data_global
_chemical_name_mineral 'Portlandite'
loop_
_publ_author_name
'Desgranges L'
'Grebille D'
'Calvarin g'
'Chevrier G'
'Floquet N'
'Niepce J'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 49 
_journal_year 1993
_journal_page_first 812
_journal_page_last 817
_publ_section_title
;
 Hydrogen thermal motion in calcium hydroxide: Ca (O H)2
 _cod_database_code 1001769
;
_database_code_amcsd 0009875
_chemical_formula_sum 'O2 H2 Ca'
_cell_length_a 3.589
_cell_length_b 3.589
_cell_length_c 4.911
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 54.783
_exptl_crystal_density_diffrn      2.246
_symmetry_space_group_name_H-M 'P -3 m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-y,-x,z'
  'y,-x+y,-z'
  '-x,-x+y,-z'
  '-x+y,-x,z'
  '-x+y,y,z'
  '-x,-y,-z'
  'y,x,-z'
  '-y,x-y,z'
  'x,x-y,z'
  'x-y,x,-z'
  'x-y,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
O1   0.33333   0.66667   0.76590
H1   0.33333   0.66667   0.57150
Ca1   0.00000   0.00000   0.00000
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
O1 0.00320 0.00320 0.00490 0.00160 0.00000 0.00000
H1 0.03460 0.03460 0.01070 0.01730 0.00000 0.00000
Ca1 0.00160 0.00160 0.00620 0.00080 0.00000 0.00000