data_global
_amcsd_formula_title 'Er2Si2O7'
loop_
_publ_author_name
'Smolin Y I'
'Shepelev Y F'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 26 
_journal_year 1970
_journal_page_first 484
_journal_page_last 492
_publ_section_title
;
 The crystal structures of the rare earth pyrosilicates
;
_database_code_amcsd 0009371
_chemical_formula_sum 'Er2 Si2 O7'
_cell_length_a 4.683
_cell_length_b 5.556
_cell_length_c 10.79
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 96
_cell_volume 279.204
_exptl_crystal_density_diffrn      5.979
_symmetry_space_group_name_H-M 'P 1 1 21/b'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2+y,1/2-z'
  '-x,1/2-y,1/2+z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Er   0.88829   0.09318   0.34934   0.00367
Si   0.36010   0.64420   0.38710   0.00418
O1   0.50000   0.50000   0.50000   0.01153
O2   0.20520   0.86530   0.44860   0.00811
O3   0.12350   0.45830   0.31910   0.00798
O4   0.61840   0.75220   0.29840   0.00709