data_global
_chemical_name_mineral 'Romarchite'
loop_
_publ_author_name
'Pannetier J'
'Denes G'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 36 
_journal_year 1980
_journal_page_first 2763
_journal_page_last 2765
_publ_section_title
;
 Tin(II) oxide: structure refinement and thermal expansion
;
_database_code_amcsd 0009724
_chemical_formula_sum 'Sn O'
_cell_length_a 3.8029
_cell_length_b 3.8029
_cell_length_c 4.8382
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 69.970
_exptl_crystal_density_diffrn      6.394
_symmetry_space_group_name_H-M 'P 4/n m m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-y,1/2-x,z'
  'y,x,-z'
  'y,-x,-z'
  '1/2-y,1/2+x,z'
  'x,-y,z'
  '1/2-x,1/2+y,-z'
  '1/2+x,1/2+y,-z'
  '-x,-y,z'
  '1/2+y,1/2+x,z'
  '-y,-x,-z'
  '-y,x,-z'
  '1/2+y,1/2-x,z'
  '-x,y,z'
  '1/2+x,1/2-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Sn   0.50000   0.00000   0.23830   0.00722
O   0.00000   0.00000   0.00000   0.01254