data_global _chemical_name_mineral 'Pyatenkoite-(Y)' loop_ _publ_author_name 'Rastsvetaeva R K' 'Khomyakov A P' _journal_name_full 'Doklady Chemistry' _journal_volume 351 _journal_year 1996 _journal_page_first 283 _journal_page_last 286 _publ_section_title ; Crystal structure of pyatenkoite-(Y) Na5YTiSi6O18*6H2O, a new mineral of the hilairite group: crystal structure ; _database_code_amcsd 0012500 _chemical_compound_source 'Lovozero massif, Kola Peninsula, Russia' _chemical_formula_sum 'Na5 (Y.5 Dy.3 Gd.2) (Ti.8 Nb.2) Si6 O24 H12' _cell_length_a 10.696 _cell_length_b 10.696 _cell_length_c 15.728 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 1558.285 _exptl_crystal_density_diffrn 2.753 _symmetry_space_group_name_H-M 'R 3 2' loop_ _space_group_symop_operation_xyz 'x,y,z' '2/3+x,1/3+y,1/3+z' '1/3+x,2/3+y,2/3+z' '-x,-x+y,-z' '2/3-x,1/3-x+y,1/3-z' '1/3-x,2/3-x+y,2/3-z' 'y,x,-z' '2/3+y,1/3+x,1/3-z' '1/3+y,2/3+x,2/3-z' 'x-y,-y,-z' '2/3+x-y,1/3-y,1/3-z' '1/3+x-y,2/3-y,2/3-z' '-y,x-y,z' '2/3-y,1/3+x-y,1/3+z' '1/3-y,2/3+x-y,2/3+z' '-x+y,-x,z' '2/3-x+y,1/3-x,1/3+z' '1/3-x+y,2/3-x,2/3+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 Na1 0.00000 0.00000 0.19330 1.00000 0.02786 Na2 0.36500 0.00000 0.50000 1.00000 0.03926 YM2 0.33333 0.66667 0.16667 0.50000 0.01279 DyM2 0.33333 0.66667 0.16667 0.30000 0.01279 GdM2 0.33333 0.66667 0.16667 0.20000 0.01279 TiM1 0.00000 0.00000 0.00000 0.80000 0.00988 NbM1 0.00000 0.00000 0.00000 0.20000 0.00988 Si 0.42280 0.40730 0.24760 1.00000 0.00874 O1 0.09200 0.16800 0.07490 1.00000 0.01520 O2 0.10300 0.21100 0.57200 1.00000 0.01646 O3 0.65700 0.00000 0.00000 1.00000 0.01267 O4 0.64100 0.00000 0.50000 1.00000 0.02280 Ow5 0.50300 0.14400 0.05890 1.00000 0.02280 H1 0.53000 0.43000 0.04000 1.00000 0.02533 H2 0.48000 0.68000 0.00000 1.00000 0.02533