data_global
_chemical_name_mineral 'Richterite'
loop_
_publ_author_name
'Robert J-L'
'Della Ventura G'
'Raudsepp M'
'Hawthorne F C'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 5 
_journal_year 1993
_journal_page_first 199
_journal_page_last 206
_publ_section_title
;
 Rietveld structure refinement of synthetic strontium-rich potassium-richterites
 Sample: KSr_100
;
_database_code_amcsd 0006477
_chemical_formula_sum 'K Mg5 (Na Sr) Si8 O24 H2'
_cell_length_a 10.1534
_cell_length_b 18.115
_cell_length_c 5.2723
_cell_angle_alpha 90
_cell_angle_beta 105.421
_cell_angle_gamma 90
_cell_volume 934.816
_exptl_crystal_density_diffrn      3.133
_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
KA   0.01270   0.50000   0.02280   0.50000   0.02913
MgM1   0.00000   0.08980   0.50000   1.00000   0.00760
MgM2   0.00000   0.17990   0.00000   1.00000   0.00760
MgM3   0.00000   0.00000   0.00000   1.00000   0.00760
NaM4   0.00000   0.28040   0.50000   0.50000   0.01140
SrM4   0.00000   0.28040   0.50000   0.50000   0.01140
SiT1   0.27170   0.08480   0.30710   1.00000   0.00507
SiT2   0.28400   0.17090   0.81150   1.00000   0.00507
O1   0.10250   0.08760   0.21850   1.00000   0.01013
O2   0.11720   0.16960   0.72680   1.00000   0.01013
O-H3   0.10850   0.00000   0.71880   1.00000   0.01013
O4   0.35570   0.24680   0.80130   1.00000   0.01013
O5   0.33720   0.12820   0.10540   1.00000   0.01393
O6   0.33510   0.11360   0.60520   1.00000   0.01393
O7   0.32750   0.00000   0.31000   1.00000   0.01520