data_global
_chemical_name_mineral 'Forsterite'
loop_
_publ_author_name
'Francis C A'
'Ribbe P H'
_journal_name_full 'American Mineralogist'
_journal_volume 65 
_journal_year 1980
_journal_page_first 1263
_journal_page_last 1269
_publ_section_title
;
 The forsterite-tephroite series: I. Crystal structure refinements
 Sample: Fo51 olivine
;
_database_code_amcsd 0000801
_chemical_compound_source 'Langban, Sweden'
_chemical_formula_sum 'Mg1.03 Mn.97 Si O4'
_cell_length_a 4.794
_cell_length_b 10.491
_cell_length_c 6.123
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 307.949
_exptl_crystal_density_diffrn      3.676
_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
Mg1   0.00000   0.00000   0.00000   1.00000
Mn2   0.98700   0.27900   0.25000   0.97000
Mg2   0.98700   0.27900   0.25000   0.03000
Si   0.42260   0.09100   0.25000   1.00000
O1   0.75850   0.08670   0.25000   1.00000
O2   0.23010   0.44890   0.25000   1.00000
O3   0.27820   0.15900   0.03740   1.00000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Mg1 0.00361 0.00753 0.00475 -0.00025 -0.00074 -0.00111
Mn2 0.00710 0.00647 0.00695 0.00061 0.00000 0.00000
Mg2 0.00710 0.00647 0.00695 0.00061 0.00000 0.00000
Si 0.00361 0.00535 0.00475 0.00000 0.00000 0.00000
O1 0.00256 0.00948 0.00703 -0.00051 0.00000 0.00000
O2 0.00466 0.00613 0.00722 -0.00127 0.00000 0.00000
O3 0.00454 0.00725 0.00684 0.00000 0.00000 0.00130