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 = 350 C P = 1 atm
 olivine
;
_database_code_amcsd 0000547
_chemical_formula_sum 'Si Mg2 O4'
_cell_length_a 4.763
_cell_length_b 10.24
_cell_length_c 5.999
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 292.590
_exptl_crystal_density_diffrn      3.194
_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   0.42570   0.09390   0.25000
Mg1   0.00000   0.00000   0.00000
Mg2   0.99150   0.27800   0.25000
O1   0.76570   0.09100   0.25000
O2   0.21780   0.44920   0.25000
O3   0.28220   0.16190   0.03470
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Si 0.00299 0.00531 0.00456 0.00025 0.00000 0.00000
Mg1 0.00862 0.01116 0.00529 -0.00025 -0.00072 -0.00218
Mg2 0.00931 0.00744 0.00820 0.00012 0.00000 0.00000
O1 0.01080 0.00637 0.00930 0.00074 0.00000 0.00000
O2 0.00839 0.00744 0.00729 -0.00025 0.00000 0.00000
O3 0.00942 0.00850 0.00675 -0.00074 -0.00029 0.00187