data_global
_amcsd_formula_title 'SO3'
loop_
_publ_author_name
'Westrik R'
'MacGillavry C H'
_journal_name_full 'Acta Crystallographica'
_journal_volume 7 
_journal_year 1954
_journal_page_first 764
_journal_page_last 767
_publ_section_title
;
 The crystal structure of the asbestos-like form of sulphur trioxide
;
_database_code_amcsd 0009159
_chemical_formula_sum 'S O3'
_cell_length_a 6.20
_cell_length_b 4.06
_cell_length_c 9.31
_cell_angle_alpha 90
_cell_angle_beta 109.83
_cell_angle_gamma 90
_cell_volume 220.455
_exptl_crystal_density_diffrn      2.412
_symmetry_space_group_name_H-M 'P 1 21/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,1/2+z'
  '-x,1/2+y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
S   0.17100   0.02500   0.29400
O1   0.00100   0.27500   0.16900
O2   0.27000   0.20000   0.43100
O3   0.28100  -0.15000   0.20700