data_global
_chemical_name_mineral 'Chervetite'
loop_
_publ_author_name
'Shannon R D'
'Calvo C'
_journal_name_full 'Canadian Journal of Chemistry'
_journal_volume 51 
_journal_year 1973
_journal_page_first 70
_journal_page_last 76
_publ_section_title
;
 Refinement of the crystal structure of synthetic chervetite, Pb2V2O7
;
_database_code_amcsd 0019227
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Pb2 V2 O7'
_cell_length_a 13.3689
_cell_length_b 7.1607
_cell_length_c 7.1027
_cell_angle_alpha 90
_cell_angle_beta 105.935
_cell_angle_gamma 90
_cell_volume 653.819
_exptl_crystal_density_diffrn      6.383
_symmetry_space_group_name_H-M 'P 1 21/a 1'
loop_
_space_group_symop_operation_xyz
  'x,y,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_U_iso_or_equiv
Pb1  -0.13290   0.40884   0.05433 ?
Pb2   0.15435   0.19265   0.33445 ?
V1   0.10870   0.05910  -0.20150 ?
V2  -0.08500   0.32290  -0.38430 ?
O1   0.46210   0.37570   0.15310   0.01410
O2   0.15870   0.19460   0.00150   0.01760
O3   0.29000   0.47610   0.26910   0.01700
O4   0.46790   0.70140   0.40010   0.01650
O5   0.04880   0.50020   0.21560   0.01130
O6   0.15980   0.82360   0.30020   0.02030
O7   0.34630   0.08540   0.39800   0.01270
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
Pb1 0.06000 0.01620 0.01090 -0.00010 0.00110 0.00170
Pb2 0.01140 0.01990 0.00950 0.00190 0.00290 0.00120
V1 0.00700 0.00940 0.00630 -0.00250 0.00000 0.00000
V2 0.00560 0.00870 0.00620 -0.00030 -0.00100 0.00030