data_global
_chemical_name_mineral 'Varennesite'
loop_
_publ_author_name
'Grice J D'
'Gault R A'
_journal_name_full 'The Canadian Mineralogist'
_journal_volume 33 
_journal_year 1995
_journal_page_first 1073
_journal_page_last 1081
_publ_section_title
;
 Varennesite, a new species of hydrated Na-Mn silicate with a unique
 monophyllosilicate structure
;
_database_code_amcsd 0005463
_chemical_formula_sum 'Na8 Mn2 Si10 O39 H2'
_cell_length_a 13.447
_cell_length_b 15.022
_cell_length_c 17.601
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 3555.417
_exptl_crystal_density_diffrn      2.243
_symmetry_space_group_name_H-M 'C m c m'
loop_
_space_group_symop_operation_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'
  '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_U_iso_or_equiv
Na1   0.50000   0.04800   0.33720   0.00120
Na2   0.74190   0.04380   0.33850   0.00200
Na3   0.86890   0.00000   0.50000   0.00310
Mn   0.62160   0.00000   0.50000   0.00100
Si1   0.38610   0.12230   0.75000   0.00070
Si2   0.28190   0.16370   0.59430   0.00070
Si3   0.11350   0.29240   0.55220   0.00060
O1   0.50000   0.15960   0.75000   0.00130
O2   0.37880   0.01740   0.75000   0.00140
O3   0.33260   0.17150   0.82200   0.00140
O4   0.17930   0.22220   0.60210   0.00150
O5   0.14590   0.27920   0.46330   0.00090
O6   0.26760   0.06500   0.56550   0.00120
O7   0.50000   0.24590   0.44080   0.00100
O8   0.12620   0.39270   0.57880   0.00110
O-H   0.50000   0.05240   0.56050   0.00210
OW1   0.26790   0.17290   0.25000   0.00420
OW2   0.50000   0.17580   0.25000   0.00590
OW3   0.88780   0.11430   0.39850   0.00410
OW4   0.00000   0.06650   0.57660   0.00300
OW5   0.90570  -0.03220   0.25000   0.00090
OW6   0.00000   0.15180   0.25000   0.00620