data_global _amcsd_formula_title 'Fe7SiO10' loop_ _publ_author_name 'Van Aken P A' 'Miehe G' 'Woodland A B' 'Angel R J' _journal_name_full 'European Journal of Mineralogy' _journal_volume 17 _journal_year 2005 _journal_page_first 723 _journal_page_last 731 _publ_section_title ; Crystal structure and cation distribution in Fe7SiO10 ("Iscorite") ; _database_code_amcsd 0007130 _chemical_formula_sum 'Fe3.5 Si.5 O5' _cell_length_a 21.336 _cell_length_b 3.0679 _cell_length_c 5.8744 _cell_angle_alpha 90 _cell_angle_beta 98.06 _cell_angle_gamma 90 _cell_volume 380.721 _exptl_crystal_density_diffrn 5.051 _symmetry_space_group_name_H-M 'I 1 2/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,1/2+z' 'x,-y,z' '1/2+x,1/2-y,1/2+z' '-x,y,-z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' '1/2-x,1/2-y,1/2-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy Fe2+M1 0.30540 0.00000 0.39320 1.00000 Fe2+M2 0.30310 0.00000 0.91000 1.00000 Fe2+M3 0.08730 0.00000 0.79010 0.50000 Fe3+M3 0.08730 0.00000 0.79010 0.50000 Fe3+T 0.44570 0.00000 0.22460 0.50000 SiT 0.44570 0.00000 0.22460 0.50000 O1 0.20230 0.00000 0.84840 1.00000 O2 0.20860 0.00000 0.35880 1.00000 O3 0.39850 0.00000 0.45530 1.00000 O4 0.40190 0.00000 0.94320 1.00000 O5 0.01410 0.00000 0.24740 1.00000