data_global
_chemical_name_mineral 'Sepiolite'
loop_
_publ_author_name
'Sanchez M'
'Garcia-Romero E'
'Suarez M'
'Silva I'
'Fuentes-Montero L'
'Martinez-Criado G'
_journal_name_full 'American Mineralogist'
_journal_volume 96 
_journal_year 2011
_journal_page_first 1443
_journal_page_last 1454
_publ_section_title
;
 Variability in sepiolite: Diffraction studies
 Note: Sample NOR25
 Note: T = 25 C
;
_database_code_amcsd 0018534
_chemical_compound_source 'Fauske, Nordland, Norway'
_chemical_formula_sum 'Si6 Mg3.84 O22 H12'
_cell_length_a 13.4074
_cell_length_b 27.0244
_cell_length_c 5.2767
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1911.891
_exptl_crystal_density_diffrn      2.175
_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
Si1   0.19900   0.02720   0.58300   1.00000   0.00798
Si2   0.20910   0.14050   0.57400   1.00000   0.00798
Si3   0.20030   0.19670   0.08000   1.00000   0.00798
Mg1   0.00000   0.03000   0.25000   0.96000   0.00950
Mg2   0.00000   0.08870   0.75000   0.96000   0.00950
Mg3   0.00000   0.14510   0.25000   0.96000   0.00950
Mg4   0.00000   0.20410   0.75000   0.96000   0.00950
O9   0.25000   0.25000   0.07700   1.00000   0.00608
O1   0.09000   0.02570   0.56600   1.00000   0.00608
O3   0.07300   0.13990   0.58300   1.00000   0.00608
O4   0.08190   0.19630   0.08600   1.00000   0.00608
O5   0.25350   0.00650   0.33200   1.00000   0.00608
O6   0.24010   0.07910   0.60100   1.00000   0.00608
O7   0.24440   0.16640   0.33500   1.00000   0.00608
O8   0.26210   0.17000   0.77600   1.00000   0.00608
O-H2   0.08620   0.08350   0.09300   1.00000   0.00608
Wat10   0.07810   0.26110   0.55700   1.00000   0.00608
Wat1   0.06310   0.39230   0.99900   0.75000   0.06725
Wat2   0.00000   0.63740   0.25000   0.75000   0.06725
Wat3   0.00000   0.48510   0.25000   0.75000   0.06725