data_global _chemical_name_mineral 'Kratochvilite' loop_ _publ_author_name 'Burns D M' 'Iball J' _journal_name_full 'Proceedings of the Royal Society of London' _journal_volume A227 _journal_year 1955 _journal_page_first 200 _journal_page_last 214 _publ_section_title ; The crystal and molecular structure of fluorene Note: Positions of hydrogen atoms were not given ; _database_code_amcsd 0018397 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'C13' _cell_length_a 8.49 _cell_length_b 5.721 _cell_length_c 18.97 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 921.397 _exptl_crystal_density_diffrn 1.126 _symmetry_space_group_name_H-M 'P n a 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 C1 0.64200 0.56600 0.21100 C2 0.57300 0.72400 0.16300 C3 0.59300 0.67600 0.09100 C4 0.67900 0.48400 0.06800 C5 0.75000 0.33500 0.11400 C6 0.73300 0.37300 0.18900 C7 0.79600 0.25000 0.25000