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: M422 ; _database_code_amcsd 0005016 _chemical_compound_source 'Belgorod, Low Amur, Russia' _chemical_formula_sum 'K Al2 Si4 O12 H2' _cell_length_a 5.1994 _cell_length_b 8.9815 _cell_length_c 10.233 _cell_angle_alpha 90 _cell_angle_beta 101.60 _cell_angle_gamma 90 _cell_volume 468.105 _exptl_crystal_density_diffrn 2.834 _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 0.41890 0.32790 0.26900 O1 0.34740 0.30860 0.10600 O2 0.50130 0.50000 0.31230 O3 0.66970 0.22290 0.33500 O-H 0.41880 0.00000 0.09980