data_global
_chemical_name_mineral 'Forsterite'
loop_
_publ_author_name
'Hazen R M'
_journal_name_full 'American Mineralogist'
_journal_volume 61 
_journal_year 1976
_journal_page_first 1280
_journal_page_last 1293
_publ_section_title
;
 Effects of temperature and pressure on the crystal structure of forsterite
 T = 1000 C P = 1 atm
 olivine
;
_database_code_amcsd 0000549
_chemical_formula_sum 'Si Mg2 O4'
_cell_length_a 4.795
_cell_length_b 10.36
_cell_length_c 6.06
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 301.038
_exptl_crystal_density_diffrn      3.104
_symmetry_space_group_name_H-M 'P b n m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,y,1/2-z'
  '-x,-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,z'
  '1/2+x,1/2-y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Si   0.42630   0.09430   0.25000
Mg1   0.00000   0.00000   0.00000
Mg2   0.99240   0.27720   0.25000
O1   0.76310   0.09140   0.25000
O2   0.21780   0.44970   0.25000
O3   0.28430   0.16290   0.03590
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
Si 0.00792 0.01468 0.01433 0.00101 0.00000 0.00000
Mg1 0.01794 0.03208 0.01712 -0.00101 -0.00250 -0.00541
Mg2 0.02132 0.02066 0.02270 0.00126 0.00000 0.00000
O1 0.01374 0.02338 0.02009 0.01158 0.00000 0.00000
O2 0.01572 0.01740 0.01972 0.00000 0.00000 0.00000
O3 0.01899 0.02447 0.01916 -0.00075 -0.00074 0.00604