data_global
_chemical_name_mineral 'Cordierite'
loop_
_publ_author_name
'Koepke J'
'Schulz H'
_journal_name_full 'Physics and Chemistry of Minerals'
_journal_volume 13 
_journal_year 1986
_journal_page_first 165
_journal_page_last 173
_publ_section_title
;
 Single crystal structure investigations under high-pressure of the
 mineral cordierite with an improved high-pressure cell
 Sample: P = 0.3 GPa
;
_database_code_amcsd 0007384
_chemical_compound_source 'Zabargad island, Red Sea'
_chemical_formula_sum 'Mg2 Al4 Si5 O18'
_cell_length_a 17.058
_cell_length_b 9.724
_cell_length_c 9.336
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1548.581
_exptl_crystal_density_diffrn      2.509
_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_U_iso_or_equiv
Mg   0.16290   0.50000   0.25000   0.01460
Al11   0.25000   0.25000   0.24930   0.01380
Si16   0.00000   0.50000   0.25000   0.01330
Si21   0.19380   0.07780   0.00000   0.01330
Al26   0.05010   0.30730   0.00000   0.00960
Si23  -0.13540   0.23760   0.00000   0.01170
O11   0.24830   0.10380   0.14160   0.01250
O16   0.06110   0.41670   0.15090   0.01720
O13  -0.17370   0.30880   0.14240   0.02090
O21   0.12230   0.18800   0.00000   0.02170
O26  -0.04400   0.25150   0.00000   0.00920
O23  -0.16460   0.07930   0.00000   0.01530