data_global
_chemical_name_mineral 'Antarcticite'
loop_
_publ_author_name
'Agron P A'
'Busing W R'
_journal_name_full 'Acta Crystallographica, Section C'
_journal_volume 42 
_journal_year 1986
_journal_page_first 141
_journal_page_last 143
_publ_section_title
;
 Calcium and strontium dichloride hexahydrates by neutron diffraction
;
_database_code_amcsd 0010027
_chemical_formula_sum 'Ca Cl2 O6 H12'
_cell_length_a 7.8759
_cell_length_b 7.8758
_cell_length_c 3.9545
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 212.431
_exptl_crystal_density_diffrn      1.712
_symmetry_space_group_name_H-M 'P 3 2 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'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Ca   0.00000   0.00000   0.00000   0.01786
Cl   0.33330   0.66670   0.42490   0.02736
O1   0.31140   0.00000   0.00000   0.02862
O2  -0.21320   0.00000   0.50000   0.02457
H1   0.43260   0.09880  -0.09260   0.05231
H2  -0.23300   0.11130   0.48350   0.04534