data_global
_chemical_name_mineral 'Mica'
loop_
_publ_author_name
'Hazen R M'
'Finger L W'
'Velde D'
_journal_name_full 'American Mineralogist'
_journal_volume 66 
_journal_year 1981
_journal_page_first 586
_journal_page_last 591
_publ_section_title
;
 Crystal structure of a silica- and alkali-rich trioctahedral mica
;
_database_code_amcsd 0000836
_chemical_formula_sum '(Si3.312 Fe.688) (Mg2.664 Li.225 Na.111) K O10 F2'
_cell_length_a 5.329
_cell_length_b 9.230
_cell_length_c 10.219
_cell_angle_alpha 90
_cell_angle_beta 100
_cell_angle_gamma 90
_cell_volume 495.002
_exptl_crystal_density_diffrn      2.935
_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
Si   0.57490   0.16670   0.22550   0.82800
Fe   0.57490   0.16670   0.22550   0.17200
Mg1   0.00000   0.50000   0.50000   0.88800
Li1   0.00000   0.50000   0.50000   0.07500
Na1   0.00000   0.50000   0.50000   0.03700
Mg2   0.00000   0.83370   0.50000   0.88800
Li2   0.00000   0.83370   0.50000   0.07500
Na2   0.00000   0.83370   0.50000   0.03700
K   0.00000   0.00000   0.00000   1.00000
O1   0.81980   0.23550   0.16720   1.00000
O2   0.52640   0.00000   0.16690   1.00000
O3   0.62980   0.16700   0.39010   1.00000
F   0.13360   0.00000   0.39920   1.00000

