data_global _chemical_name_mineral 'Townendite' loop_ _publ_author_name 'Grey I E' 'Macrae C M' 'Mumme W G' 'Pring A' _journal_name_full 'American Mineralogist' _journal_volume 95 _journal_year 2010 _journal_page_first 646 _journal_page_last 650 _publ_section_title ; Townendite, Na8ZrSi6O18, a new uranium-bearing lovozerite group mineral from the Ilimaussaq alkaline complex, Southern Greenland ; _database_code_amcsd 0005045 _chemical_compound_source 'the Ilimaussaq alkaline complex, Southern Greenland' _chemical_formula_sum 'Zr.67 Sn.04 U.02 Ti.01 Na6.42 Mn.16 Fe.12 Y.14 Ca.16 Si6 O18' _cell_length_a 10.345 _cell_length_b 10.345 _cell_length_c 13.103 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 1214.402 _exptl_crystal_density_diffrn 2.911 _symmetry_space_group_name_H-M 'R -3 m' 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' '-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' '-x,-y,-z' '2/3-x,1/3-y,1/3-z' '1/3-x,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 ZrM 0.00000 0.00000 0.50000 0.67000 0.01700 SnM 0.00000 0.00000 0.50000 0.04000 0.01700 UM 0.00000 0.00000 0.50000 0.02000 0.01700 TiM 0.00000 0.00000 0.50000 0.01000 0.01700 NaA 0.50000 0.00000 0.00000 1.00000 0.02600 NaB 0.50000 0.00000 0.50000 0.70000 0.03600 NaC 0.00000 0.00000 0.25370 0.66000 0.02600 MnC 0.00000 0.00000 0.25370 0.08000 0.02600 FeC 0.00000 0.00000 0.25370 0.06000 0.02600 YC 0.00000 0.00000 0.25370 0.07000 0.02600 CaC 0.00000 0.00000 0.25370 0.08000 0.02600 Si 0.15070 0.30130 0.06610 1.00000 0.02000 O1 0.24090 0.75910 0.06450 1.00000 0.04100 O2 0.11330 0.88670 0.17410 1.00000 0.04900 O3 0.25460 0.00000 0.00000 1.00000 0.04400 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 ZrM 0.01600 0.01600 0.01600 0.00800 0.00000 0.00000 SnM 0.01600 0.01600 0.01600 0.00800 0.00000 0.00000 UM 0.01600 0.01600 0.01600 0.00800 0.00000 0.00000 TiM 0.01600 0.01600 0.01600 0.00800 0.00000 0.00000 NaA 0.02400 0.03900 0.02000 0.02000 -0.00700 -0.01400 NaB 0.03300 0.05700 0.02700 0.02900 0.00600 0.01200 NaC 0.02300 0.02300 0.03200 0.01100 0.00000 0.00000 MnC 0.02300 0.02300 0.03200 0.01100 0.00000 0.00000 FeC 0.02300 0.02300 0.03200 0.01100 0.00000 0.00000 YC 0.02300 0.02300 0.03200 0.01100 0.00000 0.00000 CaC 0.02300 0.02300 0.03200 0.01100 0.00000 0.00000 Si 0.01900 0.02000 0.02300 0.01000 -0.00100 -0.00200 O1 0.03400 0.03400 0.06200 0.02300 -0.00300 0.00300 O2 0.06900 0.06900 0.02400 0.04800 0.00200 -0.00200 O3 0.04300 0.02800 0.05500 0.01400 0.01200 0.02300