data_global
_chemical_name_mineral 'Forsterite'
loop_
_publ_author_name
'Fujino K'
'Sasaki S'
'Takeuchi Y'
'Sadanaga R'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 37 
_journal_year 1981
_journal_page_first 513
_journal_page_last 518
_publ_section_title
;
 X-ray determination of electron distributions in forsterite, fayalite and tephroite
;
_database_code_amcsd 0019694
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Mg2 Si O4'
_cell_length_a 4.7534
_cell_length_b 10.1902
_cell_length_c 5.9783
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 289.577
_exptl_crystal_density_diffrn      3.227
_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   0.00566
Mg2   0.99169   0.27739   0.25000   0.00560
Si   0.42645   0.09403   0.25000   0.00385
O1   0.76594   0.09156   0.25000   0.00508
O2   0.22164   0.44705   0.25000   0.00510
O3   0.27751   0.16310   0.03304   0.00551