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 = 3.15 GPa
;
_database_code_amcsd 0007430
_chemical_formula_sum 'Al2 Be O4'
_cell_length_a 4.413
_cell_length_b 9.373
_cell_length_c 5.458
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 225.760
_exptl_crystal_density_diffrn      3.736
_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   0.00988
Al2   0.99470   0.27320   0.25000   0.00912
Be   0.42910   0.09350   0.25000   0.00380
O1   0.78550   0.08830   0.25000   0.01013
O2   0.24080   0.43460   0.25000   0.01089
O3   0.25520   0.16220   0.01450   0.01570