data_global _chemical_name_mineral 'Palygorskite' loop_ _publ_author_name 'Post J E' 'Heaney P J' _journal_name_full 'American Mineralogist' _journal_volume 93 _journal_year 2008 _journal_page_first 667 _journal_page_last 675 _publ_section_title ; Synchotron powder X-ray diffraction study of the structure and dehydration behavior of palygorskite Sample: T = 300 K ; _database_code_amcsd 0004564 _chemical_compound_source 'Yulu River, Korea' _chemical_formula_sum 'Al2.2 Mg2.14 Si7.8 O30 H18' _cell_length_a 13.2858 _cell_length_b 17.8476 _cell_length_c 5.2419 _cell_angle_alpha 90 _cell_angle_beta 107.560 _cell_angle_gamma 90 _cell_volume 1185.038 _exptl_crystal_density_diffrn 2.322 _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 _atom_site_occupancy _atom_site_U_iso_or_equiv AlM1 0.00000 0.08040 0.50000 1.00000 0.00500 MgM2 0.00000 0.16810 0.00000 1.00000 0.00500 MgM3 0.00000 0.00000 0.00000 0.14000 0.00500 Si1 0.21400 0.08450 0.97200 0.97500 0.01000 Al1 0.21400 0.08450 0.97200 0.02500 0.01000 Si2 0.20810 0.16400 0.47600 0.97500 0.01000 Al2 0.20810 0.16400 0.47600 0.02500 0.01000 O1 0.06670 0.00000 0.41300 1.00000 0.01000 O2 0.08380 0.08830 0.85300 1.00000 0.01000 O3 0.08000 0.15860 0.38800 1.00000 0.01000 Wat4 0.10270 0.25280 0.91600 1.00000 0.01000 O5 0.25000 0.25000 0.50000 1.00000 0.01000 O6 0.25200 0.00000 0.00400 1.00000 0.01000 O7 0.25700 0.12640 0.26000 1.00000 0.01000 O8 0.26610 0.12320 0.76100 1.00000 0.01000 Wat1 0.45000 0.00000 0.69700 1.00000 0.12000 Wat2 0.47200 0.14870 0.55100 0.50000 0.05000 H 0.13000 0.00000 0.42000 1.00000 0.01500