The crystal structure described by Ca28Ga11 crystallizes in the orthorhombic Imm2 space group. There are fifteen inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one Ga(2), one Ga(3), and two equivalent Ga(1) atoms to form a mixture of distorted edge and corner-sharing CaGa4 tetrahedra. In the second Ca site, Ca(2) is bonded in a trigonal planar geometry to one Ga(5) and two equivalent Ga(4) atoms. In the third Ca site, Ca(3) is bonded to one Ga(1) and three equivalent Ga(3) atoms to form a mixture of distorted edge and corner-sharing CaGa4 tetrahedra. In the fourth Ca site, Ca(4) is bonded to one Ga(1), one Ga(5), and two equivalent Ga(2) atoms to form a mixture of distorted edge and corner-sharing CaGa4 tetrahedra. In the fifth Ca site, Ca(5) is bonded in a distorted single-bond geometry to one Ga(1) and two equivalent Ga(2) atoms. In the sixth Ca site, Ca(6) is bonded in a distorted trigonal non-coplanar geometry to one Ga(2) and two equivalent Ga(1) atoms. In the seventh Ca site, Ca(7) is bonded to one Ga(5), one Ga(6), and two equivalent Ga(4) atoms to form a mixture of distorted edge and corner-sharing CaGa4 tetrahedra. In the eighth Ca site, Ca(8) is bonded to two equivalent Ga(4) and two equivalent Ga(6) atoms to form a mixture of distorted edge and corner-sharing CaGa4 tetrahedra. In the ninth Ca site, Ca(9) is bonded in a distorted trigonal planar geometry to one Ga(5) and two equivalent Ga(2) atoms. In the tenth Ca site, Ca(10) is bonded in a distorted trigonal non-coplanar geometry to one Ga(4) and two equivalent Ga(5) atoms. In the eleventh Ca site, Ca(11) is bonded in a trigonal planar geometry to three equivalent Ga(3) atoms. In the twelfth Ca site, Ca(12) is bonded in a distorted trigonal non-coplanar geometry to one Ga(2) and two equivalent Ga(5) atoms. In the thirteenth Ca site, Ca(13) is bonded in a distorted trigonal planar geometry to one Ga(3) and two equivalent Ga(1) atoms. In the fourteenth Ca site, Ca(14) is bonded in a single-bond geometry to one Ga(6) atom. In the fifteenth Ca site, Ca(15) is bonded in a distorted trigonal non-coplanar geometry to one Ga(4) and two equivalent Ga(6) atoms. There are six inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to one Ca(3), one Ca(4), one Ca(5), two equivalent Ca(1), two equivalent Ca(13), and two equivalent Ca(6) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to one Ca(1), one Ca(12), one Ca(6), two equivalent Ca(4), two equivalent Ca(5), and two equivalent Ca(9) atoms. In the third Ga site, Ga(3) is bonded in a distorted body-centered cubic geometry to one Ca(1), one Ca(13), three equivalent Ca(11), and three equivalent Ca(3) atoms. In the fourth Ga site, Ga(4) is bonded in a 7-coordinate geometry to one Ca(10), one Ca(15), one Ca(8), two equivalent Ca(2), and two equivalent Ca(7) atoms. In the fifth Ga site, Ga(5) is bonded in a body-centered cubic geometry to one Ca(2), one Ca(4), one Ca(7), one Ca(9), two equivalent Ca(10), and two equivalent Ca(12) atoms. In the sixth Ga site, Ga(6) is bonded in a 9-coordinate geometry to one Ca(14), two equivalent Ca(7), two equivalent Ca(8), and four equivalent Ca(15) atoms. is represented by the CIF file [CIF]
data_Ca28Ga11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.297
_cell_length_b   7.409
_cell_length_c   30.899
_cell_angle_alpha   96.886
_cell_angle_beta   94.918
