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 0000216 _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 _cell_angle_beta 90 _cell_angle_gamma 90 _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 0.23230 -0.16260 -0.45050 0.73000 0.00709 Al1A 0.23230 -0.16260 -0.45050 0.27000 0.00709 Si1B 0.01990 -0.16410 0.30180 0.56000 0.00633 Al1B 0.01990 -0.16410 0.30180 0.44000 0.00633 Si2A 0.22820 -0.07590 0.05090 0.98000 0.00557 Al2A 0.22820 -0.07590 0.05090 0.02000 0.00557 Si2B 0.02680 -0.07990 -0.19470 0.71000 0.00747 Al2B 0.02680 -0.07990 -0.19470 0.29000 0.00747 Mg1 0.12420 0.16030 0.37050 0.67000 0.00899 Fe1 0.12420 0.16030 0.37050 0.33000 0.00899 Al2 0.12470 0.07240 -0.12900 0.68000 0.00380 Mg2 0.12470 0.07240 -0.12900 0.23000 0.00380 Fe2 0.12470 0.07240 -0.12900 0.09000 0.00380 Mg3 0.12430 0.25000 -0.12940 0.61000 0.00722 Fe3 0.12430 0.25000 -0.12940 0.39000 0.00722 Fe4 0.11840 -0.01530 0.36350 0.65000 0.00785 Mg4 0.11840 -0.01530 0.36350 0.32000 0.00785 Ca4 0.11840 -0.01530 0.36350 0.02000 0.00785 Na4 0.11840 -0.01530 0.36350 0.01000 0.00785 Na 0.11710 -0.25000 0.84800 0.52000 0.01938 O1A 0.17900 0.15810 0.03150 1.00000 0.00988 O1B 0.07010 0.15680 -0.29000 1.00000 0.00963 O2A 0.18500 0.07310 -0.44090 1.00000 0.01013 O2B 0.06350 0.07390 0.18080 1.00000 0.01077 O3A 0.18110 0.25000 -0.46620 1.00000 0.00975 O3B 0.07010 0.25000 0.21110 1.00000 0.01140 O4A 0.18630 0.00280 0.04450 1.00000 0.01077 O4B 0.06850 -0.00490 -0.29860 1.00000 0.01089 O5A 0.19730 -0.11000 0.32150 1.00000 0.00988 O5B 0.05450 -0.10140 0.09890 1.00000 0.01279 O6A 0.20300 -0.13200 -0.17630 1.00000 0.01418 O6B 0.04730 -0.14610 -0.40360 1.00000 0.01393 O7A 0.20500 -0.25000 0.51410 1.00000 0.01494 O7B 0.04530 -0.25000 0.21540 1.00000 0.00975