data_[Sr3Mg3Ag6Cl18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Mg  1.3100  1.5000  0.8600
  Ag  1.9300  1.6000  1.0867
  Cl  3.1600  1.0000  0.7800
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [6.9169]
_cell_length_b [6.9169]
_cell_length_c [18.7455]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [SrMg(AgCl3)2]
_chemical_formula_sum '[Sr3 Mg3 Ag6 Cl18]'
_cell_volume [776.7022]
_cell_formula_units_Z [3]
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
[
  Sr  Sr0  3  0.0000  0.0000  0.8185  1.0
  Mg  Mg1  3  0.0000  0.0000  0.3233  1.0
  Ag  Ag2  3  0.0000  0.0000  0.0176  1.0
  Ag  Ag3  3  0.0000  0.0000  0.5268  1.0
  Cl  Cl4  9  0.0313  0.3466  0.9172  1.0
  Cl  Cl5  9  0.0461  0.6713  0.0742  1.0
]