data_global
_chemical_name_mineral 'Carbon'
loop_
_publ_author_name
'Ownby P D'
'Yang X'
'Liu J'
_journal_name_full 'Journal of the American Ceramic Society'
_journal_volume 75 
_journal_year 1992
_journal_page_first 1876
_journal_page_last 1883
_publ_section_title
;
 Calculated X-ray diffraction data for diamond polytypes
 Note: hexagonal, 2H structure known as lonsdaleite
 Note: theoretically calculated structure values
;
_database_code_amcsd 0014066
_chemical_formula_sum 'C'
_cell_length_a 2.5221
_cell_length_b 2.5221
_cell_length_c 4.1186
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 22.688
_exptl_crystal_density_diffrn      3.516
_symmetry_space_group_name_H-M 'P 63/m m c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-x+y,1/2+z'
  'x,x-y,1/2-z'
  '-x+y,-x,1/2-z'
  'x-y,x,1/2+z'
  '-y,-x,z'
  'y,x,-z'
  'y,-x+y,-z'
  '-y,x-y,z'
  'x-y,-y,1/2+z'
  '-x+y,y,1/2-z'
  'x,y,1/2-z'
  '-x,-y,1/2+z'
  'x,x-y,z'
  '-x,-x+y,-z'
  'x-y,x,-z'
  '-x+y,-x,z'
  'y,x,1/2+z'
  '-y,-x,1/2-z'
  '-y,x-y,1/2-z'
  'y,-x+y,1/2+z'
  '-x+y,y,z'
  'x-y,-y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
C   0.33333   0.66667   0.06250