data_global _chemical_name_mineral 'Davidite-(La)' loop_ _publ_author_name 'Gatehouse B M' 'Grey I E' 'Kelly P R' _journal_name_full 'American Mineralogist' _journal_volume 64 _journal_year 1979 _journal_page_first 1010 _journal_page_last 1017 _publ_section_title ; The crystal structure of davidite ; _database_code_amcsd 0000749 _chemical_compound_source 'Pandora Prospect, Quijotoa Mts., Pima County, Arizona, USA' _chemical_formula_sum 'La.91 Ca.2 Sr.09 U.33 Y.3 Fe6.152 Mg.24 Ti12.672 Cr.21 O38' _cell_length_a 9.190 _cell_length_b 9.190 _cell_length_c 9.190 _cell_angle_alpha 68.73 _cell_angle_beta 68.73 _cell_angle_gamma 68.73 _cell_volume 649.693 _exptl_crystal_density_diffrn 4.658 _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 La(0) 0.00000 0.00000 0.00000 0.54000 0.01482 Ca(0) 0.00000 0.00000 0.00000 0.20000 0.01482 Sr(0) 0.00000 0.00000 0.00000 0.09000 0.01482 La(1) 0.50000 0.50000 0.50000 0.37000 0.00671 U(1) 0.50000 0.50000 0.50000 0.33000 0.00671 Y(1) 0.50000 0.50000 0.50000 0.30000 0.00671 Fe(2) 0.30900 0.30900 0.30900 0.79000 0.00595 Mg(2) 0.30900 0.30900 0.30900 0.12000 0.00595 Fe(3) 0.34740 0.12690 0.01840 0.76200 0.00646 Ti(3) 0.34740 0.12690 0.01840 0.11200 0.00646 Cr(3) 0.34740 0.12690 0.01840 0.03500 0.00646 Ti(4) 0.30860 0.72180 0.14480 1.00000 0.00431 Ti(5) 0.47490 0.07750 0.64440 1.00000 0.00380 O(1) 0.29990 0.63000 0.37650 1.00000 0.00684 O(2) 0.14860 0.23470 0.93910 1.00000 0.00621 O(3) 0.91920 0.45740 0.30250 1.00000 0.00545 O(4) 0.14460 0.51370 0.98970 1.00000 0.00697 O(5) 0.38910 0.48690 0.13450 1.00000 0.00659 O(6) 0.71310 0.24040 0.06880 1.00000 0.00608 O(7) 0.21340 0.21340 0.21340 1.00000 0.00747