data_global
_chemical_name_mineral 'Leucite'
loop_
_publ_author_name
'Dove M T'
'Cool T'
'Palmer D C'
'Putnis A'
'Salje E K H'
'Winkler B'
_journal_name_full 'American Mineralogist'
_journal_volume 78 
_journal_year 1993
_journal_page_first 486
_journal_page_last 492
_publ_section_title
;
 On the role of Al-Si ordering in the cubic-tetragonal phase transition of
 leucite
 Sample is Disordered
;
_database_code_amcsd 0001556
_chemical_formula_sum 'K (Si2 Al) O6'
_cell_length_a 12.988
_cell_length_b 12.988
_cell_length_c 13.800
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 2327.896
_exptl_crystal_density_diffrn      2.491
_symmetry_space_group_name_H-M 'I 41/a'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  '3/4+y,1/4-x,1/4-z'
  '1/4+y,3/4-x,3/4-z'
  '3/4-y,1/4+x,1/4+z'
  '1/4-y,3/4+x,3/4+z'
  '1/2+x,y,1/2-z'
  '+x,1/2+y,-z'
  '1/2-x,-y,1/2+z'
  '-x,1/2-y,+z'
  '3/4-y,3/4+x,3/4-z'
  '1/4-y,1/4+x,1/4-z'
  '3/4+y,3/4-x,3/4+z'
  '1/4+y,1/4-x,1/4+z'
  '-x,-y,-z'
  '1/2-x,1/2-y,1/2-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
K   0.36600   0.36310   0.10730   1.00000
Si1   0.05630   0.39710   0.16710   0.66667
Al1   0.05630   0.39710   0.16710   0.33333
Si2   0.16680   0.61150   0.12690   0.66667
Al2   0.16680   0.61150   0.12690   0.33333
Si3   0.39290   0.64070   0.08480   0.66667
Al3   0.39290   0.64070   0.08480   0.33333
O1   0.13270   0.31620   0.10970   1.00000
O2   0.08810   0.51350   0.13290   1.00000
O3   0.14590   0.68190   0.22570   1.00000
O4   0.13250   0.68570   0.03590   1.00000
O5   0.28940   0.57330   0.11830   1.00000
O6   0.48390   0.61610   0.16590   1.00000