data_global
_chemical_name_mineral 'Forsterite'
loop_
_publ_author_name
'Ottonello G'
'Della Giusta A'
'Molin G M'
_journal_name_full 'American Mineralogist'
_journal_volume 74 
_journal_year 1989
_journal_page_first 411
_journal_page_last 421
_publ_section_title
;
 Cation ordering in Ni-Mg olivines
 sample Ni.30B, heated at 1150 C, then quenched
 Mg1.4Ni.6SiO4
;
_database_code_amcsd 0001217
_chemical_formula_sum '(Ni.616 Mg1.384) Si O4'
_cell_length_a 4.7453
_cell_length_b 10.1926
_cell_length_c 5.9559
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 288.069
_exptl_crystal_density_diffrn      3.732
_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
Ni1   0.00000   0.00000   0.00000   0.49500   0.00633
Mg1   0.00000   0.00000   0.00000   0.50500   0.00633
Ni2   0.99080   0.27600   0.25000   0.12100   0.00709
Mg2   0.99080   0.27600   0.25000   0.87900   0.00709
Si   0.42570   0.09360   0.25000   1.00000   0.00545
O1   0.76730   0.09240   0.25000   1.00000   0.00697
O2   0.21980   0.44630   0.25000   1.00000   0.00671
O3   0.27670   0.16280   0.03240   1.00000   0.00709