data_global
_chemical_name_mineral 'Yttrialite-(Y)'
loop_
_publ_author_name
'Batalieva N G'
'Pyatenko Yu A'
_journal_name_full 'Kristallografiya'
_journal_volume 16 
_journal_year 1971
_journal_page_first 905
_journal_page_last 910
_publ_section_title
;
 Artificial yttrialite (gamma-phase) - a representative of a
 new structure type in the rare earth diorthosilicate series
;
_database_code_amcsd 0014180
_chemical_formula_sum 'Y2 Si2 O7'
_cell_length_a 7.50
_cell_length_b 8.06
_cell_length_c 5.02
_cell_angle_alpha 90
_cell_angle_beta 112.0
_cell_angle_gamma 90
_cell_volume 281.362
_exptl_crystal_density_diffrn      4.084
_symmetry_space_group_name_H-M 'P 1 21/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,z'
  '-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_U_iso_or_equiv
Y1   0.00000   0.00000   0.00000   0.03673
Y2   0.50000   0.00000   0.00000   0.03673
Si1   0.12000   0.25000   0.58800   0.03673
Si2   0.70900   0.25000   0.54800   0.03673
O1   0.19000   0.25000   0.31000   0.03673
O2   0.50800   0.25000   0.26400   0.03673
O3   0.88000   0.25000   0.43000   0.03673
O4   0.19000   0.09000   0.80000   0.03673
O5   0.68800   0.09000   0.73600   0.03673