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 = 500 C
;
_database_code_amcsd 0006683
_chemical_formula_sum '(Mg Mn) Si O4'
_cell_length_a 4.83551
_cell_length_b 10.5439
_cell_length_c 6.1727
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 314.716
_exptl_crystal_density_diffrn      3.616
_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   0.75400   0.01710
MnM1   0.00000   0.00000   0.00000   0.24600   0.01710
MnM2   0.98200   0.27760   0.25000   0.75400   0.01710
MgM2   0.98200   0.27760   0.25000   0.24600   0.01710
Si   0.42280   0.09310   0.25000   1.00000   0.01127
O1   0.75930   0.08921   0.25000   1.00000   0.01874
O2   0.22580   0.45130   0.25000   1.00000   0.01722
O3   0.28020   0.16110   0.03820   1.00000   0.01938