data_global _chemical_name_mineral 'Steacyite' loop_ _publ_author_name 'Prichard P' 'Perrault G' _journal_name_full 'Acta Crystallographica, Section B' _journal_volume 28 _journal_year 1972 _journal_page_first 1994 _journal_page_last 1999 _publ_section_title ; Structure cristalline de l'ekanite de St-Hilaire, P.Q. ; _database_code_amcsd 0018511 _chemical_compound_source 'Mont St-Hilaire, Quebec, Canada' _chemical_formula_sum 'K.6 Na.9 Ca.74 Mn.2 Mg.04 Th.88 Ce.03 Pb.01 Si8 O20' _cell_length_a 7.58 _cell_length_b 7.58 _cell_length_c 14.77 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 848.631 _exptl_crystal_density_diffrn 3.291 _symmetry_space_group_name_H-M 'P 4/m c c' loop_ _space_group_symop_operation_xyz 'x,y,z' '-y,-x,1/2+z' 'y,x,1/2-z' 'y,-x,-z' '-y,x,z' 'x,-y,1/2+z' '-x,y,1/2-z' 'x,y,-z' '-x,-y,z' 'y,x,1/2+z' '-y,-x,1/2-z' '-y,x,-z' 'y,-x,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 K 0.00000 0.00000 0.00000 0.60000 Na 0.00000 0.50000 0.25000 0.45000 Ca 0.00000 0.50000 0.25000 0.37000 Mn 0.00000 0.50000 0.25000 0.10000 Mg 0.00000 0.50000 0.25000 0.02000 Th 0.00000 0.00000 0.25000 0.88000 Ce 0.00000 0.00000 0.25000 0.03000 Pb 0.00000 0.00000 0.25000 0.01000 Si 0.26050 0.33600 0.10730 1.00000 O1 0.23050 0.33600 0.00000 1.00000 O2 0.45360 0.25710 0.13270 1.00000 O3 0.10810 0.24710 0.16320 1.00000 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 K 0.02474 0.02474 0.02984 0.00000 0.00000 0.00000 Na 0.02387 0.01659 0.01879 0.00000 0.00000 0.00000 Ca 0.02387 0.01659 0.01879 0.00000 0.00000 0.00000 Mn 0.02387 0.01659 0.01879 0.00000 0.00000 0.00000 Mg 0.02387 0.01659 0.01879 0.00000 0.00000 0.00000 Th 0.01426 0.01426 0.01326 0.00000 0.00000 0.00000 Ce 0.01426 0.01426 0.01326 0.00000 0.00000 0.00000 Pb 0.01426 0.01426 0.01326 0.00000 0.00000 0.00000 Si 0.01426 0.01368 0.01326 -0.00029 0.00170 0.00113 O1 0.03755 0.03842 0.01326 0.00175 0.00000 0.00000 O2 0.01601 0.02358 0.03094 0.00262 0.00113 0.00340 O3 0.02096 0.01892 0.02542 -0.00087 0.00737 0.00907