data_global _chemical_name_mineral 'Chrysoberyl' loop_ _publ_author_name 'Hazen R M' 'Finger L W' _journal_name_full 'Physics and Chemistry of Minerals' _journal_volume 14 _journal_year 1987 _journal_page_first 426 _journal_page_last 434 _publ_section_title ; High-temperature crystal chemistry of phenakite (Be2SiO4) and Chrysoberyl (BeAl2O4) Sample: T = 25 C ; _database_code_amcsd 0007443 _chemical_formula_sum 'Al2 Be O4' _cell_length_a 4.424 _cell_length_b 9.396 _cell_length_c 5.471 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 227.418 _exptl_crystal_density_diffrn 3.708 _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 _atom_site_U_iso_or_equiv Al1 0.00000 0.00000 0.00000 0.00405 Al2 0.99490 0.27306 0.25000 0.00253 Be 0.43330 0.09290 0.25000 0.00557 O1 0.78740 0.09010 0.25000 0.00443 O2 0.24220 0.43300 0.25000 0.00456 O3 0.25680 0.16310 0.01540 0.00481