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