data_global
_chemical_name_mineral 'Andalusite'
loop_
_publ_author_name
'Winter J K'
'Ghose S'
_journal_name_full 'American Mineralogist'
_journal_volume 64 
_journal_year 1979
_journal_page_first 573
_journal_page_last 586
_publ_section_title
;
 Thermal expansion and high-temperature crystal chemistry of the Al2SiO5 polymorphs
 T = 25 deg C
;
_database_code_amcsd 0000728
_chemical_formula_sum 'Al2 Si O5'
_cell_length_a 7.7980
_cell_length_b 7.9031
_cell_length_c 5.5566
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 342.444
_exptl_crystal_density_diffrn      3.143
_symmetry_space_group_name_H-M 'P n n m'
loop_
_space_group_symop_operation_xyz
  'x,y,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,1/2+z'
  '1/2+x,1/2-y,1/2-z'
  'x,y,-z'
  '-x,-y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Al1   0.00000   0.00000   0.24190
Al2   0.37050   0.13910   0.50000
Si   0.24600   0.25200   0.00000
Oa   0.42460   0.36290   0.00000
Ob   0.10300   0.40030   0.00000
Oc   0.42330   0.36290   0.50000
Od   0.23050   0.13390   0.23940
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
Al1 0.00647 0.00918 0.00360 0.00156 0.00000 0.00000
Al2 0.00277 0.00823 0.00438 0.00000 0.00000 0.00000
Si 0.00216 0.00759 0.00391 0.00000 0.00000 0.00000
Oa 0.00339 0.00981 0.00485 -0.00187 0.00000 0.00000
Ob 0.00308 0.00854 0.01345 0.00062 0.00000 0.00000
Oc 0.00555 0.00886 0.00469 -0.00094 0.00000 0.00000
Od 0.00493 0.01013 0.00469 -0.00125 -0.00088 0.00111