data_global _chemical_name_mineral 'Aenigmatite' loop_ _publ_author_name 'Cannillo E' 'Mazzi F' 'Fang J H' 'Robinson P D' 'Ohya Y' _journal_name_full 'American Mineralogist' _journal_volume 56 _journal_year 1971 _journal_page_first 427 _journal_page_last 446 _publ_section_title ; The crystal structure of aenigmatite sample CM ; _database_code_amcsd 224 _chemical_formula_sum 'Fe5 Ti Na2 Si6 O20' _cell_length_a 10.406 _cell_length_b 10.813 _cell_length_c 8.926 _cell_angle_alpha 104.93 _cell_angle_beta 96.87 _cell_angle_gamma 125.32 _cell_volume 744.464 _exptl_crystal_density_diffrn 3.844 _symmetry_space_group_name_H-M 'P -1' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Fe1 0.0 0.0 0.5 0.01127 Fe2 0.0 0.5 0.0 0.01077 Fe3 0.3193 0.8513 0.1779 0.01153 Fe4 0.767 0.8203 0.1517 0.00861 Fe5 0.0952 0.9382 0.0522 0.01241 Fe6 0.5962 0.9435 0.0662 0.01039 Ti1 0.997 0.7428 0.2565 0.00785 Na1 0.2092 0.6289 0.3893 0.01684 Na2 0.6627 0.6127 0.3733 0.01798 Si1 0.4798 0.2333 0.3311 0.01039 Si2 0.9879 0.2363 0.3456 0.00861 Si3 0.7925 0.3435 0.2424 0.01064 Si4 0.2782 0.3364 0.2257 0.01089 Si5 0.6478 0.9448 0.445 0.00963 Si6 0.3525 0.5573 0.0501 0.00988 O1 0.36 0.0684 0.163 0.01292 O2 0.864 0.0688 0.18 0.01786 O3 0.5488 0.9535 0.2957 0.0152 O4 0.0087 0.9233 0.2648 0.01507 O5 0.2364 0.8751 0.3951 0.01507 O6 0.7523 0.8821 0.3912 0.01393 O7 0.4967 0.1947 0.4965 0.01267 O8 0.9603 0.7756 0.4843 0.01241 O9 0.9069 0.33 0.3717 0.01824 O10 0.4091 0.3408 0.3539 0.0095 O11 0.671 0.1773 0.0749 0.01824 O12 0.1565 0.1694 0.0646 0.01292 O13 0.5197 0.7094 0.0365 0.01317 O14 0.0671 0.7334 0.0776 0.00988 O15 0.2453 0.6098 0.1152 0.01912 O16 0.7572 0.6022 0.123 0.0176 O17 0.404 0.4995 0.1882 0.01279 O18 0.937 0.5164 0.2269 0.01456 O19 0.1708 0.3661 0.3271 0.01153 O20 0.6749 0.364 0.3422 0.01178