data_global
_chemical_name_mineral 'Dickite'
loop_
_publ_author_name
'Bish D L'
'Johnston C T'
_journal_name_full 'Clays and Clay Minerals'
_journal_volume 41 
_journal_year 1993
_journal_page_first 297
_journal_page_last 304
_publ_section_title
;
 Rietveld refinement and Fourier-transform infrared spectroscopic
 study of the dickite structure at low temperature
 Note: Sample at T = 12 K
;
_database_code_amcsd 0012236
_chemical_compound_source 'St. Claire, Pennsylvania, USA'
_chemical_formula_sum 'Si2 Al2 O9 H4'
_cell_length_a 5.1474
_cell_length_b 8.9386
_cell_length_c 14.390
_cell_angle_alpha 90
_cell_angle_beta 96.483
_cell_angle_gamma 90
_cell_volume 657.858
_exptl_crystal_density_diffrn      2.607
_symmetry_space_group_name_H-M 'C 1 c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+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_U_iso_or_equiv
Si1   0.01260   0.39920   0.03980   0.00030
Si2   0.99770   0.06920   0.04030   0.00030
Al1   0.91270   0.24890   0.22830   0.00270
Al2   0.41330   0.41490   0.22760   0.00270
O1   0.95500   0.23520   0.99380   0.00150
O2   0.25770   0.46950   0.99320   0.00150
O3   0.76630   0.50540   0.00860   0.00150
O4   0.07860   0.38800   0.15160   0.00150
O5   0.00520   0.07900   0.15230   0.00150
O-h6   0.58140   0.27220   0.15640   0.00320
O-h7   0.24420   0.27610   0.29760   0.00320
O-h8   0.24470   0.89140   0.29900   0.00320
O-h9   0.31910   0.58130   0.29740   0.00320
H1   0.47950   0.18480   0.15490   0.01840
H2   0.29570   0.25580   0.36270   0.01410
H3   0.32600   0.94560   0.35150   0.02300
H4   0.28910   0.58130   0.36050   0.01900