data_global
_chemical_name_mineral 'Forsterite'
loop_
_publ_author_name
'Smyth J R'
'Hazen R M'
_journal_name_full 'American Mineralogist'
_journal_volume 58 
_journal_year 1973
_journal_page_first 588
_journal_page_last 593
_publ_section_title
;
 The crystal structures of forsterite and hortonolite at several temperatures
 up to 900 C
 T = 25 C
;
_database_code_amcsd 0000328
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Mg2 Si O4'
_cell_length_a 4.756
_cell_length_b 10.207
_cell_length_c 5.980
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 290.296
_exptl_crystal_density_diffrn      3.219
_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   0.00329
Mg2   0.99150   0.27740   0.25000   0.00279
Si   0.42620   0.09400   0.25000   0.00101
O1   0.76570   0.09130   0.25000   0.00342
O2   0.22150   0.44740   0.25000   0.00304
O3   0.27770   0.16280   0.03310   0.00342