data_global
_amcsd_formula_title 'Li.8Al.8Si1.2O4'
loop_
_publ_author_name
'Xu H'
'Heaney P J'
'Beall G H'
_journal_name_full 'American Mineralogist'
_journal_volume 85 
_journal_year 2000
_journal_page_first 971
_journal_page_last 979
_publ_section_title
;
 Phase transitions induced by solid solution in stuffed derivatives of quartz:
 A powder synchrotron XRD study of the LiAlSiO4-SiO2 join
 Sample: x=.2, Li.8Al.8Si1.2O4, beta eucryptite structure
;
_database_code_amcsd 0002463
_chemical_formula_sum 'Li Si Al O4'
_cell_length_a 10.4949
_cell_length_b 10.4949
_cell_length_c 10.9650
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 1045.914
_exptl_crystal_density_diffrn      2.401
_symmetry_space_group_name_H-M 'P 62 2 2'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,x-y,1/3-z'
  'x-y,x,1/3+z'
  'y,x,2/3-z'
  '-y,x-y,2/3+z'
  '-x+y,y,-z'
  '-x,-y,z'
  '-x,-x+y,1/3-z'
  '-x+y,-x,1/3+z'
  '-y,-x,2/3-z'
  'y,-x+y,2/3+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
Li1   0.00000   0.00000   0.50000   0.02500
Li2   0.50000   0.00000   0.00000   0.02500
Li3   0.50000   0.00000   0.31600   0.02500
Si1   0.25040   0.00000   0.00000   0.00790
Si2   0.25010   0.50020   0.00000   0.00790
Al1   0.24900   0.00000   0.50000   0.00790
Al2   0.25030   0.50060   0.50000   0.00790
O1   0.10780   0.20610   0.24380   0.01340
O2   0.09870   0.69660   0.25630   0.01340
O3   0.59130   0.70100   0.27790   0.01340
O4   0.59980   0.20240   0.24940   0.01340