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 = 600 C
;
_database_code_amcsd 0000914
_chemical_formula_sum 'Si8 Mg5 (Na2 Ca2) K4 O22 F2'
_cell_length_a 10.008
_cell_length_b 18.087
_cell_length_c 5.278
_cell_angle_alpha 90
_cell_angle_beta 106.69
_cell_angle_gamma 90
_cell_volume 915.147
_exptl_crystal_density_diffrn      3.697
_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   0.27989   0.91595   0.98570
Si2   0.28713   0.82960   0.48662
Mg1   0.00000   0.91075   0.50000
Mg2   0.00000   0.82015   0.00000
Mg3   0.00000   0.00000   0.00000
Na   0.00000   0.72360   0.50000
Ca   0.00000   0.72360   0.50000
K   0.47008   0.98846   0.54266
O1   0.11309   0.91558   0.89536
O2   0.11913   0.83233   0.39217
F3   0.10330   0.00000   0.39088
O4   0.36195   0.75264   0.56413
O5   0.34723   0.87170   0.26031
O6   0.34331   0.88220   0.75995
O7   0.34129   0.00000   0.04569
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 0.01304 0.01220 0.01157 0.00082 0.00385 -0.00029
Si2 0.01290 0.01417 0.01205 0.00215 0.00336 0.00044
Mg1 0.01802 0.01657 0.01390 0.00000 0.00434 0.00000
Mg2 0.01851 0.01778 0.01714 0.00000 0.00422 0.00000
Mg3 0.01827 0.01324 0.01517 0.00000 0.00713 0.00000
Na 0.04374 0.02342 0.02384 0.00000 -0.00582 0.00000
Ca 0.04374 0.02342 0.02384 0.00000 -0.00582 0.00000
K 0.09207 0.07716 0.06808 -0.02610 -0.03195 0.01129
O1 0.01387 0.01631 0.01634 0.00177 0.00399 -0.00090
O2 0.01537 0.02302 0.01511 0.00159 0.00309 -0.00227
F3 0.02574 0.02088 0.02343 0.00000 0.00502 0.00000
O4 0.03004 0.01893 0.02288 0.00994 0.00726 0.00265
O5 0.01916 0.02877 0.01868 0.00119 0.00602 0.00980
O6 0.02134 0.02811 0.01848 -0.00033 0.00701 -0.00944
O7 0.02183 0.01127 0.03464 0.00000 0.00383 0.00000