data_global
_chemical_name_mineral 'Forsterite'
loop_
_publ_author_name
'Redfern S A T'
'Artioli G'
'Rinaldi R'
'Henderson C M B'
'Knight K S'
'Wood B J'
_journal_name_full 'Physics and Chemistry of Minerals'
_journal_volume 27 
_journal_year 2000
_journal_page_first 630
_journal_page_last 637
_publ_section_title
;
 Octahedral cation ordering in olivine at high temperature. II: an in situ
 neutron powder diffraction study on synthetic MgFeSiO4 (Fa50)
 Sample: T = 100 C
;
_database_code_amcsd 0008457
_chemical_formula_sum '(Fe Mg) Si O4'
_cell_length_a 4.8025
_cell_length_b 10.3648
_cell_length_c 6.0529
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 301.295
_exptl_crystal_density_diffrn      3.797
_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_occupancy
_atom_site_U_iso_or_equiv
FeM1   0.00000   0.00000   0.00000   0.53700   0.00793
MgM1   0.00000   0.00000   0.00000   0.46300   0.00793
FeM2   0.99190   0.27870   0.25000   0.46300   0.00532
MgM2   0.99190   0.27870   0.25000   0.53700   0.00532
Si   0.42530   0.09770   0.25000   1.00000   0.00247
O1   0.76830   0.09150   0.25000   1.00000   0.01124
O2   0.21720   0.45100   0.25000   1.00000   0.00681
O3   0.28260   0.16410   0.03480   1.00000   0.00738