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 = 86 kbar
;
_database_code_amcsd 0010932
_chemical_formula_sum 'Mg2 Si O4'
_cell_length_a 4.685
_cell_length_b 9.913
_cell_length_c 5.845
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 271.456
_exptl_crystal_density_diffrn      3.443
_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   0.00507
Mg2   0.99030   0.27680   0.25000   0.00228
Si   0.42780   0.09450   0.25000   0.00013
O1   0.76800   0.09130   0.25000   0.00266
O2   0.21890   0.44760   0.25000   0.00570
O3   0.27710   0.16460   0.03360   0.00063