data_global _chemical_name_mineral 'Blossite' loop_ _publ_author_name 'Calvo C' 'Faggiani R' _journal_name_full 'Acta Crystallographica, Section B' _journal_volume 31 _journal_year 1975 _journal_page_first 603 _journal_page_last 605 _publ_section_title ; Alpha cupric divanadate ; _database_code_amcsd 0009530 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Cu2 V2 O7' _cell_length_a 20.645 _cell_length_b 8.383 _cell_length_c 6.442 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 1114.898 _exptl_crystal_density_diffrn 4.063 _symmetry_space_group_name_H-M 'F d d 2' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2+y,1/2+z' '1/2+x,y,1/2+z' '1/2+x,1/2+y,z' '1/4+x,1/4-y,1/4+z' '1/4+x,3/4-y,3/4+z' '3/4+x,1/4-y,3/4+z' '3/4+x,3/4-y,1/4+z' '1/4-x,1/4+y,1/4+z' '1/4-x,3/4+y,3/4+z' '3/4-x,1/4+y,3/4+z' '3/4-x,3/4+y,1/4+z' '-x,1/2-y,1/2+z' '-x,-y,+z' '1/2-x,1/2-y,+z' '1/2-x,-y,1/2+z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Cu 0.16580 0.36460 0.75000 0.01600 V 0.19906 0.40540 0.23430 0.00500 O1 0.24530 0.56220 0.27740 0.02100 O2 0.14460 0.43680 0.03320 0.01000 O3 0.16190 0.34770 0.45920 0.01300 O4 0.25000 0.25000 0.15920 0.02800