data_global
_chemical_name_mineral 'Natrolite'
loop_
_publ_author_name
'Baur W H'
'Kassner D'
'Kim C'
'Sieber N H W'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 2 
_journal_year 1990
_journal_page_first 761
_journal_page_last 769
_publ_section_title
;
 Flexibility and distortion of the framework of natrolite: crystal
 structures of ion-exchanged natrolites
 Sample: K-natrolite, KK
;
_database_code_amcsd 0006393
_chemical_formula_sum 'K2 Al2 Si3 O12 H4'
_cell_length_a 19.27
_cell_length_b 19.66
_cell_length_c 6.469
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 2450.769
_exptl_crystal_density_diffrn      2.236
_symmetry_space_group_name_H-M 'F d d 2'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2+y,1/2+z'
  '1/2+x,y,1/2+z'
  '1/2+x,1/2+y,z'
  '1/4+x,1/4-y,1/4+z'
  '1/4+x,3/4-y,3/4+z'
  '3/4+x,1/4-y,3/4+z'
  '3/4+x,3/4-y,1/4+z'
  '1/4-x,1/4+y,1/4+z'
  '1/4-x,3/4+y,3/4+z'
  '3/4-x,1/4+y,3/4+z'
  '3/4-x,3/4+y,1/4+z'
  '-x,1/2-y,1/2+z'
  '-x,-y,+z'
  '1/2-x,1/2-y,+z'
  '1/2-x,-y,1/2+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
K   0.21850   0.53100   0.12100
Al   0.20230   0.33590   0.85900
Si1   0.00000   0.00000   0.00000
Si2   0.16140   0.20280   0.62000
O1   0.04180   0.05410   0.85900
O2   0.16330   0.41550   0.86000
O3   0.15410   0.27890   0.71300
O4   0.28590   0.34160   0.76100
O5   0.94470   0.04090   0.14100
Wat   0.17430   0.42410   0.37000