data_global
_chemical_name_mineral 'Vishnevite'
loop_
_publ_author_name
'Della Ventura G'
'Bellatreccia F'
'Parodi G C'
'Camara F'
'Piccinini M'
_journal_name_full 'American Mineralogist'
_journal_volume 92 
_journal_year 2007
_journal_page_first 713
_journal_page_last 721
_publ_section_title
;
 Single-crystal FTIR and X-ray study of vishnevite, ideally
 [Na6(SO4)][Na2(H2O)2](Si6Al6O24)
 Sample: Pi4
;
_database_code_amcsd 0004320
_chemical_compound_source 'Latium, Italy'
_chemical_formula_sum 'Na1.88 K1.29 Al3 Si3 S.29 O14.62'
_cell_length_a 12.7228
_cell_length_b 12.7228
_cell_length_c 5.1980
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 728.672
_exptl_crystal_density_diffrn      2.288
_symmetry_space_group_name_H-M 'P 63'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x-y,x,1/2+z'
  '-y,x-y,z'
  '-x,-y,1/2+z'
  '-x+y,-x,z'
  'y,-x+y,1/2+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Na1   0.66667   0.33333   0.13330   0.83000   0.03400
Na2   0.11410   0.22580   0.29400   0.35000   0.02400
K   0.14580   0.28940   0.28930   0.43000   0.04200
Al   0.33840   0.41440   0.75700   1.00000   0.00900
Si   0.08340   0.41340   0.75620   1.00000   0.00800
S   0.00000   0.00000   0.29180   0.29000   0.04500
O1   0.20190   0.40440   0.67990   1.00000   0.01700
O2   0.11920   0.55350   0.73320   1.00000   0.02300
O3   0.03860   0.35990   0.04190   1.00000   0.01800
O4   0.32790   0.35270   0.05970   1.00000   0.01700
O51   0.06150   0.11330   0.67250   0.22000   0.15000
O52   0.04960   0.10900   0.95410   0.25000   0.13900
O6   0.61840   0.30430   0.68930   0.33000   0.06200
O7   0.00000   0.00000   0.07370   0.22000   0.06800
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
Na1 0.01900 0.01900 0.06400 0.01000 0.00000 0.00000
Na2 0.01700 0.03900 0.02300 0.02000 -0.00400 -0.00500
K 0.03800 0.06500 0.03200 0.03400 -0.00300 -0.00600
Al 0.00900 0.01000 0.00800 0.00600 0.00000 0.00100
Si 0.00800 0.00900 0.00800 0.00500 0.00000 0.00100
S 0.04000 0.04000 0.05700 0.02000 0.00000 0.00000
O1 0.01000 0.02600 0.01800 0.01100 0.00200 0.00000
O2 0.02200 0.01400 0.03500 0.01100 0.00600 0.00400
O3 0.01400 0.02700 0.01100 0.01100 0.00200 0.00400
O4 0.02100 0.02400 0.01100 0.01500 -0.00100 0.00500