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 1300 C, then quenched
 Mg1.4Ni.6SiO4
;
_database_code_amcsd 0001218
_chemical_formula_sum '(Ni.617 Mg1.383) Si O4'
_cell_length_a 4.7452
_cell_length_b 10.1909
_cell_length_c 5.9583
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 288.131
_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   0.47800   0.00773
Mg1   0.00000   0.00000   0.00000   0.52200   0.00773
Ni2   0.99090   0.27600   0.25000   0.13900   0.00849
Mg2   0.99090   0.27600   0.25000   0.86100   0.00849
Si   0.42620   0.09360   0.25000   1.00000   0.00684
O1   0.76660   0.09240   0.25000   1.00000   0.00709
O2   0.21990   0.44630   0.25000   1.00000   0.00747
O3   0.27650   0.16270   0.03220   1.00000   0.00823