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1199.580
_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
  Ca  Ca0  1  0.818  0.920  0.636  1.0
  Ca  Ca1  1  0.560  0.233  0.120  1.0
  Ca  Ca2  1  0.724  0.254  0.448  1.0
  Ca  Ca3  1  0.637  0.171  0.274  1.0
  Ca  Ca4  1  0.324  0.242  0.648  1.0
  Ca  Ca5  1  0.853  0.566  0.706  1.0
  Ca  Ca6  1  0.544  0.670  0.087  1.0
  Ca  Ca7  1  0.000  0.555  0.000  1.0
  Ca  Ca8  1  0.617  0.594  0.235  1.0
  Ca  Ca9  1  0.917  0.531  0.834  1.0
  Ca  Ca10  1  0.262  0.258  0.524  1.0
  Ca  Ca11  1  0.276  0.806  0.552  1.0
  Ca  Ca12  1  0.903  0.990  0.807  1.0
  Ca  Ca13  1  0.363  0.897  0.726  1.0
  Ca  Ca14  1  0.456  0.583  0.913  1.0
  Ca  Ca15  1  0.676  0.594  0.352  1.0
  Ca  Ca16  1  0.440  0.114  0.880  1.0
  Ca  Ca17  1  0.147  0.860  0.294  1.0
  Ca  Ca18  1  0.097  0.183  0.193  1.0
  Ca  Ca19  1  0.794  0.468  0.588  1.0
  Ca  Ca20  1  0.383  0.359  0.765  1.0
  Ca  Ca21  1  0.500  0.240  0.000  1.0
  Ca  Ca22  1  0.738  0.733  0.476  1.0
  Ca  Ca23  1  0.970  0.931  0.940  1.0
  Ca  Ca24  1  0.083  0.697  0.166  1.0
  Ca  Ca25  1  0.206  0.880  0.412  1.0
  Ca  Ca26  1  0.182  0.285  0.364  1.0
  Ca  Ca27  1  0.030  0.990  0.060  1.0
  Ga  Ga28  1  0.680  0.005  0.360  1.0
  Ga  Ga29  1  0.139  0.448  0.279  1.0
  Ga  Ga30  1  0.773  0.064  0.546  1.0
  Ga  Ga31  1  0.957  0.314  0.913  1.0
  Ga  Ga32  1  0.320  0.645  0.640  1.0
  Ga  Ga33  1  0.861  0.169  0.721  1.0
  Ga  Ga34  1  0.043  0.401  0.087  1.0
  Ga  Ga35  1  0.591  0.931  0.182  1.0
  Ga  Ga36  1  0.409  0.750  0.818  1.0
  Ga  Ga37  1  0.227  0.518  0.454  1.0
  Ga  Ga38  1  0.500  0.833  0.000  1.0
[/CIF]
.
The crystal structure described by Ca28Ga11 crystallizes in the orthorhombic Imm2 space group. There are fifteen inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one Ga(2), one Ga(3), and two equivalent Ga(1) atoms to form a mixture of distorted edge and corner-sharing CaGa4 tetrahedra. In the second Ca site, Ca(2) is bonded in a trigonal planar geometry to one Ga(5) and two equivalent Ga(4) atoms. In the third Ca site, Ca(3) is bonded to one Ga(1) and three equivalent Ga(3) atoms to form a mixture of distorted edge and corner-sharing CaGa4 tetrahedra. In the fourth Ca site, Ca(4) is bonded to one Ga(1), one Ga(5), and two equivalent Ga(2) atoms to form a mixture of distorted edge and corner-sharing CaGa4 tetrahedra. In the fifth Ca site, Ca(5) is bonded in a distorted single-bond geometry to one Ga(1) and two equivalent Ga(2) atoms. In the sixth Ca site, Ca(6) is bonded in a distorted trigonal non-coplanar geometry to one Ga(2) and two equivalent Ga(1) atoms. In the seventh Ca site, Ca(7) is bonded to one Ga(5), one Ga(6), and two equivalent Ga(4) atoms to form a mixture of distorted edge and corner-sharing CaGa4 tetrahedra. In the eighth Ca site, Ca(8) is bonded to two equivalent Ga(4) and two equivalent Ga(6) atoms to form a mixture of distorted edge and corner-sharing CaGa4 tetrahedra. In the ninth Ca site, Ca(9) is bonded in a distorted trigonal planar geometry to one Ga(5) and two equivalent Ga(2) atoms. In the tenth Ca site, Ca(10) is bonded in a distorted trigonal non-coplanar geometry to one Ga(4) and two equivalent Ga(5) atoms. In the eleventh Ca site, Ca(11) is bonded in a trigonal planar geometry to three equivalent Ga(3) atoms. In