data_global
_chemical_name_mineral 'Apophyllite-(KF)'
loop_
_publ_author_name
'Stahl K'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 5 
_journal_year 1993
_journal_page_first 845
_journal_page_last 849
_publ_section_title
;
 A neutron powder diffraction study of partially dehydrated
 fluorapophyllite, KCa4Si8O20F*6.9H2O
;
_database_code_amcsd 0006492
_chemical_formula_sum 'F K Ca4 Si8 O26.88 H13.76'
_cell_length_a 8.9639
_cell_length_b 8.9639
_cell_length_c 15.754
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1265.857
_exptl_crystal_density_diffrn      2.327
_symmetry_space_group_name_H-M 'P 4/m n c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-y,1/2-x,1/2+z'
  '1/2+y,1/2+x,1/2-z'
  'y,-x,-z'
  '-y,x,z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  'x,y,-z'
  '-x,-y,z'
  '1/2+y,1/2+x,1/2+z'
  '1/2-y,1/2-x,1/2-z'
  '-y,x,-z'
  'y,-x,z'
  '1/2-x,1/2+y,1/2+z'
  '1/2+x,1/2-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
F   0.00000   0.00000   0.00000   1.00000
K   0.00000   0.00000   0.50000   1.00000
Ca   0.11500   0.24020   0.00000   1.00000
Si   0.23170   0.08730   0.19170   1.00000
O1   0.36240   0.13760   0.25000   1.00000
O2   0.08940   0.19150   0.21590   1.00000
O3   0.26630   0.10210   0.09230   1.00000
O4   0.21320   0.44890   0.09030   0.69000
O5   0.18480   0.48780   0.00000   0.34000
H1   0.44650   0.17220   0.08940   0.69000
H2   0.22090   0.42570   0.14920   0.69000
H3   0.15740   0.55050   0.03660   0.34000