data_Mg2CrAg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.72
_cell_length_b   4.72
_cell_length_c   4.72
_cell_angle_alpha   122.25
_cell_angle_beta   122.25
_cell_angle_gamma   86.14
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Mg2CrAg
_chemical_formula_sum   'Mg2 Cr1 Ag1'
_cell_volume   71.86
_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
  Mg  Mg2  1  0.28  0.0  0.73  1.0
  Mg  Mg3  1  0.0  0.28  0.73  1.0
  Cr  Cr1  1  0.0  0.0  0.0  1.0
  Ag  Ag0  1  0.0  0.0  0.45  1.0

data_Mg2CrAg
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.45
_cell_length_b   6.45
_cell_length_c   4.72
_cell_angle_alpha   90.0
_cell_angle_beta   133.07
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Mg2CrAg
_chemical_formula_sum   'Mg4 Cr2 Ag2'
_cell_volume   143.73
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Mg  Mg0  4  0.36  0.36  0.44  1.0
  Cr  Cr1  2  0.0  0.0  0.0  1.0
  Ag  Ag2  2  0.0  0.0  0.45  1.0

Mg Mg Cr Ag
Mg2CrAg crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a single-bond geometry to two equivalent Cr(1) and one Ag(1) atom. There is one shorter (2.30 Å) and one longer (2.92 Å) Mg(1)-Cr(1) bond length. The Mg(1)-Ag(1) bond length is 1.27 Å. Cr(1) is bonded in a 5-coordinate geometry to four equivalent Mg(1) and one Ag(1) atom. The Cr(1)-Ag(1) bond length is 2.13 Å. Ag(1) is bonded in a distorted L-shaped geometry to two equivalent Mg(1) and one Cr(1) atom.