data_global
_chemical_name_mineral 'Forsterite'
loop_
_publ_author_name
'Hazen R M'
_journal_name_full 'American Mineralogist'
_journal_volume 61 
_journal_year 1976
_journal_page_first 1280
_journal_page_last 1293
_publ_section_title
;
 Effects of temperature and pressure on the crystal structure of forsterite
 T = 23 C P = 50 kb
 olivine
;
_database_code_amcsd 0000552
_chemical_formula_sum 'Si Mg2 O4'
_cell_length_a 4.712
_cell_length_b 9.97
_cell_length_c 5.955
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 279.758
_exptl_crystal_density_diffrn      3.340
_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
Si   0.42800   0.10100   0.25000   0.00887
Mg1   0.00000   0.00000   0.00000   0.00253
Mg2   0.99300   0.28300   0.25000   0.00760
O1   0.77600   0.10300   0.25000   0.00127
O2   0.22800   0.44000   0.25000   0.00507
O3   0.28100   0.15300   0.03200   0.00760