data_global _chemical_name_mineral 'Boron' loop_ _publ_author_name 'Hoard J L' 'Geller S' 'Hughes R E' _journal_name_full 'Journal of the American Chemical Society' _journal_volume 73 _journal_year 1951 _journal_page_first 1892 _journal_page_last 1893 _publ_section_title ; On the structure of elementary boron ; _database_code_amcsd 0014080 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'B13' _cell_length_a 8.73 _cell_length_b 8.73 _cell_length_c 5.03 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 383.351 _exptl_crystal_density_diffrn 2.435 _symmetry_space_group_name_H-M 'P -4 n 2' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+y,1/2+x,1/2-z' 'y,-x,-z' '1/2+x,1/2-y,1/2+z' '-x,-y,z' '1/2-y,1/2-x,1/2-z' '-y,x,-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 B1 0.00000 0.00000 0.50000 B2 0.50000 0.50000 0.00000 B3 0.32800 0.09500 0.39500 B4 0.09500 0.32800 0.39500 B5 0.22300 0.07800 0.10500 B6 0.07800 0.22300 0.10500 B7 0.12700 0.12700 0.39500 B8 0.25000 0.25000 -0.07800