data_global _chemical_name_mineral 'Rhodesite' loop_ _publ_author_name 'Hesse K F' 'Liebau F' 'Merlino S' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 199 _journal_year 1992 _journal_page_first 25 _journal_page_last 48 _publ_section_title ; Crystal structure of rhodesite, HK1-xNax+2yCa2-y(lB,3,22)(Si8O19)*(6-z)H2O, from three localities and its relation to other silicates with dreier double layers ; _database_code_amcsd 0011014 _chemical_compound_source 'Trinity County, California, USA' _chemical_formula_sum 'K.255 Ca.494 Si6 O17.944 H5.388' _cell_length_a 23.4439 _cell_length_b 6.553 _cell_length_c 7.055 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 1083.845 _exptl_crystal_density_diffrn 1.504 _symmetry_space_group_name_H-M 'P m a m' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,y,-z' '-x,-y,z' '1/2-x,y,z' '1/2+x,-y,-z' '1/2+x,-y,z' '1/2-x,y,-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 K 0.25000 0.44600 0.00000 0.25500 0.03300 Ca1 0.00000 0.50000 0.00000 0.24600 0.01500 Ca2 0.00000 0.50000 0.50000 0.24800 0.01000 Si1 0.11680 0.28910 0.22000 1.00000 0.00700 Si2 0.18360 0.54270 0.50000 0.50000 0.00600 Si3 0.10220 0.93030 0.50000 0.50000 0.00600 O1 0.05920 0.40760 0.24760 1.00000 0.01300 O2 0.17180 0.40770 0.31140 1.00000 0.01600 O3 0.11640 0.06290 0.31440 1.00000 0.02600 O4 0.13450 0.25730 0.00000 0.50000 0.00700 O5 0.14650 0.74180 0.50000 0.50000 0.01400 O6 0.03780 0.85430 0.50000 0.50000 0.02300 O7 0.25000 0.60810 0.50000 0.25000 0.00700 Wat8 0.03900 0.83990 0.00000 0.55200 0.08800 Wat9 0.33120 0.78010 0.00000 0.51700 0.06400 Wat10 0.25000 0.02470 0.18950 0.27800 0.06500