data_global
_chemical_name_mineral 'Mullite'
loop_
_publ_author_name
'Fischer R X'
'Schmucker M'
'Angerer P'
'Schneider H'
_journal_name_full 'American Mineralogist'
_journal_volume 86 
_journal_year 2001
_journal_page_first 1513
_journal_page_last 1518
_publ_section_title
;
 Crystal structures of Na and K aluminate mullites
 Sample: K
;
_database_code_amcsd 0002750
_chemical_formula_sum 'K.335 Al3 O4.665'
_cell_length_a 7.6934
_cell_length_b 7.6727
_cell_length_c 2.93231
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 173.092
_exptl_crystal_density_diffrn      3.236
_symmetry_space_group_name_H-M 'P b a m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,z'
  '1/2-x,1/2+y,-z'
  '1/2-x,1/2+y,z'
  '1/2+x,1/2-y,-z'
  'x,y,-z'
  '-x,-y,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
K   0.00000   0.50000   0.50000   0.33500   0.03420
Al1   0.00000   0.00000   0.00000   1.00000   0.01292
AlT   0.15430   0.33000   0.50000   0.66750   0.01039
AlT*   0.26780   0.19180   0.50000   0.33250   0.01140
Oab   0.36220   0.41780   0.50000   1.00000   0.01900
Oc*   0.44120   0.05250   0.50000   0.33250   0.00507
Od   0.13460   0.20780   0.00000   1.00000   0.01520