data_global
_chemical_name_mineral 'Blodite'
loop_
_publ_author_name
'Rumanova I M'
'Malitskaya G I'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 4 
_journal_year 1959
_journal_page_first 481
_journal_page_last 495
_publ_section_title
;
 Revision of the structure of astrakhanite by weighted phase projection methods
;
_database_code_amcsd 0021235
_chemical_formula_sum 'Na2 Mg S2 O12 H8'
_cell_length_a 11.03
_cell_length_b 8.14
_cell_length_c 5.49
_cell_angle_alpha 90
_cell_angle_beta 100.65
_cell_angle_gamma 90
_cell_volume 484.424
_exptl_crystal_density_diffrn      2.293
_symmetry_space_group_name_H-M 'P 1 21/a 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,z'
  '1/2-x,1/2+y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Na   0.36200   0.07050   0.13400
Mg   0.00000   0.00000   0.00000
S   0.13600   0.29100   0.37000
O1   0.26500   0.26700   0.34900
O2   0.07100   0.13800   0.30700
O3   0.07700   0.42450   0.20300
O4   0.13100   0.33200   0.62600
Wat5   0.15900   0.03500   0.85700
Wat6   0.41700   0.29000   0.82700