data_global
_chemical_name_mineral 'Boltwoodite'
loop_
_publ_author_name
'Stohl F V'
'Smith D K'
_journal_name_full 'American Mineralogist'
_journal_volume 66 
_journal_year 1981
_journal_page_first 610
_journal_page_last 625
_publ_section_title
;
 The crystal chemistry of the uranyl silicate minerals
;
_database_code_amcsd 0000838
_chemical_compound_source 'New Method mine, Amboy, California, USA'
_chemical_formula_sum 'U K Si O7 H2'
_cell_length_a 7.073
_cell_length_b 7.064
_cell_length_c 6.638
_cell_angle_alpha 90
_cell_angle_beta 105.75
_cell_angle_gamma 90
_cell_volume 319.207
_exptl_crystal_density_diffrn      4.362
_symmetry_space_group_name_H-M 'P 1 21 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,1/2+y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
U   0.02520   0.25000   0.13850   0.13805
K   0.54100   0.54800   0.15000   0.43568
Si   0.93300   0.25000   0.63000   0.89796
O1   0.29000   0.25000   0.14000   0.89416
O2   0.22700   0.75000   0.88000   0.68265
O3   0.02200  -0.07900   0.19000   0.56613
O4  -0.02200   0.07900  -0.19000   0.56613
O5   0.06000   0.25000   0.48000   0.51800
O6   0.29400   0.75000   0.49000   0.04686
Wat   0.40000   0.41300   0.68000   1.16899