data_global _chemical_name_mineral 'Goethite' loop_ _publ_author_name 'Hoppe W' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 103 _journal_year 1940 _journal_page_first 73 _journal_page_last 89 _publ_section_title ; Uber die kristallstruktur von alpha-AlOOH (diaspore) und alpha-Fe OOH(nadeleisenerz) ; _database_code_amcsd 0010571 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Fe O2' _cell_length_a 4.59 _cell_length_b 10.0 _cell_length_c 3.03 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 139.077 _exptl_crystal_density_diffrn 4.195 _symmetry_space_group_name_H-M 'P b n m' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,y,1/2-z' '-x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '1/2-x,1/2+y,1/2-z' '1/2-x,1/2+y,z' '1/2+x,1/2-y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Fe -0.04500 0.14600 0.25000 O1 0.31000 -0.20000 0.25000 O2 -0.20000 -0.04700 0.25000