data_La2Si2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.95
_cell_length_b   3.95
_cell_length_c   7.34
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   La2Si2O5
_chemical_formula_sum   'La2 Si2 O5'
_cell_volume   114.39
_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
  La  La0  1  0.97  0.97  0.67  1.0
  La  La1  1  0.97  0.97  0.0  1.0
  Si  Si2  1  0.0  0.0  0.51  1.0
  Si  Si3  1  0.0  0.0  0.83  1.0
  O  O4  1  0.0  0.97  0.57  1.0
  O  O5  1  0.0  0.97  0.77  1.0
  O  O6  1  0.97  0.0  0.57  1.0
  O  O7  1  0.97  0.0  0.77  1.0
  O  O8  1  0.0  0.0  0.0  1.0

data_La2Si2O5
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.58
_cell_length_b   5.58
_cell_length_c   7.34
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   La2Si2O5
_chemical_formula_sum   'La4 Si4 O10'
_cell_volume   228.79
_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
  La  La0  2  0.47  0.5  0.0  1.0
  La  La1  2  0.47  0.5  0.67  1.0
  Si  Si2  2  0.0  0.0  0.51  1.0
  Si  Si3  2  0.0  0.0  0.83  1.0
  O  O4  4  0.49  0.49  0.57  1.0
  O  O5  4  0.49  0.49  0.77  1.0
  O  O6  2  0.0  0.0  0.0  1.0

La La Si Si O O O O O