data_global
_chemical_name_mineral 'Fluoro-richterite'
loop_
_publ_author_name
'Cameron M'
'Sueno S'
'Papike J J'
'Prewitt C T'
_journal_name_full 'American Mineralogist'
_journal_volume 68 
_journal_year 1983
_journal_page_first 924
_journal_page_last 943
_publ_section_title
;
 High temperature crystal chemistry of K and Na fluor-richterites
 Note: sample Na, T = 400 C
;
_database_code_amcsd 0000913
_chemical_formula_sum 'Si8 Mg5 (Na2 Ca2) K4 O22 F2'
_cell_length_a 9.979
_cell_length_b 18.036
_cell_length_c 5.270
_cell_angle_alpha 90
_cell_angle_beta 106.71
_cell_angle_gamma 90
_cell_volume 908.448
_exptl_crystal_density_diffrn      3.724
_symmetry_space_group_name_H-M 'I 1 2/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  'x,-y,z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,1/2-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Si1   0.28040   0.91587   0.98578
Si2   0.28722   0.82937   0.48674
Mg1   0.00000   0.91087   0.50000
Mg2   0.00000   0.82056   0.00000
Mg3   0.00000   0.00000   0.00000
Na   0.00000   0.72394   0.50000
Ca   0.00000   0.72394   0.50000
K   0.47151   0.98846   0.53999
O1   0.11320   0.91566   0.89528
O2   0.11917   0.83241   0.39232
F3   0.10293   0.00000   0.39066
O4   0.36139   0.75208   0.56502
O5   0.34760   0.87095   0.26011
O6   0.34386   0.88214   0.75969
O7   0.34191   0.00000   0.04870
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Si1 0.01024 0.00982 0.00904 0.00078 0.00279 -0.00001
Si2 0.01113 0.01173 0.00903 0.00171 0.00253 0.00018
Mg1 0.01423 0.01345 0.01105 0.00000 0.00361 0.00000
Mg2 0.01412 0.01389 0.01363 0.00000 0.03517 0.00000
Mg3 0.01423 0.01065 0.01086 0.00000 0.00454 0.00000
Na 0.03371 0.01819 0.01832 0.00000 -0.00404 0.00000
Ca 0.03371 0.01819 0.01832 0.00000 -0.00404 0.00000
K 0.08114 0.06453 0.06278 -0.03277 -0.03490 -0.00005
O1 0.01109 0.01374 0.01159 0.00078 0.00202 -0.00117
O2 0.01143 0.01837 0.01277 0.00129 0.00289 -0.00209
F3 0.02114 0.01664 0.01735 0.00000 0.00451 0.00000
O4 0.02365 0.01584 0.01725 0.00779 0.00506 0.00246
O5 0.01598 0.02304 0.01475 0.00101 0.00352 0.00868
O6 0.01771 0.02291 0.01295 -0.00104 0.00577 -0.00739
O7 0.01742 0.00873 0.02873 0.00000 0.00360 0.00000