data_global
_chemical_name_mineral 'Forsterite'
loop_
_publ_author_name
'Brown G E'
'Prewitt C T'
_journal_name_full 'American Mineralogist'
_journal_volume 58
_journal_year 1973
_journal_page_first 577
_journal_page_last 587
_publ_section_title
;
 High-temperature crystal chemistry of hortonolite
 sample #12052 at T = 710 C
 Note: variety hortonolite
;
_database_code_amcsd 327
_chemical_formula_sum 'Si Mg1.38 Fe.61 Ca.01 O4'
_cell_length_a 4.805
_cell_length_b 10.366
_cell_length_c 6.068
_cell_angle_alpha 90.0
_cell_angle_beta 90.0
_cell_angle_gamma 90.0
_cell_volume 302.239
_exptl_crystal_density_diffrn  3.518
_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
Si   0.4274  0.095  0.25  1.0
Mg1   0.0  0.0  0.0  0.67
Fe1   0.0  0.0  0.0  0.33
Mg2   0.9892  0.2792  0.25  0.71
Fe2   0.9892  0.2792  0.25  0.28
Ca2   0.9892  0.2792  0.25  0.01
O1   0.765  0.0925  0.25  1.0
O2   0.2169  0.4507  0.25  1.0
O3   0.2829  0.1636  0.0357  1.0
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
Si   0.00807  0.01306  0.01511  0.00025  0.0  0.0
Mg1   0.01298  0.0245  0.01735  -0.0005  -0.00222  -0.00542
Fe1   0.01298  0.0245  0.01735  -0.0005  -0.00222  -0.00542
Mg2   0.01708  0.0147  0.01921  0.00025  0.0  0.0
Fe2   0.01708  0.0147  0.01921  0.00025  0.0  0.0
Ca2   0.01708  0.0147  0.01921  0.00025  0.0  0.0
O1   0.00866  0.0196  0.02313  0.00227  0.0  0.0
O2   0.01392  0.01742  0.01884  -0.00025  0.0  0.0
O3   0.01532  0.02395  0.02015  0.00126  -0.0003  0.00542