data_global _chemical_name_mineral 'Chrysoberyl' loop_ _publ_author_name 'Hazen R M' _journal_name_full 'Physics and Chemistry of Minerals' _journal_volume 14 _journal_year 1987 _journal_page_first 13 _journal_page_last 20 _publ_section_title ; High-pressure crystal chemistry of chrysoberyl, Al2BeO4: insights on the origin of olivine elastic anisotropy Sample: P = 1.4 GPa ; _database_code_amcsd 0007429 _chemical_formula_sum 'Al2 Be O4' _cell_length_a 4.421 _cell_length_b 9.399 _cell_length_c 5.471 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 227.336 _exptl_crystal_density_diffrn 3.710 _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 0.01229 Al2 0.99390 0.27330 0.25000 0.00925 Be 0.42950 0.08880 0.25000 0.00760 O1 0.79040 0.08940 0.25000 0.01115 O2 0.24210 0.43530 0.25000 0.01469 O3 0.25240 0.16170 0.01620 0.01368