data_global
_chemical_name_mineral 'Sklodowskite'
loop_
_publ_author_name
'Ryan R R'
'Rosenzweig A'
_journal_name_full 'Crystal Structure Communications'
_journal_volume 6 
_journal_year 1977
_journal_page_first 611
_journal_page_last 615
_publ_section_title
;
 Sklodowskite, MgO*2UO3*2SiO2*7H2O
;
_database_code_amcsd 0012337
_chemical_compound_source 'Naica, Chihuahua, Mexico'
_chemical_formula_sum 'Mg U2 Si2 O18 H10'
_cell_length_a 17.3820
_cell_length_b 7.047
_cell_length_c 6.610
_cell_angle_alpha 90
_cell_angle_beta 105.9
_cell_angle_gamma 90
_cell_volume 778.688
_exptl_crystal_density_diffrn      3.645
_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
Mg   0.50000   0.50000   0.50000
U   0.25763   0.00000   0.13838
Si   0.28360   0.50000   0.35780
O1   0.36390   0.00000   0.16190
O2   0.15090   0.00000   0.10650
O3   0.22630   0.50000   0.51190
O4   0.37790   0.50000   0.50160
O5   0.26730   0.32430   0.19170
Wat   0.51960   0.30290   0.73010
O-H3   0.57600   0.00000   0.22750
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
Mg 0.01400 0.02100 0.01900 0.00000 0.00300 0.00000
U 0.01440 0.00800 0.00840 0.00000 0.00370 0.00000
Si 0.01670 0.00880 0.00810 0.00000 0.00490 0.00000
O1 0.01900 0.01900 0.02600 0.00000 0.00800 0.00000
O2 0.01700 0.02800 0.01700 0.00000 0.00200 0.00000
O3 0.01800 0.01800 0.00900 0.00000 0.00400 0.00000
O4 0.01700 0.03200 0.01600 0.00000 0.00600 0.00000
O5 0.03100 0.00800 0.00800 0.00200 0.00700 0.00000
Wat 0.03300 0.14200 0.15500 0.00800 0.01300 0.12600
O-H3 0.03100 0.05900 0.04800 0.00000 0.01200 0.00000