data_global _chemical_name_mineral 'Sodicgedrite' 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 002 ; _database_code_amcsd 216 _chemical_formula_sum 'Si5.96 Al3.4 Mg3.05 Fe2.53 Ca.04 Na.54 O24' _cell_length_a 18.601 _cell_length_b 17.839 _cell_length_c 5.284 _cell_angle_alpha 90.0 _cell_angle_beta 90.0 _cell_angle_gamma 90.0 _cell_volume 1753.354 _exptl_crystal_density_diffrn 3.305 _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 0.2323 -0.1626 -0.4505 0.73 0.00709 Al1A 0.2323 -0.1626 -0.4505 0.27 0.00709 Si1B 0.0199 -0.1641 0.3018 0.56 0.00633 Al1B 0.0199 -0.1641 0.3018 0.44 0.00633 Si2A 0.2282 -0.0759 0.0509 0.98 0.00557 Al2A 0.2282 -0.0759 0.0509 0.02 0.00557 Si2B 0.0268 -0.0799 -0.1947 0.71 0.00747 Al2B 0.0268 -0.0799 -0.1947 0.29 0.00747 Mg1 0.1242 0.1603 0.3705 0.67 0.00899 Fe1 0.1242 0.1603 0.3705 0.33 0.00899 Al2 0.1247 0.0724 -0.129 0.68 0.0038 Mg2 0.1247 0.0724 -0.129 0.23 0.0038 Fe2 0.1247 0.0724 -0.129 0.09 0.0038 Mg3 0.1243 0.25 -0.1294 0.61 0.00722 Fe3 0.1243 0.25 -0.1294 0.39 0.00722 Fe4 0.1184 -0.0153 0.3635 0.65 0.00785 Mg4 0.1184 -0.0153 0.3635 0.32 0.00785 Ca4 0.1184 -0.0153 0.3635 0.02 0.00785 Na4 0.1184 -0.0153 0.3635 0.01 0.00785 Na 0.1171 -0.25 0.848 0.52 0.01938 O1A 0.179 0.1581 0.0315 1.0 0.00988 O1B 0.0701 0.1568 -0.29 1.0 0.00963 O2A 0.185 0.0731 -0.4409 1.0 0.01013 O2B 0.0635 0.0739 0.1808 1.0 0.01077 O3A 0.1811 0.25 -0.4662 1.0 0.00975 O3B 0.0701 0.25 0.2111 1.0 0.0114 O4A 0.1863 0.0028 0.0445 1.0 0.01077 O4B 0.0685 -0.0049 -0.2986 1.0 0.01089 O5A 0.1973 -0.11 0.3215 1.0 0.00988 O5B 0.0545 -0.1014 0.0989 1.0 0.01279 O6A 0.203 -0.132 -0.1763 1.0 0.01418 O6B 0.0473 -0.1461 -0.4036 1.0 0.01393 O7A 0.205 -0.25 0.5141 1.0 0.01494 O7B 0.0453 -0.25 0.2154 1.0 0.00975