is bonded in a bent 120 degrees geometry to one Al(10) and one Al(2) atom. In the sixth Te site, Te(6) is bonded in an L-shaped geometry to one Te(1) and one Te(8) atom. In the seventh Te site, Te(7) is bonded in an L-shaped geometry to one Al(1) and one Al(2) atom. In the eighth Te site, Te(8) is bonded in a distorted water-like geometry to one Ca(1), one Al(1), and one Te(6) atom. In the ninth Te site, Te(9) is bonded in a distorted water-like geometry to one Ca(2), one Al(1), and one Al(12) atom. In the tenth Te site, Te(10) is bonded in a distorted bent 150 degrees geometry to one Ca(1) and one Al(2) atom. In the eleventh Te site, Te(11) is bonded in a distorted T-shaped geometry to one Ca(1), one Al(5), and one Al(8) atom. In the twelfth Te site, Te(12) is bonded in a 3-coordinate geometry to one Ca(1), one Al(3), and one Al(5) atom. In the thirteenth Te site, Te(13) is bonded in a water-like geometry to one Ca(2) and one Al(4) atom. In the fourteenth Te site, Te(14) is bonded in a distorted trigonal planar geometry to one Al(3), one Al(4), and one Al(7) atom. In the fifteenth Te site, Te(15) is bonded in a distorted T-shaped geometry to one Ca(2), one Al(1), and one Al(6) atom. In the sixteenth Te site, Te(16) is bonded in a distorted pentagonal planar geometry to one Ca(1), one Ca(2), one Al(11), one Al(8), and one Al(9) atom. In the seventeenth Te site, Te(17) is bonded in a distorted T-shaped geometry to one Al(5), one Al(6), and one Al(9) atom. In the eighteenth Te site, Te(18) is bonded in a 4-coordinate geometry to one Ca(1), one Al(11), one Al(3), and one Al(8) atom. In the nineteenth Te site, Te(19) is bonded in a 3-coordinate geometry to one Al(10), one Al(4), and one Al(7) atom. In the twentieth Te site, Te(20) is bonded in a distorted trigonal non-coplanar geometry to one Al(3), one Al(4), and one Al(6) atom. is represented by the CIF file [CIF]
data_Ca(Al3Te5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.870
_cell_length_b   10.798
_cell_length_c   11.632
_cell_angle_alpha   87.194
_cell_angle_beta   87.313
_cell_angle_gamma   89.294
_symmetry_Int_Tables_number   1
_cell_volume   1236.677
_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
  Ca  Ca0  1  0.555  0.890  0.829  1.0
  Ca  Ca1  1  0.820  0.410  0.057  1.0
  Al  Al2  1  0.438  0.220  0.042  1.0
  Al  Al3  1  0.266  0.963  0.220  1.0
  Al  Al4  1  0.800  0.127  0.567  1.0
  Al  Al5  1  0.826  0.388  0.414  1.0
  Al  Al6  1  0.704  0.827  0.503  1.0
  Al  Al7  1  0.806  0.037  0.213  1.0
  Al  Al8  1  0.945  0.504  0.666  1.0
  Al  Al9  1  0.839  0.722  0.686  1.0
  Al  Al10  1  0.911  0.710  0.153  1.0
  Al  Al11  1  0.974  0.750  0.472  1.0
  Al  Al12  1  0.013  0.831  0.895  1.0
  Al  Al13  1  0.231  0.551  0.940  1.0
  Te  Te14  1  0.070  0.384  0.841  1.0
  Te  Te15  1  0.031  0.936  0.100  1.0
  Te  Te16  1  0.095  0.532  0.146  1.0
  Te  Te17  1  0.223  0.740  0.788  1.0
  Te  Te18  1  0.189  0.885  0.434  1.0
  Te  Te19  1  0.245  0.238  0.709  1.0
  Te  Te20  1  0.311  0.197  0.241  1.0
  Te  Te21  1  0.319  0.070  0.897  1.0
  Te  Te22  1  0.471  0.448  0.954  1.0
  Te  Te23  1  0.420  0.842  0.080  1.0
  Te  Te24  1  0.581  0.673  0.651  1.0
  Te  Te25  1  0.566  0.032  0.536  1.0
  Te  Te26  1  0.666  0.485  0.270  1.0
  Te  Te27  1  0.732  0.350  0.637  1.0
  Te  Te28  1  0.702  0.146  0.031  1.0
  Te  Te29  1  0.793  0.688  0.949  1.0
  Te  Te30  1  0.704  0.811  0.274  1.0
  Te  Te31  1  0.863  0.964  0.747  1.0
  Te  Te32  1  0.058  0.510  0.454  1.0
  Te  Te33  1  0.943  0.161  0.370  1.0
[/CIF]
.