data_global
_chemical_name_mineral 'Forsterite'
loop_
_publ_author_name
'Baur W H'
_journal_name_full 'American Mineralogist'
_journal_volume 57
_journal_year 1972
_journal_page_first 709
_journal_page_last 731
_publ_section_title
;
 Computer-simulated crystal structures of observed and hypothetical Mg2SiO4
 polymorphs of low and high density
;
_database_code_amcsd 276
_chemical_compound_source 'hypothetical'
_chemical_formula_sum 'Si Mg2 O4'
_cell_length_a 4.79
_cell_length_b 10.19
_cell_length_c 5.85
_cell_angle_alpha 90.0
_cell_angle_beta 90.0
_cell_angle_gamma 90.0
_cell_volume 285.539
_exptl_crystal_density_diffrn  3.273
_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   0.0945  0.4078  0.25
Mg1   0.0  0.0  0.0
Mg2   0.0056  0.2632  0.75
O1   0.2499  0.0907  0.75
O2   0.2832  0.0578  0.25
O3   0.2312  0.337  0.4707