data_9001790
_chemical_name 'Liebenbergite'
loop_
_publ_author_name
'Chen J'
'Li R'
'Parise J B'
'Weidner D J'
_journal_name_full "American Mineralogist"
_journal_volume 81
_journal_year 1996
_journal_page_first 1519
_journal_page_last 1522
_publ_section_title
;
 Pressure-induced ordering in (Ni,Mg)2SiO4 olivine
 Sample: Room pressure, 23 C, (800 C quenched)
;
_chemical_formula_sum '(Ni Mg) Si O4'
_cell_length_a 4.7362
_cell_length_b 10.1682
_cell_length_c 5.9401
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 286.067
_symmetry_space_group_name_H-M 'P b n m'
loop_
_symmetry_equiv_pos_as_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_Uiso_or_equiv
Ni1   0.00000   0.00000   0.00000   0.74200   0.01500
Mg1   0.00000   0.00000   0.00000   0.25800   0.01500
Ni2   0.98980   0.27520   0.25000   0.25800   0.01500
Mg2   0.98980   0.27520   0.25000   0.74200   0.01500
Si   0.42560   0.09320   0.25000   1.00000   0.01700
O1   0.77190   0.09160   0.25000   1.00000   0.00900
O2   0.22080   0.44470   0.25000   1.00000   0.00900
O3   0.27680   0.16400   0.03190   1.00000   0.00900