data_global _chemical_name_mineral 'Barberiite' loop_ _publ_author_name 'Hoard J' 'Blair V' _journal_name_full 'Journal of the American Chemical Society' _journal_volume 57 _journal_year 1935 _journal_page_first 1985 _journal_page_last 1988 _publ_section_title ; The crystal structures of rubidium and ammonium fluoborates _cod_database_code 1011135 ; _database_code_amcsd 0018024 _chemical_formula_sum 'N B F4' _cell_length_a 9.06 _cell_length_b 5.64 _cell_length_c 7.23 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 369.441 _exptl_crystal_density_diffrn 1.812 _symmetry_space_group_name_H-M 'P n m a' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,z' '-x,1/2+y,-z' '1/2-x,1/2+y,1/2+z' '1/2+x,1/2-y,1/2-z' '1/2+x,y,1/2-z' '1/2-x,-y,1/2+z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z NH4 0.30800 0.25000 0.32800 B1 0.94700 0.25000 0.69700 F1 0.08600 0.25000 0.60300 F2 0.83000 0.25000 0.56300 F3 0.93600 0.04300 0.81100