data_global
_chemical_name_mineral 'Leonite'
loop_
_publ_author_name
'Hertweck B'
'Giester G'
'Libowitzky E'
_journal_name_full 'American Mineralogist'
_journal_volume 86 
_journal_year 2001
_journal_page_first 1282
_journal_page_last 1292
_publ_section_title
;
 The crystal structures of the low-temperature phases of leonite-type compounds,
 K2Me(SO4)2.4H2O (Me=Mg,Mn,Fe)
 Sample: K2Mg(SO4)2.4H2O, T = 170 K
;
_database_code_amcsd 0002728
_chemical_formula_sum 'K2 Mg S2 O12 H8'
_cell_length_a 11.780
_cell_length_b 9.486
_cell_length_c 19.730
_cell_angle_alpha 90
_cell_angle_beta 95.23
_cell_angle_gamma 90
_cell_volume 2195.552
_exptl_crystal_density_diffrn      2.219
_symmetry_space_group_name_H-M 'I 1 2/a 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  '-x,y,-z'
  '1/2-x,1/2+y,1/2-z'
  '1/2+x,1/2-y,z'
  '+x,-y,1/2+z'
  '1/2-x,1/2-y,-z'
  '-x,-y,1/2-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
K1  -0.16787   0.26888  -0.12018   0.01320
K2   0.16701   0.25821   0.12922   0.01240
Mg1   0.00000  -0.00112   0.00000   0.00800
Mg2   0.00000   0.50000   0.25000   0.00730
S1   0.20754   0.49638  -0.02192   0.00740
S2   0.21271   0.00706  -0.24073   0.00720
O1A  -0.15810   0.37470   0.05556   0.01340
O1B   0.16000  -0.37060  -0.05912   0.01320
O2A   0.15040  -0.09230  -0.20014   0.01360
O2B   0.17840   0.15270  -0.22726   0.01500
O3   0.16880  -0.00090   0.02694   0.01860
O4   0.18120   0.49120   0.04870   0.01730
O5   0.16410   0.49180   0.21902   0.01130
O6   0.19020   0.02280   0.18618   0.01490
Ow1A   0.03760   0.34290  -0.17806   0.01130
Ow1B   0.04300  -0.34030  -0.18099   0.01120
Ow2A   0.00000   0.21850   0.00000   0.01500
Ow2B   0.00000  -0.21960   0.00000   0.01870
Ow3   0.01420  -0.00170  -0.10481   0.01710
H1A   0.07700   0.28000  -0.19500   0.02000
H2A   0.07800   0.36000  -0.13900   0.03700
H1B   0.07400  -0.27200  -0.19500   0.02100
H2B   0.08300  -0.35600  -0.14200   0.03300
H3A   0.04900   0.27100  -0.01500   0.03600
H3B   0.05000  -0.27400  -0.01500   0.04400
H4   0.06500  -0.01500  -0.12900   0.03500
H5  -0.04100   0.00700  -0.13200   0.02600