data_global
_chemical_name_mineral 'Norsethite'
loop_
_publ_author_name
'Lippmann F'
_journal_name_full 'Naturwissenschaften'
_journal_volume 54 
_journal_year 1967
_journal_page_first 514
_journal_page_last 514
_publ_section_title
;
 Die kristallstruktur des norsethit, BaMg(CO3)2,
 im vergleich zum dolomit, CaMg(CO3)2
;
_database_code_amcsd 0014695
_chemical_formula_sum 'Ba Mg C2 O6'
_cell_length_a 5.017
_cell_length_b 5.017
_cell_length_c 16.77
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 365.554
_exptl_crystal_density_diffrn      3.838
_symmetry_space_group_name_H-M 'R 3 2'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '2/3+x,1/3+y,1/3+z'
  '1/3+x,2/3+y,2/3+z'
  '-x,-x+y,-z'
  '2/3-x,1/3-x+y,1/3-z'
  '1/3-x,2/3-x+y,2/3-z'
  'y,x,-z'
  '2/3+y,1/3+x,1/3-z'
  '1/3+y,2/3+x,2/3-z'
  'x-y,-y,-z'
  '2/3+x-y,1/3-y,1/3-z'
  '1/3+x-y,2/3-y,2/3-z'
  '-y,x-y,z'
  '2/3-y,1/3+x-y,1/3+z'
  '1/3-y,2/3+x-y,2/3+z'
  '-x+y,-x,z'
  '2/3-x+y,1/3-x,1/3+z'
  '1/3-x+y,2/3-x,2/3+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ba   0.00000   0.00000   0.00000
Mg   0.00000   0.00000   0.50000
C   0.00000   0.00000   0.24200
O   0.19900  -0.08900   0.24200