data_global
_chemical_name_mineral 'Liebenbergite'
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.75, heated to 1150 C, then quenched
 Mg.505Ni1.492SiO4
;
_database_code_amcsd 0001228
_chemical_formula_sum '(Ni1.46 Mg.54) Si O4'
_cell_length_a 4.7350
_cell_length_b 10.1526
_cell_length_c 5.9278
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 284.965
_exptl_crystal_density_diffrn      4.450
_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   0.87000   0.00545
Mg1   0.00000   0.00000   0.00000   0.13000   0.00545
Ni2   0.99180   0.27450   0.25000   0.59000   0.00570
Mg2   0.99180   0.27450   0.25000   0.41000   0.00570
Si   0.42670   0.09380   0.25000   1.00000   0.00583
O1   0.76840   0.09290   0.25000   1.00000   0.00595
O2   0.21980   0.44490   0.25000   1.00000   0.00722
O3   0.27500   0.16300   0.03190   1.00000   0.00659