data_global
_chemical_name_mineral 'Cordierite'
loop_
_publ_author_name
'Schwartz K B'
'Leong D B'
'McConville R L'
_journal_name_full 'Physics and Chemistry of Minerals'
_journal_volume 20 
_journal_year 1994
_journal_page_first 563
_journal_page_last 574
_publ_section_title
;
 Structural chemistry of synthetic cordierite: evidence for solid solutions
 and disordered compositional domains in Bi-flux-grown Mg-cordierites
 Sample: Crystallized from glass at 1200 degrees C for 350 hours
 Note: tetrahedral site occupancies are assumed, not refined
;
_database_code_amcsd 0007854
_chemical_formula_sum 'Mg2 Al4 Si5 O18'
_cell_length_a 17.047
_cell_length_b 9.7315
_cell_length_c 9.3463
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1550.485
_exptl_crystal_density_diffrn      2.506
_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
MgM   0.33900   0.00000   0.25000  -0.01900
AlT11   0.25000   0.25000   0.25200  -0.02748
SiT16   0.00000   0.50000   0.25000  -0.02748
SiT21   0.18890   0.07400   0.00000  -0.02748
SiT23   0.13140  -0.23600   0.00000  -0.02748
AlT26   0.05270   0.29900   0.00000  -0.02748
O11   0.24100  -0.09600   0.36200  -0.02406
O16   0.06800  -0.40500   0.35200  -0.02406
O13  -0.17800  -0.30800   0.35700  -0.02406
O26   0.04700  -0.22700   0.00000  -0.02406
O11   0.11400   0.18000   0.00000  -0.02406
O23   0.14800  -0.08300   0.00000  -0.02406