data_global
_chemical_name_mineral 'Forsterite'
loop_
_publ_author_name
'Hazen R M'
_journal_name_full 'American Mineralogist'
_journal_volume 61 
_journal_year 1976
_journal_page_first 1280
_journal_page_last 1293
_publ_section_title
;
 Effects of temperature and pressure on the crystal structure of forsterite
 T = -196 C, P = 1 atm
 olivine
;
_database_code_amcsd 0000545
_chemical_formula_sum 'Si Mg2 O4'
_cell_length_a 4.746
_cell_length_b 10.18
_cell_length_c 5.976
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 288.726
_exptl_crystal_density_diffrn      3.237
_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
Si   0.42610   0.09390   0.25000
Mg1   0.00000   0.00000   0.00000
Mg2   0.99140   0.27720   0.25000
O1   0.76610   0.09190   0.25000
O2   0.22020   0.44690   0.25000
O3   0.27770   0.16280   0.03330
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 -0.00205 0.00105 0.00036 0.00024 0.00000 0.00000
Mg1 0.00023 0.00263 0.00036 0.00049 -0.00014 -0.00062
Mg2 0.00011 0.00210 0.00072 0.00000 0.00000 0.00000
O1 -0.00023 0.00263 0.00199 0.00122 0.00000 0.00000
O2 -0.00023 0.00053 0.00145 0.00000 0.00000 0.00000
O3 -0.00023 0.00210 0.00036 0.00000 0.00043 0.00000