data_global
_chemical_name_mineral 'Keiviite-(Yb)'
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 0009370
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Yb2 Si2 O7'
_cell_length_a 6.802
_cell_length_b 8.875
_cell_length_c 4.703
_cell_angle_alpha 90
_cell_angle_beta 102.12
_cell_angle_gamma 90
_cell_volume 277.581
_exptl_crystal_density_diffrn      6.153
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,z'
  '1/2+x,1/2-y,z'
  '-x,y,-z'
  '1/2-x,1/2+y,-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Yb   0.50000   0.80687   0.00000   0.00317
Si   0.71890   0.50000   0.41250   0.00469
O1   0.50000   0.50000   0.50000   0.01292
O2   0.88310   0.50000   0.71510   0.00633
O3   0.73610   0.65040   0.21970   0.00684