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 = 600 C
;
_database_code_amcsd 0000919
_chemical_formula_sum 'Si8 Mg5 (Na2 Ca2) K2 O22 F2'
_cell_length_a 10.070
_cell_length_b 18.106
_cell_length_c 5.278
_cell_angle_alpha 90
_cell_angle_beta 105.83
_cell_angle_gamma 90
_cell_volume 925.828
_exptl_crystal_density_diffrn      3.374
_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   0.27535   0.91553   0.97689
Si2   0.28512   0.82913   0.48056
Mg1   0.00000   0.91004   0.50000
Mg2   0.00000   0.81969   0.00000
Mg3   0.00000   0.00000   0.00000
Na   0.00000   0.72173   0.50000
Ca   0.00000   0.72173   0.50000
K   0.47591   0.00000   0.52685
O1   0.11045   0.91472   0.89143
O2   0.11865   0.83085   0.39228
F3   0.10255   0.00000   0.38740
O4   0.36150   0.75314   0.55935
O5   0.34323   0.87167   0.25022
O6   0.33956   0.88191   0.75179
O7   0.33308   0.00000   0.02869
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 0.01236 0.01242 0.01126 0.00012 0.00198 -0.00031
Si2 0.01370 0.01418 0.01133 0.00242 0.00306 0.00100
Mg1 0.01752 0.01817 0.01513 0.00000 0.00407 0.00000
Mg2 0.01824 0.01704 0.01613 0.00000 0.00111 0.00000
Mg3 0.01849 0.01501 0.01344 0.00000 0.00687 0.00000
Na 0.04076 0.02312 0.02355 0.00000 -0.00637 0.00000
Ca 0.04076 0.02312 0.02355 0.00000 -0.00637 0.00000
K 0.07458 0.05610 0.06024 0.00000 -0.02875 0.00000
O1 0.01596 0.01975 0.01537 0.00177 0.00212 -0.00300
O2 0.01351 0.02426 0.01399 0.00188 0.00307 -0.00299
F3 0.02680 0.02745 0.01785 0.00000 0.00353 0.00000
O4 0.03188 0.02011 0.02532 0.01065 0.00709 0.00215
O5 0.01826 0.02848 0.01756 0.00213 0.00373 0.00816
O6 0.02105 0.02926 0.01620 -0.00201 0.00743 -0.00919
O7 0.02366 0.01214 0.03213 0.00000 0.00309 0.00000