the twelfth Ca site, Ca(12) is bonded in a distorted trigonal non-coplanar geometry to one Ga(2) and two equivalent Ga(5) atoms. In the thirteenth Ca site, Ca(13) is bonded in a distorted trigonal planar geometry to one Ga(3) and two equivalent Ga(1) atoms. In the fourteenth Ca site, Ca(14) is bonded in a single-bond geometry to one Ga(6) atom. In the fifteenth Ca site, Ca(15) is bonded in a distorted trigonal non-coplanar geometry to one Ga(4) and two equivalent Ga(6) atoms. There are six inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to one Ca(3), one Ca(4), one Ca(5), two equivalent Ca(1), two equivalent Ca(13), and two equivalent Ca(6) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to one Ca(1), one Ca(12), one Ca(6), two equivalent Ca(4), two equivalent Ca(5), and two equivalent Ca(9) atoms. In the third Ga site, Ga(3) is bonded in a distorted body-centered cubic geometry to one Ca(1), one Ca(13), three equivalent Ca(11), and three equivalent Ca(3) atoms. In the fourth Ga site, Ga(4) is bonded in a 7-coordinate geometry to one Ca(10), one Ca(15), one Ca(8), two equivalent Ca(2), and two equivalent Ca(7) atoms. In the fifth Ga site, Ga(5) is bonded in a body-centered cubic geometry to one Ca(2), one Ca(4), one Ca(7), one Ca(9), two equivalent Ca(10), and two equivalent Ca(12) atoms. In the sixth Ga site, Ga(6) is bonded in a 9-coordinate geometry to one Ca(14), two equivalent Ca(7), two equivalent Ca(8), and four equivalent Ca(15) atoms. is represented by the CIF file [CIF]
data_Ca28Ga11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.297
_cell_length_b   7.409
_cell_length_c   30.899
_cell_angle_alpha   96.886
_cell_angle_beta   94.918
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1199.580
_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
  Ca  Ca0  1  0.818  0.920  0.636  1.0
  Ca  Ca1  1  0.560  0.233  0.120  1.0
  Ca  Ca2  1  0.724  0.254  0.448  1.0
  Ca  Ca3  1  0.637  0.171  0.274  1.0
  Ca  Ca4  1  0.324  0.242  0.648  1.0
  Ca  Ca5  1  0.853  0.566  0.706  1.0
  Ca  Ca6  1  0.544  0.670  0.087  1.0
  Ca  Ca7  1  0.000  0.555  0.000  1.0
  Ca  Ca8  1  0.617  0.594  0.235  1.0
  Ca  Ca9  1  0.917  0.531  0.834  1.0
  Ca  Ca10  1  0.262  0.258  0.524  1.0
  Ca  Ca11  1  0.276  0.806  0.552  1.0
  Ca  Ca12  1  0.903  0.990  0.807  1.0
  Ca  Ca13  1  0.363  0.897  0.726  1.0
  Ca  Ca14  1  0.456  0.583  0.913  1.0
  Ca  Ca15  1  0.676  0.594  0.352  1.0
  Ca  Ca16  1  0.440  0.114  0.880  1.0
  Ca  Ca17  1  0.147  0.860  0.294  1.0
  Ca  Ca18  1  0.097  0.183  0.193  1.0
  Ca  Ca19  1  0.794  0.468  0.588  1.0
  Ca  Ca20  1  0.383  0.359  0.765  1.0
  Ca  Ca21  1  0.500  0.240  0.000  1.0
  Ca  Ca22  1  0.738  0.733  0.476  1.0
  Ca  Ca23  1  0.970  0.931  0.940  1.0
  Ca  Ca24  1  0.083  0.697  0.166  1.0
  Ca  Ca25  1  0.206  0.880  0.412  1.0
  Ca  Ca26  1  0.182  0.285  0.364  1.0
  Ca  Ca27  1  0.030  0.990  0.060  1.0
  Ga  Ga28  1  0.680  0.005  0.360  1.0
  Ga  Ga29  1  0.139  0.448  0.279  1.0
  Ga  Ga30  1  0.773  0.064  0.546  1.0
  Ga  Ga31  1  0.957  0.314  0.913  1.0
  Ga  Ga32  1  0.320  0.645  0.640  1.0
  Ga  Ga33  1  0.861  0.169  0.721  1.0
  Ga  Ga34  1  0.043  0.401  0.087  1.0
  Ga  Ga35  1  0.591  0.931  0.182  1.0
  Ga  Ga36  1  0.409  0.750  0.818  1.0
  Ga  Ga37  1  0.227  0.518  0.454  1.0
  Ga  Ga38  1  0.500  0.833  0.000  1.0
[/CIF]
.