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 GRA25
 Note: T = 25 C
;
_database_code_amcsd 0018532
_chemical_compound_source 'Grant County, New Mexico, USA'
_chemical_formula_sum 'Si6 Mg3.864 O22 H12'
_cell_length_a 13.3638
_cell_length_b 27.0034
_cell_length_c 5.2716
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1902.352
_exptl_crystal_density_diffrn      2.187
_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   0.20050   0.02750   0.58200   1.00000   0.01482
Si2   0.20950   0.14130   0.57700   1.00000   0.01482
Si3   0.20610   0.19600   0.07700   1.00000   0.01482
Mg1   0.00000   0.02460   0.25000   0.96600   0.02039
Mg2   0.00000   0.09140   0.75000   0.96600   0.02039
Mg3   0.00000   0.14490   0.25000   0.96600   0.02039
Mg4   0.00000   0.20330   0.75000   0.96600   0.02039
O9   0.25000   0.25000   0.08300   1.00000   0.01026
O1   0.08200   0.02170   0.58700   1.00000   0.01026
O3   0.06600   0.14010   0.58100   1.00000   0.01026
O4   0.09470   0.19810   0.05900   1.00000   0.01026
O5   0.26450   0.00470   0.35700   1.00000   0.01026
O6   0.24980   0.08210   0.59500   1.00000   0.01026
O7   0.26390   0.16150   0.30600   1.00000   0.01026
O8   0.29940   0.16400   0.76900   1.00000   0.01026
O-H2   0.08790   0.08330   0.07700   1.00000   0.01026
Wat10   0.07120   0.26190   0.53600   1.00000   0.01026
Wat1   0.06350   0.42100   0.06300   0.75000   0.06295
Wat2   0.00000   0.63890   0.25000   0.75000   0.06295
Wat3   0.00000   0.47930   0.25000   0.75000   0.06295