data_global
_chemical_name_mineral 'Olivine'
loop_
_publ_author_name
'Muller-Sommer M'
'Hock R'
'Kirfel A'
_journal_name_full 'Physics and Chemistry of Minerals'
_journal_volume 24 
_journal_year 1997
_journal_page_first 17
_journal_page_last 23
_publ_section_title
;
 Rietveld refinement study of the cation distribution in (Co, Mg)-olivine
 solid solution
 Sample: M13
;
_database_code_amcsd 0007973
_chemical_formula_sum '(Co1.75 Mg.25) Si O4'
_cell_length_a 4.7814
_cell_length_b 10.2924
_cell_length_c 6.0007
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 295.307
_exptl_crystal_density_diffrn      4.528
_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
CoM1   0.00000   0.00000   0.00000   0.93400   0.00659
MgM1   0.00000   0.00000   0.00000   0.06600   0.00659
CoM2   0.98910   0.27670   0.25000   0.81600   0.00519
MgM2   0.98910   0.27670   0.25000   0.18400   0.00519
Si   0.43180   0.09490   0.25000   1.00000   0.00431
O1   0.75340   0.08730   0.25000   1.00000   0.00595
O2   0.22230   0.45000   0.25000   1.00000   0.00595
O3   0.29290   0.16410   0.03840   1.00000   0.00646