#------------------------------------------------------------------------------
#$Date: 2009-11-18 16:56:34 +0200 (Wed, 18 Nov 2009) $
#$Revision: 858 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/9008140.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/
#
# All data on this site have been placed in the public domain by the
# contributors.
#
data_9008140
loop_
_publ_author_name
'Li C T'
'Peacor D R'
_publ_section_title
;
 The crystal structure LiAlSi2O6-II ("beta spodumene")
 Locality: synthetic
 Note, y coordinate of Si1 altered according to Clarke and Spink (1969)
;
_journal_name_full               'Zeitschrift fur Kristallographie'
_journal_page_first              46
_journal_page_last               65
_journal_volume                  126
_journal_year                    1968
_chemical_formula_sum            'Al Li O6 Si2'
_[local]_cod_chemical_formula_sum_orig 'Li (Al Si2) O6'
_chemical_name_mineral           Spodumene-II
_symmetry_space_group_name_H-M   'P 43 21 2'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_length_a                   7.541
_cell_length_b                   7.541
_cell_length_c                   9.156
_cell_volume                     520.671
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_U_iso_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
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Li 0.05618 0.07058 0.03525 -0.03745 0.02309 -0.03183
Al1 0.00346 0.00375 0.00000 0.00029 0.00070 -0.00105
Si1 0.00346 0.00375 0.00000 0.00029 0.00070 -0.00105
Al2 0.00317 0.00317 0.00212 -0.00086 -0.00175 0.00175
Si2 0.00317 0.00317 0.00212 -0.00086 -0.00175 0.00175
O1 0.02939 0.02622 0.01571 -0.00634 -0.01539 0.00280
O2 0.00893 0.02305 0.00849 0.00173 0.00000 -0.00210
O3 0.03716 0.02305 0.02888 0.00173 0.01154 0.01154