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 = 1 atm
 olivine
;
_database_code_amcsd 0000546
_chemical_formula_sum 'Si Mg2 O4'
_cell_length_a 4.752
_cell_length_b 10.193
_cell_length_c 5.977
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 289.509
_exptl_crystal_density_diffrn      3.228
_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   0.42620   0.09400   0.25000
Mg1   0.00000   0.00000   0.00000
Mg2   0.99150   0.27740   0.25000
O1   0.76570   0.09130   0.25000
O2   0.22150   0.44740   0.25000
O3   0.27770   0.16280   0.03310
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 0.00092 0.00226 0.00145 0.00012 0.00000 0.00000
Mg1 0.00275 0.00537 0.00181 0.00025 -0.00043 -0.00093
Mg2 0.00252 0.00316 0.00290 0.00000 0.00000 0.00000
O1 0.00103 0.00474 0.00416 0.00049 0.00000 0.00000
O2 0.00275 0.00368 0.00398 0.00025 0.00000 0.00000
O3 0.00252 0.00490 0.00290 0.00025 -0.00043 0.00123