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 = 270 C
;
_database_code_amcsd 0007444
_chemical_formula_sum 'Al2 Be O4'
_cell_length_a 4.4275
_cell_length_b 9.4063
_cell_length_c 5.477
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 228.097
_exptl_crystal_density_diffrn      3.697
_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   0.00583
Al2   0.99500   0.27323   0.25000   0.00418
Be   0.43400   0.09250   0.25000   0.00773
O1   0.78800   0.09000   0.25000   0.00583
O2   0.24230   0.43340   0.25000   0.00621
O3   0.25700   0.16320   0.01540   0.00659