data_global
_chemical_name_mineral 'Sepiolite'
loop_
_publ_author_name
'Post J E'
'Bish D L'
'Heaney P J'
_journal_name_full 'American Mineralogist'
_journal_volume 92 
_journal_year 2007
_journal_page_first 91
_journal_page_last 97
_publ_section_title
;
 Synchrotron powder X-ray diffraction study of the structure and dehydration
 behavior of sepiolite
 Sample: T = room temperature, in air
;
_database_code_amcsd 0004269
_chemical_compound_source 'Durango, Mexico'
_chemical_formula_sum 'Mg4 Si6 O22.91 H13.82'
_cell_length_a 13.405
_cell_length_b 27.016
_cell_length_c 5.2750
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1910.339
_exptl_crystal_density_diffrn      2.247
_symmetry_space_group_name_H-M 'P n c n'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-x,1/2+y,1/2+z'
  '1/2+x,1/2-y,1/2-z'
  '1/2+x,1/2+y,-z'
  '1/2-x,1/2-y,z'
  'x,-y,1/2+z'
  '-x,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
_atom_site_U_iso_or_equiv
Mg1   0.00000   0.02970   0.25000   1.00000   0.04000
Mg2   0.00000   0.08500   0.75000   1.00000   0.04000
Mg3   0.00000   0.14340   0.25000   1.00000   0.04000
Mg4   0.00000   0.20490   0.75000   1.00000   0.04000
Si1   0.20260   0.02820   0.58600   1.00000   0.04000
Si2   0.19730   0.14090   0.57600   1.00000   0.04000
Si3   0.20420   0.19490   0.07000   1.00000   0.04000
O1   0.08240   0.02760   0.58500   1.00000   0.03500
O-H2   0.08050   0.08540   0.08100   1.00000   0.03500
O3   0.07620   0.14310   0.59700   1.00000   0.03500
O4   0.08470   0.19710   0.07700   1.00000   0.03500
O5   0.24800   0.00400   0.32400   1.00000   0.03500
O6   0.24510   0.08490   0.57900   1.00000   0.03500
O7   0.24300   0.17080   0.33400   1.00000   0.03500
O8   0.24900   0.17360   0.80200   1.00000   0.03500
O9   0.25000   0.25000   0.08900   1.00000   0.03500
Wat10   0.08800   0.25960   0.59400   1.00000   0.03500
Wat11   0.56200   0.91000   0.98800   0.91000   0.10000
Wat12   0.50000   0.18000   0.25000   1.00000   0.10000
Wat13   0.50000   0.02300   0.25000   0.43000   0.10000
Wat14   0.43900   0.15700   0.74000   0.33000   0.10000