data_global
_chemical_name_mineral 'Norrishite'
loop_
_publ_author_name
'Tyrna P L'
'Guggenheim S'
_journal_name_full 'American Mineralogist'
_journal_volume 76 
_journal_year 1991
_journal_page_first 266
_journal_page_last 271
_publ_section_title
;
 The crystal structure of norrishite, KLiMn2Si4O12: An oxygen-rich mica
;
_database_code_amcsd 0001348
_chemical_formula_sum 'K Li Mn2 Si4 O12'
_cell_length_a 5.289
_cell_length_b 8.914
_cell_length_c 10.062
_cell_angle_alpha 90
_cell_angle_beta 98.22
_cell_angle_gamma 90
_cell_volume 469.511
_exptl_crystal_density_diffrn      3.256
_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
K   0.00000   0.50000   0.00000
Li1   0.00000   0.00000   0.50000
Mn2   0.00000   0.34720   0.50000
Si   0.06290   0.17070   0.22700
O1   0.04500   0.00000   0.16700
O2   0.29700   0.24860   0.16150
O3   0.10800   0.17870   0.38530
O4   0.10900   0.50000   0.39600
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
K 0.02360 0.02013 0.03869 0.00000 0.00528 0.00000
Li1 0.01249 0.01610 0.02010 0.00000 0.00528 0.00000
Mn2 0.00541 0.00443 0.01909 0.00000 0.00291 0.00000
Si 0.00611 0.00483 0.02010 0.00000 0.00211 0.00000
O1 0.01388 0.00765 0.02512 0.00000 0.00264 0.00000
O2 0.00972 0.01610 0.02060 -0.00591 0.00158 0.00045
O3 0.00694 0.00564 0.02211 0.00047 0.00396 -0.00090
O4 0.01249 0.00604 0.02512 0.00000 0.00528 0.00000