data_global
_chemical_name_mineral 'Illite'
loop_
_publ_author_name
'Drits V A'
'Zviagina B B'
'McCarty D K'
'Salyn A L'
_journal_name_full 'American Mineralogist'
_journal_volume 95 
_journal_year 2010
_journal_page_first 348
_journal_page_last 361
_publ_section_title
;
 Factors responsible for crystal-chemical variations in the solid solutions
 from illite to aluminoceladonite and from glauconite to celadonite
 Sample Name: Zempleni
;
_database_code_amcsd 0005020
_chemical_compound_source 'Fuzerradvany, Hungary'
_chemical_formula_sum 'K Al2 Si4 O12 H2'
_cell_length_a 5.2042
_cell_length_b 8.9852
_cell_length_c 10.205
_cell_angle_alpha 90
_cell_angle_beta 101.49
_cell_angle_gamma 90
_cell_volume 467.631
_exptl_crystal_density_diffrn      2.837
_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   0.50000
Al   0.50000   0.16670   0.00000
Si   0.41840   0.32810   0.26920
O1   0.34930   0.31080   0.10660
O2   0.49350   0.50000   0.31370
O3   0.67220   0.22670   0.33500
O-H   0.41980   0.00000   0.10130