data_global
_chemical_name_mineral 'Montroydite'
loop_
_publ_author_name
'Aurivillius K'
_journal_name_full 'Acta Chemica Scandinavica'
_journal_volume 18 
_journal_year 1964
_journal_page_first 1305
_journal_page_last 1306
_publ_section_title
;
 Least-squares refinement of the crystal structures of orthorhombic HgO and of
 Hg2O2NaI
;
_database_code_amcsd 0011897
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Hg O'
_cell_length_a 6.6129
_cell_length_b 5.5208
_cell_length_c 3.5219
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 128.579
_exptl_crystal_density_diffrn     11.189
_symmetry_space_group_name_H-M 'P n m a'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,z'
  '-x,1/2+y,-z'
  '1/2-x,1/2+y,1/2+z'
  '1/2+x,1/2-y,1/2-z'
  '1/2+x,y,1/2-z'
  '1/2-x,-y,1/2+z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Hg   0.11360   0.25000   0.24560   0.01520
O   0.35920   0.25000   0.59550   0.01862