data_global
_chemical_name_mineral 'Forsterite'
loop_
_publ_author_name
'Liang J'
'Hawthorne F C'
_journal_name_full 'The Canadian Mineralogist'
_journal_volume 32 
_journal_year 1994
_journal_page_first 541
_journal_page_last 552
_publ_section_title
;
 Characterization of fine-grained mixtures of rock-forming minerals by Rietveld
 structure refinement: olivine + pyroxene
 Sample: P3 Rietveld, 30.6% olivine
;
_database_code_amcsd 0005399
_chemical_formula_sum 'Si (Mg1.772 Fe.228) O4'
_cell_length_a 4.7654
_cell_length_b 10.2396
_cell_length_c 5.9984
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 292.697
_exptl_crystal_density_diffrn      3.356
_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
Si   0.42700   0.09500   0.25000   1.00000   0.00494
MgM1   0.00000   0.00000   0.00000   0.87200   0.00507
FeM1   0.00000   0.00000   0.00000   0.12800   0.00507
MgM2   0.99000   0.27800   0.25000   0.90000   0.00519
FeM2   0.99000   0.27800   0.25000   0.10000   0.00519
O1   0.76900   0.09500   0.25000   1.00000   0.00633
O2   0.20700   0.44500   0.25000   1.00000   0.00608
O3   0.27600   0.16400   0.03000   1.00000   0.00659