data_global
_chemical_name_mineral 'Eucryptite'
loop_
_publ_author_name
'Pillars W W'
'Peacor D R'
_journal_name_full 'American Mineralogist'
_journal_volume 58 
_journal_year 1973
_journal_page_first 681
_journal_page_last 690
_publ_section_title
;
 The crystal structure of beta eucryptite as a function of temperature
 T = 23C
;
_database_code_amcsd 0000376
_chemical_formula_sum 'Si Al Li O4'
_cell_length_a 10.497
_cell_length_b 10.497
_cell_length_c 11.200
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 1068.757
_exptl_crystal_density_diffrn      2.349
_symmetry_space_group_name_H-M 'P 64 2 2'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,x-y,2/3-z'
  'x-y,x,2/3+z'
  'y,x,1/3-z'
  '-y,x-y,1/3+z'
  '-x+y,y,-z'
  '-x,-y,z'
  '-x,-x+y,2/3-z'
  '-x+y,-x,2/3+z'
  '-y,-x,1/3-z'
  'y,-x+y,1/3+z'
  'x-y,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Si1   0.24860   0.00000   0.00000   0.00304
Si2   0.24770   0.49540   0.00000   0.00431
Al1   0.25200   0.00000   0.50000   0.00266
Al2   0.25060   0.50120   0.50000   0.00304
Li1   0.00000   0.00000   0.50000   0.03800
Li2   0.50000   0.00000   0.00000   0.04559
Li3   0.50000   0.00000   0.32400   0.01013
O1   0.08530   0.19420   0.24280   0.00557
O2   0.60230   0.70080   0.26510   0.00671
O3   0.11010   0.70990   0.25970   0.01343
O4   0.59020   0.20110   0.24940   0.00836