data_global
_amcsd_formula_title 'MgMnSiO4'
loop_
_publ_author_name
'Redfern S A T'
'Henderson C M B'
'Knight K S'
'Wood B J'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 9 
_journal_year 1997
_journal_page_first 287
_journal_page_last 300
_publ_section_title
;
 High-temperature order-disorder in (Fe0.5Mn0.5)2SiO4 and (Mg0.5Mn0.5)2SiO4
 olivines: an in situ neutron diffraction study
 Sample: T = 750 C
;
_database_code_amcsd 0006688
_chemical_formula_sum '(Mg Mn) Si O4'
_cell_length_a 4.8530
_cell_length_b 10.5664
_cell_length_c 6.1908
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 317.456
_exptl_crystal_density_diffrn      3.585
_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
MgM1   0.00000   0.00000   0.00000   0.69100   0.02660
MnM1   0.00000   0.00000   0.00000   0.30900   0.02660
MnM2   0.97500   0.27100   0.25000   0.69100   0.02660
MgM2   0.97500   0.27100   0.25000   0.30900   0.02660
Si   0.42530   0.09330   0.25000   1.00000   0.01659
O1   0.75950   0.09040   0.25000   1.00000   0.02672
O2   0.22240   0.45210   0.25000   1.00000   0.02482
O3   0.28220   0.16250   0.03850   1.00000   0.02685