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 = 490 C ; _database_code_amcsd 0007445 _chemical_formula_sum 'Al2 Be O4' _cell_length_a 4.438 _cell_length_b 9.429 _cell_length_c 5.492 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 229.818 _exptl_crystal_density_diffrn 3.670 _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 0.00684 Al2 0.99500 0.27332 0.25000 0.00545 Be 0.43530 0.09290 0.25000 0.01064 O1 0.78830 0.09040 0.25000 0.00722 O2 0.24240 0.43300 0.25000 0.00747 O3 0.25760 0.16280 0.01560 0.00773