data_global _chemical_name_mineral 'Vinogradovite' loop_ _publ_author_name 'Rastsvetaeva R K' 'Andrianov V I' _journal_name_full 'Soviet Physics Crystallography' _journal_volume 29 _journal_year 1984 _journal_page_first 403 _journal_page_last 406 _publ_section_title ; Refined crystal structure of vinogradovite ; _database_code_amcsd 0019786 _chemical_compound_source 'Kola peninsula, Russia' _chemical_formula_sum 'Na Ti Si2 O7.34 H1.68' _cell_length_a 5.219 _cell_length_b 8.691 _cell_length_c 25.01 _cell_angle_alpha 90 _cell_angle_beta 104.43 _cell_angle_gamma 90 _cell_volume 1098.624 _exptl_crystal_density_diffrn 2.977 _symmetry_space_group_name_H-M 'A 1 2/a 1' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2+y,1/2+z' '1/2+x,-y,z' '1/2+x,1/2-y,1/2+z' '1/2-x,y,-z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' '-x,1/2-y,1/2-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv Na 0.00370 0.19120 0.15000 1.00000 0.02381 Ti 0.48760 0.09540 0.34910 1.00000 0.01013 Si1 0.30950 0.40880 0.26710 1.00000 0.00963 Si2 0.35450 0.10180 0.06490 1.00000 0.01469 O1 0.25000 0.15660 0.00000 1.00000 0.02406 O2 0.33550 0.45980 0.42090 1.00000 0.02292 O3 0.39900 0.01070 0.20810 1.00000 0.01343 O4 0.22520 0.06700 0.38400 1.00000 0.01684 O5 0.30510 0.23990 0.29250 1.00000 0.01773 O6 0.23400 0.41860 0.20070 1.00000 0.01330 O7 0.32940 0.25050 0.10480 1.00000 0.01824 Wat1 0.25000 0.11600 0.50000 0.90000 0.09841 Wat2 -0.02200 0.41600 0.02500 0.39000 0.06320