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 = 5.4 GPa
;
_database_code_amcsd 0007432
_chemical_formula_sum 'Al2 Be O4'
_cell_length_a 4.400
_cell_length_b 9.343
_cell_length_c 5.442
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 223.716
_exptl_crystal_density_diffrn      3.770
_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   0.00950
Al2   0.99400   0.27200   0.25000   0.00722
Be   0.43320   0.08950   0.25000   0.00887
O1   0.79240   0.09340   0.25000   0.01494
O2   0.24610   0.43210   0.25000   0.02178
O3   0.25380   0.16290   0.01470   0.00646