The material described by Mg2Ca is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the orthorhombic Cmcm space group. Ca(1) is bonded in a 12-coordinate geometry to two equivalent Ca(1) and ten equivalent Mg(1) atoms. Mg(1) is bonded in a 11-coordinate geometry to five equivalent Ca(1) and six equivalent Mg(1) atoms. is represented by the CIF card [CIF]
data_CaMg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.098
_cell_length_b   6.098
_cell_length_c   5.423
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   123.297
_symmetry_Int_Tables_number   1
_cell_volume   168.575
_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  0.704  0.704  0.750  1.0
  Ca  Ca1  1  0.296  0.296  0.250  1.0
  Mg  Mg2  1  0.981  0.350  0.750  1.0
  Mg  Mg3  1  0.350  0.981  0.750  1.0
  Mg  Mg4  1  0.650  0.019  0.250  1.0
  Mg  Mg5  1  0.019  0.650  0.250  1.0
[/CIF]
.
The material described by Mg2Ca is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the orthorhombic Cmcm space group. Ca(1) is bonded in a 12-coordinate geometry to two equivalent Ca(1) and ten equivalent Mg(1) atoms. Mg(1) is bonded in a 11-coordinate geometry to five equivalent Ca(1) and six equivalent Mg(1) atoms. is represented by the CIF card [CIF]
data_CaMg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.098
_cell_length_b   6.098
_cell_length_c   5.423
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   123.297
_symmetry_Int_Tables_number   1
_cell_volume   168.575
_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  0.704  0.704  0.750  1.0
  Ca  Ca1  1  0.296  0.296  0.250  1.0
  Mg  Mg2  1  0.981  0.350  0.750  1.0
  Mg  Mg3  1  0.350  0.981  0.750  1.0
  Mg  Mg4  1  0.650  0.019  0.250  1.0
  Mg  Mg5  1  0.019  0.650  0.250  1.0
[/CIF]
.