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 = 1050 C
;
_database_code_amcsd 0008470
_chemical_formula_sum '(Fe Mg) Si O4'
_cell_length_a 4.8426
_cell_length_b 10.4810
_cell_length_c 6.1284
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 311.049
_exptl_crystal_density_diffrn      3.678
_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   0.44900   0.01770
MgM1   0.00000   0.00000   0.00000   0.55100   0.01770
FeM2   0.97980   0.28150   0.25000   0.55100   0.02670
MgM2   0.97980   0.28150   0.25000   0.44900   0.02670
Si   0.42050   0.09580   0.25000   1.00000   0.01650
O1   0.76770   0.09530   0.25000   1.00000   0.02300
O2   0.22110   0.45370   0.25000   1.00000   0.02600
O3   0.28610   0.16500   0.03870   1.00000   0.02120