data_global
_chemical_name_mineral 'Cordierite'
loop_
_publ_author_name
'Gibbs G V'
_journal_name_full 'American Mineralogist'
_journal_volume 51
_journal_year 1966
_journal_page_first 1068
_journal_page_last 1087
_publ_section_title
;
 The polymorphism of cordierite I: The crystal structure of low cordierite
;
_database_code_amcsd 149
_chemical_formula_sum 'Al4 Si5 (Mg1.54 Fe.46) O18.48 Li.12 Na.1 Ca.03 K.02 H.96'
_cell_length_a 17.083
_cell_length_b 9.738
_cell_length_c 9.335
_cell_angle_alpha 90.0
_cell_angle_beta 90.0
_cell_angle_gamma 90.0
_cell_volume 1552.917
_exptl_crystal_density_diffrn  2.623
_symmetry_space_group_name_H-M 'C c c m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,y,1/2+z'
  '1/2-x,1/2+y,1/2+z'
  'x,-y,1/2-z'
  '1/2+x,1/2-y,1/2-z'
  'x,y,-z'
  '1/2+x,1/2+y,-z'
  '-x,-y,z'
  '1/2-x,1/2-y,z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Al1   0.25  0.25  0.25  1.0  0.00279
Si2   0.0  0.5  0.25  0.92  0.00253
Al2   0.0  0.5  0.25  0.08  0.00253
Si3   0.1923  0.0781  0.0  1.0  0.00329
Si4   0.1351  -0.2372  0.0  1.0  0.00291
Al5   0.0506  0.3084  0.0  0.96  0.00317
Si5   0.0506  0.3084  0.0  0.04  0.00317
Mg   0.3374  0.0  0.25  0.77  0.00291
Fe   0.3374  0.0  0.25  0.23  0.00291
O1   0.2466  -0.104  0.3591  1.0  0.00342
O2   0.0616  -0.4167  0.3494  1.0  0.00304
O3   -0.173  -0.3091  0.3583  1.0  0.00393
O4   0.0434  -0.2453  0.0  1.0  0.00317
O5   0.1224  0.1848  0.0  1.0  0.00823
O6   0.1639  -0.0788  0.0  1.0  0.00684
Wat   0.0  0.0  0.25  0.48  0.0903
Li   0.0  0.0  0.25  0.12  0.0903
Na   0.0  0.0  0.25  0.1  0.0903
Ca   0.0  0.0  0.25  0.03  0.0903
K   0.0  0.0  0.25  0.02  0.0903