data_global
_chemical_name_mineral 'Forsterite'
loop_
_publ_author_name
'Henderson C M B'
'Redfern S A T'
'Smith R I'
'Knight K S'
'Charnock J M'
_journal_name_full 'American Mineralogist'
_journal_volume 86 
_journal_year 2001
_journal_page_first 1170
_journal_page_last 1187
_publ_section_title
;
 Composition and temperature dependence of cation ordering in Ni-Mg olivine solid solutions:
 A time-of-flight neutron powder diffraction and EXAFS study
 Sample: Mg50Ni50 at T = 700 C
;
_database_code_amcsd 0002689
_chemical_formula_sum '(Ni Mg) Si O4'
_cell_length_a 4.76809
_cell_length_b 10.2754
_cell_length_c 5.99411
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 293.676
_exptl_crystal_density_diffrn      3.960
_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   0.74600   0.01292
Mg1   0.00000   0.00000   0.00000   0.25400   0.01292
Ni2   0.99030   0.27680   0.25000   0.25400   0.01381
Mg2   0.99030   0.27680   0.25000   0.74600   0.01381
Si   0.42520   0.09290   0.25000   1.00000   0.00874
O1   0.76700   0.09360   0.25000   1.00000   0.01368
O2   0.22160   0.44690   0.25000   1.00000   0.01292
O3   0.27590   0.16180   0.03280   1.00000   0.01330