data_global
_chemical_name_mineral 'Cryptomelane'
loop_
_publ_author_name
'Vicat J'
'Fanchon E'
'Strobel P'
'Tran Qui D'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 42 
_journal_year 1986
_journal_page_first 162
_journal_page_last 167
_publ_section_title
;
 The structure of K1.33Mn8O16 and cation ordering in hollandite-type structures
 _cod_database_code 1008322
;
_database_code_amcsd 0016237
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'K.333 Mn2 O4'
_cell_length_a 9.866
_cell_length_b 9.866
_cell_length_c 2.872
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 279.555
_exptl_crystal_density_diffrn      4.441
_symmetry_space_group_name_H-M 'I 4/m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  'y,-x,-z'
  '1/2+y,1/2-x,1/2-z'
  '-y,x,z'
  '1/2-y,1/2+x,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'
  '-y,x,-z'
  '1/2-y,1/2+x,1/2-z'
  'y,-x,z'
  '1/2+y,1/2-x,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
_atom_site_occupancy
K   0.00000   0.00000   0.37540   0.33330
Mn   0.34891   0.16621   0.00000   1.00000
O1   0.15445   0.20295   0.00000   1.00000
O2   0.54206   0.16496   0.00000   1.00000