data_global _chemical_name_mineral 'Indium-fluor-eckermannite' loop_ _publ_author_name 'Raudsepp M' 'Turnock A C' 'Hawthorne F C' _journal_name_full 'American Mineralogist' _journal_volume 72 _journal_year 1987 _journal_page_first 959 _journal_page_last 964 _publ_section_title ; Characterization of cation ordering in synthetic scandium-fluor-eckermannite, indium-fluor-eckermannite, and scandium-fluor-nyboite by Rietveld structure refinement Sample: FInEC-A3 ; _database_code_amcsd 0001116 _chemical_formula_sum 'O22 F2 Si8 Mg4.038 In.962 Na3' _cell_length_a 9.8527 _cell_length_b 18.0966 _cell_length_c 5.2928 _cell_angle_alpha 90 _cell_angle_beta 103.521 _cell_angle_gamma 90 _cell_volume 917.553 _exptl_crystal_density_diffrn 3.229 _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 _atom_site_occupancy _atom_site_U_iso_or_equiv O1 0.11880 0.08440 0.22200 1.00000 0.01013 O2 0.11640 0.16570 0.72100 1.00000 0.01013 F3 0.10600 0.00000 0.71600 1.00000 0.01013 O4 0.35750 0.24530 0.78900 1.00000 0.01013 O5 0.35480 0.12610 0.08300 1.00000 0.01393 O6 0.34390 0.11730 0.58600 1.00000 0.01393 O7 0.34700 0.00000 0.29200 1.00000 0.01520 Si1 0.28480 0.08400 0.29050 1.00000 0.00507 Si2 0.28800 0.16780 0.79570 1.00000 0.00507 Mg1 0.00000 0.08460 0.50000 1.00000 0.00760 Mg2 0.00000 0.18220 0.00000 0.51900 0.00760 In2 0.00000 0.18220 0.00000 0.48100 0.00760 Mg3 0.00000 0.00000 0.00000 1.00000 0.00760 Na4 0.00000 0.27590 0.50000 1.00000 0.01140 NaA 0.02900 0.50000 0.07700 0.50000 0.02913