data_9008140
_chemical_name 'Spodumene-II'
loop_
_publ_author_name
'Li C T'
'Peacor D R'
_journal_name_full "Zeitschrift fur Kristallographie"
_journal_volume 126
_journal_year 1968
_journal_page_first 46
_journal_page_last 65
_publ_section_title
;
 The crystal structure LiAlSi2O6-II ("beta spodumene")
 Locality: synthetic
 Note, y coordinate of Si1 altered according to Clarke and Spink (1969)
;
_chemical_formula_sum 'Li (Al Si2) O6'
_cell_length_a 7.541
_cell_length_b 7.541
_cell_length_c 9.156
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 520.671
_symmetry_space_group_name_H-M 'P 43 21 2'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  'y,x,-z'
  '1/2-y,1/2+x,3/4+z'
  '1/2-x,1/2+y,3/4-z'
  '-x,-y,1/2+z'
  '-y,-x,1/2-z'
  '1/2+y,1/2-x,1/4+z'
  '1/2+x,1/2-y,1/4-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_Uiso_or_equiv
Li   0.07050   0.19530   0.50110   0.50000   0.05395
Al1   0.33230   0.12210   0.23840   0.33333   0.00241
Si1   0.33230   0.12210   0.23840   0.66667   0.00241
Al2   0.41780   0.41780   0.00000   0.33333   0.00279
Si2   0.41780   0.41780   0.00000   0.66667   0.00279
O1   0.44320   0.12070   0.39310   1.00000   0.02381
O2   0.12450   0.11590   0.29940   1.00000   0.01355
O3   0.36370   0.30460   0.14590   1.00000   0.02964