data_MgSi2W
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.27
_cell_length_b   8.27
_cell_length_c   8.27
_cell_angle_alpha   21.47
_cell_angle_beta   21.47
_cell_angle_gamma   21.47
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgSi2W
_chemical_formula_sum   'Mg1 Si2 W1'
_cell_volume   66.42
_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  Mg0  1  0.0  0.0  0.0  1.0
  Si  Si1  1  0.0  0.0  0.36  1.0
  Si  Si2  1  0.0  0.0  0.87  1.0
  W  W3  1  0.0  0.0  0.12  1.0

data_MgSi2W
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.34
_cell_length_b   3.08
_cell_length_c   8.27
_cell_angle_alpha   90.0
_cell_angle_beta   102.42
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   MgSi2W
_chemical_formula_sum   'Mg2 Si4 W2'
_cell_volume   132.84
_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  2  0.0  0.0  0.0  1.0
  Si  Si1  2  0.0  0.0  0.13  1.0
  Si  Si2  2  0.0  0.0  0.64  1.0
  W  W3  2  0.0  0.0  0.88  1.0

Mg Si Si W