data_global
_chemical_name_mineral 'Forsterite'
loop_
_publ_author_name
'Kudoh Y'
'Takeuchi Y'
_journal_name_full 'Zeitschrift fur Kristallographie'
_journal_volume 171 
_journal_year 1985
_journal_page_first 291
_journal_page_last 302
_publ_section_title
;
 The crystal structure of forsterite Mg2SiO4 under high pressure up to 149 kb
 Sample: P = 53 kbar
;
_database_code_amcsd 0010930
_chemical_formula_sum 'Mg2 Si O4'
_cell_length_a 4.709
_cell_length_b 10.010
_cell_length_c 5.896
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 277.920
_exptl_crystal_density_diffrn      3.362
_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
_atom_site_U_iso_or_equiv
Mg1   0.00000   0.00000   0.00000   0.00228
Mg2   0.99130   0.27730   0.25000   0.00253
Si   0.42680   0.09410   0.25000   0.00076
O1   0.76600   0.09150   0.25000   0.00304
O2   0.22090   0.44760   0.25000   0.00228
O3   0.27660   0.16280   0.03190   0.00317