data_global
_chemical_name_mineral 'Weeksite'
loop_
_publ_author_name
'Fejfarova K'
'Plasil J'
'Yang H'
'Cejka J'
'Dusek M'
'Downs R T'
'Barkley M C'
'Skoda R'
_journal_name_full 'American Mineralogist'
_journal_volume 97 
_journal_year 2012
_journal_page_first 750
_journal_page_last 754
_publ_section_title
;
 Revision of the crystal structure and chemical formula of weeksite,
 K2(UO2)2(Si5O13)*4H2O
;
_database_code_amcsd 0018760
_chemical_compound_source 'Anderson mine, Arizona, USA'
_chemical_formula_sum 'U4 K3.762 Si10 O41.858 H15.716'
_cell_length_a 14.1957
_cell_length_b 14.2291
_cell_length_c 9.6305
_cell_angle_alpha 90
_cell_angle_beta 111.578
_cell_angle_gamma 90
_cell_volume 1808.954
_exptl_crystal_density_diffrn      3.792
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,z'
  '1/2+x,1/2-y,z'
  '-x,y,-z'
  '1/2-x,1/2+y,-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-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
U1   0.09933   0.24679   0.89678   1.00000   0.01189
K1  -0.07070   0.00000   0.86020   0.95100   0.03690
K2   0.24600   0.00000   0.84330   0.93000   0.05400
Si1   0.00000   0.30680   0.50000   1.00000   0.01660
Si2   0.18748   0.24984   0.24950   1.00000   0.01160
Si3   0.29855   0.10998   0.50040   1.00000   0.01840
O1   0.41050   0.12240   0.49960   1.00000   0.03300
O2   0.07120   0.24400   0.13700   1.00000   0.02300
O3   0.24720   0.25510   0.13670   1.00000   0.02400
O4   0.03660   0.24370   0.64730   1.00000   0.02300
O5   0.21620   0.15600   0.35460   1.00000   0.02700
O6   0.27050   0.00000   0.49980   1.00000   0.02200
O7   0.28920   0.15730   0.64670   1.00000   0.02600
O8   0.10200   0.12010   0.90550   1.00000   0.02900
O9   0.09900   0.37270   0.89720   1.00000   0.03200
Wat10   0.43100   0.00000   0.84110   1.00000   0.05300
Wat11  -0.26240   0.00000   0.84410   0.98000   0.05900
Wat12   0.00000   0.00000   0.50000   0.72000   0.03600
Wat13   0.00000  -0.07900   0.50000   0.25900   0.03600
Wat14  -0.04640  -0.06140   0.60200   0.28100   0.03600
Wat15  -0.09170  -0.06360   0.39800   0.26400   0.03600
Wat16  -0.44500   0.00000   0.70200   0.24000   0.02400
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
U1 0.00807 0.01867 0.00959 0.00057 0.00403 0.00072
K1 0.02800 0.03100 0.05700 0.00000 0.02240 0.00000
K2 0.05800 0.04000 0.08900 0.00000 0.05500 0.00000
Si1 0.01330 0.02440 0.01210 0.00000 0.00460 0.00000
Si2 0.00940 0.01800 0.00800 0.00110 0.00380 -0.00100
Si3 0.02200 0.01560 0.01920 -0.00110 0.00950 0.00000
O1 0.02000 0.03000 0.05200 -0.00500 0.01800 -0.00200
O2 0.00600 0.05500 0.00700 0.00000 0.00100 -0.00100
O3 0.00900 0.05500 0.00900 0.00000 0.00500 -0.00100
O4 0.02400 0.03700 0.00800 0.00300 0.00600 0.00600
O5 0.02800 0.02600 0.02100 -0.00100 0.00200 0.01100
O6 0.02900 0.01200 0.02900 0.00000 0.01300 0.00000
O7 0.03600 0.01800 0.02700 -0.00300 0.01600 -0.00700
O8 0.03500 0.01900 0.04000 -0.00100 0.02100 0.00100
O9 0.03600 0.02000 0.04200 -0.00300 0.01600 -0.00300
Wat10 0.03300 0.04000 0.07300 0.00000 0.00500 0.00000
Wat11 0.05900 0.05200 0.07300 0.00000 0.03400 0.00000