data_global
_chemical_name_mineral 'Grumantite'
loop_
_publ_author_name
'Yamnova N Y'
'Pushcharovsky D Y'
'Andrianov V I'
'Rastsvetaeva R K'
'Khomyakov A P'
'Mikheeva M G'
_journal_name_full 'Soviet Physics Doklady'
_journal_volume 34 
_journal_year 1989
_journal_page_first 284
_journal_page_last 286
_publ_section_title
;
 A new type of silicon-oxygen group in the structure of grumantite
 Na[Si2O4(OH)]*H2O
;
_database_code_amcsd 0015617
_chemical_compound_source 'Lovozero massif, Kola Peninsula, Russia'
_chemical_formula_sum 'Na Si2 O6 H3'
_cell_length_a 15.979
_cell_length_b 18.25
_cell_length_c 7.169
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 2090.601
_exptl_crystal_density_diffrn      2.264
_symmetry_space_group_name_H-M 'F d d 2'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2+y,1/2+z'
  '1/2+x,y,1/2+z'
  '1/2+x,1/2+y,z'
  '1/4+x,1/4-y,1/4+z'
  '1/4+x,3/4-y,3/4+z'
  '3/4+x,1/4-y,3/4+z'
  '3/4+x,3/4-y,1/4+z'
  '1/4-x,1/4+y,1/4+z'
  '1/4-x,3/4+y,3/4+z'
  '3/4-x,1/4+y,3/4+z'
  '3/4-x,3/4+y,1/4+z'
  '-x,1/2-y,1/2+z'
  '-x,-y,+z'
  '1/2-x,1/2-y,+z'
  '1/2-x,-y,1/2+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Na   0.13820   0.23850   0.88680   0.01824
Si1   0.10300   0.22580   0.37530   0.00709
Si2   0.22410   0.09070   0.37190   0.00646
O1   0.16910   0.16180   0.42890   0.01343
O2   0.15890   0.02430   0.31490   0.01026
O4   0.04130   0.14520   0.96660   0.01140
O6   0.01400   0.18730   0.32330   0.00988
O-h5   0.11830   0.02530   0.95130   0.01482
Ow3   0.00790   0.08430   0.62760   0.01887
H1   0.01500   0.11200   0.72000   0.01900
H2   0.01000   0.12000   0.54000   0.01900
H3   0.09500   0.07100   0.97000   0.01900