data_global
_amcsd_formula_title 'FeMnSiO4'
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 = 700 C
;
_database_code_amcsd 0006664
_chemical_formula_sum '(Fe Mn) Si O4'
_cell_length_a 4.89032
_cell_length_b 10.6595
_cell_length_c 6.22274
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 324.381
_exptl_crystal_density_diffrn      4.154
_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
FeM1   0.00000   0.00000   0.00000   0.65900   0.02102
MnM1   0.00000   0.00000   0.00000   0.34100   0.02102
MnM2   0.97000   0.28810   0.25000   0.65900   0.02102
FeM2   0.97000   0.28810   0.25000   0.34100   0.02102
Si   0.42670   0.09650   0.25000   1.00000   0.01330
O1   0.76160   0.09400   0.25000   1.00000   0.02343
O2   0.21310   0.45520   0.25000   1.00000   0.02394
O3   0.28800   0.16450   0.04030   1.00000   0.02280