data_global _chemical_name_mineral 'Magadiite' loop_ _publ_author_name 'Garces J M' 'Rocke S C' 'Crowder C E' 'Hasha D L' _journal_name_full 'Clays and Clay Minerals' _journal_volume 36 _journal_year 1988 _journal_page_first 409 _journal_page_last 418 _publ_section_title ; Hypothetical structures of magadiite and sodium octosilicate and structural relationships between the layered alkali metal silicates and the mordenite- and pentasil-group zeolites Note: hypothetical model structure Note: setting changed from left- to right-handed ; _database_code_amcsd 0012231 _chemical_formula_sum 'Si6 O13' _cell_length_a 27.5 _cell_length_b 7.52 _cell_length_c 9.20 _cell_angle_alpha 90 _cell_angle_beta 101 _cell_angle_gamma 90 _cell_volume 1867.605 _exptl_crystal_density_diffrn 1.339 _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 Si1 0.21126 0.29551 0.84561 Si2 0.20801 0.28739 0.35290 Si3 0.12449 0.00000 0.73781 Si4 0.12371 0.00000 0.37788 O1 0.16201 0.16926 0.80020 O2 0.15677 0.17826 0.35159 O3 0.25739 0.30479 0.75460 O4 0.11734 0.00000 0.55363 O5 0.20147 0.50000 0.32162 O6 0.19115 0.50000 0.85903 O7 0.25000 0.25000 0.00000 O8 0.25000 0.25000 0.50000 O9 0.06741 0.00000 0.77744 O10 0.06851 0.00000 0.27024