data_global
_chemical_name_mineral 'Richterite'
loop_
_publ_author_name
'Senda K'
'Ishida K'
'Jenkins D M'
_journal_name_full 'American Mineralogist'
_journal_volume 90 
_journal_year 2005
_journal_page_first 1062
_journal_page_last 1071
_publ_section_title
;
 X-ray Rietveld refinement and FTIR spectra of synthetic (Si,Ge)-richterites
 Sample: Ge8Ri, Si0Ge100
;
_database_code_amcsd 0003796
_chemical_formula_sum 'Na1.62 Ca.84 Mg5 Ge8 O24 H2'
_cell_length_a 10.3244
_cell_length_b 18.282
_cell_length_c 5.3994
_cell_angle_alpha 90
_cell_angle_beta 106.015
_cell_angle_gamma 90
_cell_volume 979.587
_exptl_crystal_density_diffrn      3.930
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,z'
  '1/2+x,1/2-y,z'
  '-x,y,-z'
  '1/2-x,1/2+y,-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_U_iso_or_equiv
NaA   0.00000   0.50000   0.00000   0.46000   0.03394
Ca4   0.00000   0.27450   0.50000   0.42000   0.02001
Na4   0.00000   0.27450   0.50000   0.58000   0.02001
Mg1   0.00000   0.08680   0.50000   1.00000   0.00595
Mg2   0.00000   0.17810   0.00000   1.00000   0.00773
Mg3   0.00000   0.00000   0.00000   1.00000   0.00532
Ge1   0.27950   0.08560   0.30900   1.00000   0.00646
Ge2   0.28700   0.17450   0.81470   1.00000   0.00633
O1   0.10700   0.08410   0.21800   1.00000   0.00874
O2   0.11300   0.17050   0.73100   1.00000   0.00811
O-H3   0.10400   0.00000   0.71800   1.00000   0.00811
O4   0.36300   0.25200   0.78000   1.00000   0.01216
O5   0.35000   0.14240   0.14800   1.00000   0.01089
O6   0.34500   0.10430   0.63100   1.00000   0.01064
O7   0.34200   0.00000   0.24600   1.00000   0.01178