data_global _chemical_name_mineral 'Elpidite' loop_ _publ_author_name 'Grigor'eva A A' 'Zubkova N V' 'Pekov I V' 'Kolitsch U' 'Pushcharovsky D Y' 'Vigasina M F' 'Giester G' 'Dordevic T' 'Tillmanns E' 'Chukanov N V' _journal_name_full 'Crystallography Reports' _journal_volume 56 _journal_year 2011 _journal_page_first 832 _journal_page_last 841 _publ_section_title ; Crystal chemistry of elpidite from Kahn Bogdo (Mongolia) and its K- and Rb-exchanged forms Note: Rb-exchanged at 90 deg C ; _database_code_amcsd 0018523 _chemical_compound_source 'Kahn Bogdo, Mongolia' _chemical_formula_sum 'Na1.581 Rb.2 Zr Si6 O17.69 H5.38' _cell_length_a 7.1280 _cell_length_b 14.644 _cell_length_c 14.642 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 1528.368 _exptl_crystal_density_diffrn 2.615 _symmetry_space_group_name_H-M 'P b c m' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,1/2+z' '-x,1/2+y,1/2-z' '-x,1/2+y,z' 'x,1/2-y,-z' 'x,y,1/2-z' '-x,-y,1/2+z' '-x,-y,-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(1) 0.44210 0.23150 0.75000 0.66100 0.03430 Na(2) -0.00290 0.25000 0.50000 0.92000 0.02500 Rb -0.00400 0.14100 0.57890 0.10000 0.03700 Zr 0.49697 0.25000 0.50000 1.00000 0.00939 Si(1) 0.77407 0.38617 0.64615 1.00000 0.01320 Si(2) 0.50553 0.04747 0.64216 1.00000 0.01240 Si(3) 0.21932 0.39087 0.64457 1.00000 0.01280 O(1) 0.99610 0.40400 0.63830 1.00000 0.02420 O(2) 0.72070 0.35600 0.75000 1.00000 0.02260 O(3) 0.70920 0.30910 0.57750 1.00000 0.02210 O(4) 0.67820 0.48460 0.62500 1.00000 0.02320 O(5) 0.51810 0.07270 0.75000 1.00000 0.02190 O(6) 0.49290 0.13950 0.58720 1.00000 0.02370 O(7) 0.30860 0.48920 0.61480 1.00000 0.02210 O(8) 0.28080 0.37230 0.75000 1.00000 0.02250 O(9) 0.28970 0.30970 0.58160 1.00000 0.02180 Wat(1) 0.00880 0.11450 0.58050 0.91000 0.02570 Wat(2) 0.12510 0.18690 0.75000 0.67000 0.04700 Wat(3) 0.01400 0.17600 0.79700 0.10000 0.04000