data_9000833
_chemical_name 'Lepidolite-2M2'
loop_
_publ_author_name
'Guggenheim S'
_journal_name_full "American Mineralogist"
_journal_volume 66
_journal_year 1981
_journal_page_first 1221
_journal_page_last 1232
_publ_section_title
;
 Cation ordering in lepidolite
 type 2M(2)  from Radkovice
;
_chemical_formula_sum 'K Li1.24 Al1.158 Si3.492 O11 F'
_cell_length_a 9.023
_cell_length_b 5.197
_cell_length_c 20.171
_cell_angle_alpha 90
_cell_angle_beta 99.48
_cell_angle_gamma 90
_cell_volume 932.952
_symmetry_space_group_name_H-M 'C 1 2/c 1'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-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
K   0.50000   0.40970   0.25000   1.00000
Li1   0.25000   0.25000   0.00000   1.00000
Al1   0.58561   0.24370   0.00005   0.32500
Li2   0.58561   0.24370   0.00005   0.12000
Si1   0.79426   0.40780   0.13397   0.87300
Al1   0.79426   0.40780   0.13397   0.12700
Si2   0.12556   0.41360   0.13394   0.87300
Al2   0.12556   0.41360   0.13394   0.12700
O1   0.76760   0.39370   0.05270   1.00000
O2   0.09050   0.42610   0.05283   1.00000
O3   0.44680   0.42910   0.04923   0.50000
F3   0.44680   0.42910   0.04923   0.50000
O4   0.70580   0.17740   0.16634   1.00000
O5   0.23800   0.17850   0.16219   1.00000
O6   0.97160   0.37870   0.16611   1.00000