data_9000146
_chemical_name 'Vermiculite'
loop_
_publ_author_name
'Shirozu H'
'Bailey S W'
_journal_name_full "American Mineralogist"
_journal_volume 51
_journal_year 1966
_journal_page_first 1124
_journal_page_last 1143
_publ_section_title
;
 Crystal structure of a two-layer Mg-vermiculite
;
_chemical_formula_sum 'Mg1.705 (Si1.43 Al.57) O7.86 H2.2'
_cell_length_a 5.349
_cell_length_b 9.255
_cell_length_c 28.89
_cell_angle_alpha 90
_cell_angle_beta 97.12
_cell_angle_gamma 90
_cell_volume 1419.171
_symmetry_space_group_name_H-M 'C 1 2/c 1'
loop_
_symmetry_equiv_pos_as_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'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_Uiso_or_equiv
Mg1   0.00000   0.16380   0.25000   1.00000   0.01216
Mg2   0.00000   0.49970   0.25000   1.00000   0.01039
Mg3   0.00000   0.83320   0.25000   1.00000   0.01089
Mg4   0.00000   0.00000   0.00000   0.41000   0.02913
Si1   0.10420   0.99970   0.15450   0.71500   0.01558
Al1   0.10420   0.99970   0.15450   0.28500   0.01558
Si2   0.10260   0.66470   0.15470   0.71500   0.01051
Al2   0.10260   0.66470   0.15470   0.28500   0.01051
O1   0.14240   0.00390   0.21320   1.00000   0.01051
O2   0.14100   0.66830   0.21130   1.00000   0.01330
O3   0.35790   0.06970   0.13380   1.00000   0.02647
O4   0.35290   0.59640   0.13460   1.00000   0.02546
O5   0.55930   0.33160   0.13390   1.00000   0.02457
O-H   0.14200   0.33800   0.21290   1.00000   0.01532
Wat1   0.33630   0.97360   0.03970   0.62000 ?
Wat2   0.35150   0.32740   0.04120   0.62000 ?
Wat3   0.38320   0.65200   0.04140   0.62000 ?