data_global
_amcsd_formula_title 'Co2Al4Si5O18'
loop_
_publ_author_name
'Knorr K'
'Meschke M'
'Winkler B'
_journal_name_full 'Physics and Chemistry of Minerals'
_journal_volume 26 
_journal_year 1999
_journal_page_first 521
_journal_page_last 529
_publ_section_title
;
 Structural and magnetic properties of Co2Al4Si5O18
 and Mn2Al4Si5O18 cordierite
;
_database_code_amcsd 0008229
_chemical_formula_sum 'Co2 (Al4 Si5) O18'
_cell_length_a 9.841
_cell_length_b 9.841
_cell_length_c 9.372
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 786.034
_exptl_crystal_density_diffrn      2.764
_symmetry_space_group_name_H-M 'P 6/m c c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-x+y,1/2+z'
  'x,x-y,1/2-z'
  '-x+y,-x,-z'
  'x-y,x,z'
  '-y,-x,1/2+z'
  'y,x,1/2-z'
  'y,-x+y,-z'
  '-y,x-y,z'
  'x-y,-y,1/2+z'
  '-x+y,y,1/2-z'
  'x,y,-z'
  '-x,-y,z'
  'x,x-y,1/2+z'
  '-x,-x+y,1/2-z'
  'x-y,x,-z'
  '-x+y,-x,z'
  'y,x,1/2+z'
  '-y,-x,1/2-z'
  '-y,x-y,-z'
  'y,-x+y,z'
  '-x+y,y,1/2+z'
  'x-y,-y,1/2-z'
  '-x,-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
Co   0.33333   0.66667   0.25000   1.00000   0.01254
AlT1   0.50000   0.50000   0.25000   0.66667   0.02520
SiT1   0.50000   0.50000   0.25000   0.33333   0.02520
AlT2   0.36700   0.26200   0.00000   0.33333   0.02520
SiT2   0.36700   0.26200   0.00000   0.66667   0.02520
O1   0.48090   0.34620   0.14330   1.00000   0.00013
O2   0.22730   0.30380   0.00000   1.00000   0.00013