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 GRA225
 Note: T = 225 C
;
_database_code_amcsd 0018531
_chemical_compound_source 'Grant County, New Mexico, USA'
_chemical_formula_sum 'Si6 Mg3.864 O19 H6'
_cell_length_a 13.3317
_cell_length_b 27.049
_cell_length_c 5.2694
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1900.194
_exptl_crystal_density_diffrn      2.001
_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   0.02750   0.58600   1.00000   0.01710
Si2   0.20770   0.14050   0.56900   1.00000   0.01710
Si3   0.21000   0.19570   0.06800   1.00000   0.01710
Mg1   0.00000   0.03610   0.25000   0.96600   0.01836
Mg2   0.00000   0.08800   0.75000   0.96600   0.01836
Mg3   0.00000   0.14740   0.25000   0.96600   0.01836
Mg4   0.00000   0.19980   0.75000   0.96600   0.01836
O9   0.25000   0.25000   0.09200   1.00000   0.01292
O1   0.09010   0.02590   0.59900   1.00000   0.01292
O3   0.08030   0.14480   0.58600   1.00000   0.01292
O4   0.07450   0.19720   0.05200   1.00000   0.01292
O5   0.25060   0.00310   0.32900   1.00000   0.01292
O6   0.24980   0.08780   0.59800   1.00000   0.01292
O7   0.28000   0.16590   0.31600   1.00000   0.01292
O8   0.26990   0.16800   0.80800   1.00000   0.01292
O-H2   0.07440   0.08610   0.07900   1.00000   0.01292
Wat10   0.08590   0.25590   0.55700   1.00000   0.01292