data_global _chemical_name_mineral 'Gedrite' loop_ _publ_author_name 'Papike J J' 'Ross M' _journal_name_full 'American Mineralogist' _journal_volume 55 _journal_year 1970 _journal_page_first 1945 _journal_page_last 1972 _publ_section_title ; Gedrites: Crystal structures and intracrystalline cation distributions sample 001 ; _database_code_amcsd 215 _chemical_formula_sum 'Si6.24 Al2.96 Mg4.48 Fe1.26 Ca.04 Na.36 O24' _cell_length_a 18.531 _cell_length_b 17.741 _cell_length_c 5.249 _cell_angle_alpha 90.0 _cell_angle_beta 90.0 _cell_angle_gamma 90.0 _cell_volume 1725.653 _exptl_crystal_density_diffrn 3.188 _symmetry_space_group_name_H-M 'P n m a' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,z' '-x,1/2+y,-z' '1/2-x,1/2+y,1/2+z' '1/2+x,1/2-y,1/2-z' '1/2+x,y,1/2-z' '1/2-x,-y,1/2+z' '-x,-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 Si1A 0.2315 -0.1631 -0.4487 0.66 0.00545 Al1A 0.2315 -0.1631 -0.4487 0.34 0.00545 Si1B 0.0202 -0.1645 0.2971 0.62 0.00532 Al1B 0.0202 -0.1645 0.2971 0.38 0.00532 Si2A 0.2278 -0.076 0.0502 1.0 0.00583 Si2B 0.0266 -0.0802 -0.1985 0.84 0.00735 Al2B 0.0266 -0.0802 -0.1985 0.16 0.00735 Mg1 0.1244 0.1611 0.3737 0.88 0.0095 Fe1 0.1244 0.1611 0.3737 0.12 0.0095 Al2 0.1248 0.0731 -0.1281 0.6 0.00431 Mg2 0.1248 0.0731 -0.1281 0.36 0.00431 Fe2 0.1248 0.0731 -0.1281 0.04 0.00431 Mg3 0.1249 0.25 -0.1248 0.9 0.00595 Fe3 0.1249 0.25 -0.1248 0.1 0.00595 Mg4 0.1189 -0.0145 0.3636 0.55 0.00798 Fe4 0.1189 -0.0145 0.3636 0.42 0.00798 Ca4 0.1189 -0.0145 0.3636 0.02 0.00798 Na4 0.1189 -0.0145 0.3636 0.01 0.00798 Na 0.1151 -0.25 0.8533 0.34 0.01862 O1A 0.1796 0.1603 0.0312 1.0 0.00507 O1B 0.0695 0.1584 -0.286 1.0 0.01165 O2A 0.184 0.0737 -0.4436 1.0 0.0133 O2B 0.0622 0.0742 0.1875 1.0 0.00633 O3A 0.1797 0.25 -0.4571 1.0 0.01292 O3B 0.07 0.25 0.2087 1.0 0.0095 O4A 0.1868 0.0022 0.0425 1.0 0.00785 O4B 0.0679 -0.0046 -0.2985 1.0 0.00937 O5A 0.1968 -0.109 0.3206 1.0 0.01343 O5B 0.0549 -0.1026 0.0943 1.0 0.00912 O6A 0.2022 -0.1313 -0.1752 1.0 0.00925 O6B 0.0472 -0.145 -0.4097 1.0 0.01887 O7A 0.203 -0.25 0.5138 1.0 0.00823 O7B 0.0454 -0.25 0.2153 1.0 0.01659