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 K, T = 24 C
;
_database_code_amcsd 0000917
_chemical_formula_sum 'Si8 Mg5 (Na2 Ca2) K2 O22 F2'
_cell_length_a 9.992
_cell_length_b 17.972
_cell_length_c 5.260
_cell_angle_alpha 90
_cell_angle_beta 105.80
_cell_angle_gamma 90
_cell_volume 908.883
_exptl_crystal_density_diffrn      3.437
_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   0.27718   0.91516   0.97689
Si2   0.28578   0.82849   0.48046
Mg1   0.00000   0.91066   0.50000
Mg2   0.00000   0.82096   0.00000
Mg3   0.00000   0.00000   0.00000
Na   0.00000   0.72275   0.50000
Ca   0.00000   0.72275   0.50000
K   0.48506   0.00000   0.50833
O1   0.11123   0.91497   0.89186
O2   0.11799   0.83136   0.39182
F3   0.10146   0.00000   0.38746
O4   0.36099   0.75146   0.56411
O5   0.34538   0.86971   0.24961
O6   0.34176   0.88259   0.74865
O7   0.33586   0.00000   0.03284
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 0.00513 0.00461 0.00551 0.00098 0.00090 -0.00014
Si2 0.00481 0.00602 0.00410 0.00028 0.00040 0.00001
Mg1 0.00690 0.00687 0.00434 0.00000 0.00204 0.00000
Mg2 0.00785 0.00596 0.00867 0.00000 0.00093 0.00000
Mg3 0.00698 0.00486 0.00754 0.00000 0.00093 0.00000
Na 0.01464 0.00723 0.00685 0.00000 -0.00165 0.00000
Ca 0.01464 0.00723 0.00685 0.00000 -0.00165 0.00000
K 0.05518 0.03430 0.04327 0.00000 -0.03208 0.00000
O1 0.00540 0.00666 0.00666 0.00129 0.00163 -0.00032
O2 0.00612 0.00918 0.00666 -0.00029 0.00197 -0.00126
F3 0.00952 0.00862 0.00767 0.00000 -0.00064 0.00000
O4 0.01029 0.00969 0.00909 0.00594 0.00167 -0.00033
O5 0.00903 0.01136 0.00764 -0.00073 0.00211 0.00253
O6 0.00707 0.01129 0.00861 -0.00033 0.00201 -0.00362
O7 0.01134 0.00391 0.01212 0.00000 -0.00042 0.00000