data_global _chemical_name_mineral 'Landauite' loop_ _publ_author_name 'Grey I E' 'Gatehouse B M' _journal_name_full 'The Canadian Mineralogist' _journal_volume 16 _journal_year 1978 _journal_page_first 63 _journal_page_last 68 _publ_section_title ; The crystal structure of landauite, Na[MnZn2(Ti,Fe)6Ti12]O38 ; _database_code_amcsd 0005148 _chemical_formula_sum '(Na.7 K.15 Pb.15) Mn Zn2 Ti15.84 Fe2.16 O38' _cell_length_a 9.152 _cell_length_b 9.152 _cell_length_c 9.152 _cell_angle_alpha 68.99 _cell_angle_beta 68.99 _cell_angle_gamma 68.99 _cell_volume 644.342 _exptl_crystal_density_diffrn 4.448 _symmetry_space_group_name_H-M 'R -3' loop_ _space_group_symop_operation_xyz 'x,y,z' '-z,-x,-y' 'y,z,x' '-x,-y,-z' 'z,x,y' '-y,-z,-x' 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 NaM0 0.00000 0.00000 0.00000 0.70000 0.02913 KM0 0.00000 0.00000 0.00000 0.15000 0.02913 PbM0 0.00000 0.00000 0.00000 0.15000 0.02913 MnM1 0.50000 0.50000 0.50000 1.00000 0.00747 ZnM2 0.31030 0.31030 0.31030 1.00000 0.01001 TiM3 0.34930 0.12610 0.01900 0.64000 0.00646 FeM3 0.34930 0.12610 0.01900 0.36000 0.00646 TiM4 0.30250 0.71960 0.15030 1.00000 0.00608 TiM5 0.47520 0.08620 0.63630 1.00000 0.00545 O1 0.30230 0.62850 0.37780 1.00000 0.00671 O2 0.15550 0.23750 0.93910 1.00000 0.00507 O3 0.91820 0.45920 0.30090 1.00000 0.00545 O4 0.14470 0.51700 0.98900 1.00000 0.00507 O5 0.38920 0.48560 0.13640 1.00000 0.00431 O6 0.70560 0.24200 0.07220 1.00000 0.00355 O7 0.21380 0.21380 0.21380 1.00000 0.00165