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