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 = 149 kbar
;
_database_code_amcsd 0010934
_chemical_formula_sum 'Mg2 Si O4'
_cell_length_a 4.651
_cell_length_b 9.770
_cell_length_c 5.744
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 261.009
_exptl_crystal_density_diffrn      3.580
_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
Mg   0.00000   0.00000   0.00000 ?
Mg   0.99150   0.27680   0.25000   0.00253
Si   0.42880   0.09580   0.25000 ?
O1   0.75740   0.08340   0.25000 ?
O2   0.20560   0.44990   0.25000   0.00380
O3   0.27370   0.17080   0.04130   0.00760