data_global
_chemical_name_mineral 'Calcite'
loop_
_publ_author_name
'Maslen E N'
'Streltsov V A'
'Streltsova N R'
'Ishizawa N'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 51 
_journal_year 1995
_journal_page_first 929
_journal_page_last 939
_publ_section_title
;
 Electron density and optical anisotropy in rhombohedral carbonates.
 III. Synchrotron X-ray studies of CaCO3, MgCO3 and MnCO3
;
_database_code_amcsd 0009890
_chemical_formula_sum 'Ca C O3'
_cell_length_a 4.988
_cell_length_b 4.988
_cell_length_c 17.068
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 367.761
_exptl_crystal_density_diffrn      2.712
_symmetry_space_group_name_H-M 'R -3 c'
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,1/2+z'
  '2/3+x,1/3+x-y,5/6+z'
  '1/3+x,2/3+x-y,1/6+z'
  'y,x,1/2-z'
  '2/3+y,1/3+x,5/6-z'
  '1/3+y,2/3+x,1/6-z'
  '-x+y,y,1/2+z'
  '2/3-x+y,1/3+y,5/6+z'
  '1/3-x+y,2/3+y,1/6+z'
  '-x,-x+y,1/2-z'
  '2/3-x,1/3-x+y,5/6-z'
  '1/3-x,2/3-x+y,1/6-z'
  '-y,-x,1/2+z'
  '2/3-y,1/3-x,5/6+z'
  '1/3-y,2/3-x,1/6+z'
  'x-y,-y,1/2-z'
  '2/3+x-y,1/3-y,5/6-z'
  '1/3+x-y,2/3-y,1/6-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'
  '-x,-y,-z'
  '2/3-x,1/3-y,1/3-z'
  '1/3-x,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
Ca   0.00000   0.00000   0.00000
C   0.00000   0.00000   0.25000
O   0.25700   0.00000   0.25000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Ca 0.00988 0.00988 0.00932 0.00494 0.00000 0.00000
C 0.00834 0.00834 0.01080 0.00417 0.00000 0.00000
O 0.01129 0.02200 0.02020 0.01100 -0.00424 -0.00848