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: 10564 ; _database_code_amcsd 0005029 _chemical_compound_source 'Athabasca basement; Saskatchewan, Canada' _chemical_formula_sum 'K Al2 Si4 O12 H2' _cell_length_a 5.1973 _cell_length_b 8.999 _cell_length_c 10.147 _cell_angle_alpha 90 _cell_angle_beta 99.00 _cell_angle_gamma 90 _cell_volume 468.737 _exptl_crystal_density_diffrn 2.830 _symmetry_space_group_name_H-M 'C 1 2 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' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z K 0.50000 0.65280 0.50000 Al1 0.50000 0.16670 0.00000 Al2 0.00000 0.33330 0.00000 Si1 0.43330 0.99210 0.26920 Si2 0.91850 0.82050 0.26920 O1 0.41520 0.99860 0.10630 O2 0.34320 0.30790 0.10630 O3 0.99580 0.65710 0.33430 O4 0.15850 0.93710 0.31290 O5 0.66960 0.88170 0.33430 O-H 0.84080 0.19000 0.10080