data_global
_chemical_name_mineral 'Montesommaite'
loop_
_publ_author_name
'Rouse R C'
'Dunn P J'
'Grice J D'
'Schlenker J L'
'Higgins J B'
_journal_name_full 'American Mineralogist'
_journal_volume 75 
_journal_year 1990
_journal_page_first 1415
_journal_page_last 1420
_publ_section_title
;
 Montesommaite, (K,Na)9Al9Si23O64.10H2O, a new zeolite related to merlinoite and
 the gismondine group
;
_database_code_amcsd 0001338
_chemical_formula_sum 'K (Al.58 Si1.42) O6.25 H.5'
_cell_length_a 7.141
_cell_length_b 7.141
_cell_length_c 17.307
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 882.551
_exptl_crystal_density_diffrn      2.937
_symmetry_space_group_name_H-M 'I 41/a m d'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  '1/4-y,3/4-x,1/4+z'
  '3/4-y,1/4-x,3/4+z'
  '1/4+y,3/4+x,1/4-z'
  '3/4+y,1/4+x,3/4-z'
  '1/4+y,3/4-x,1/4-z'
  '3/4+y,1/4-x,3/4-z'
  '1/4-y,3/4+x,1/4+z'
  '3/4-y,1/4+x,3/4+z'
  '1/2+x,-y,1/2+z'
  '+x,1/2-y,+z'
  '1/2-x,y,1/2-z'
  '-x,1/2+y,-z'
  '1/2+x,y,1/2-z'
  '+x,1/2+y,-z'
  '1/2-x,-y,1/2+z'
  '-x,1/2-y,+z'
  '1/4+y,1/4+x,3/4+z'
  '3/4+y,3/4+x,1/4+z'
  '1/4-y,1/4-x,3/4-z'
  '3/4-y,3/4-x,1/4-z'
  '1/4-y,1/4+x,3/4-z'
  '3/4-y,3/4+x,1/4-z'
  '1/4+y,1/4-x,3/4+z'
  '3/4+y,3/4-x,1/4+z'
  '-x,y,z'
  '1/2-x,1/2+y,1/2+z'
  'x,-y,-z'
  '1/2+x,1/2-y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-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
K   0.00000   0.00000   0.50000   1.00000   0.02500
Al   0.00000   0.46300   0.09000   0.29000   0.00500
Si   0.00000   0.46300   0.09000   0.71000   0.00500
O1   0.00000   0.25000   0.11600   1.00000   0.01500
O2   0.18570   0.43600   0.87500   1.00000   0.01500
O3   0.00000   0.00000   0.00000   1.00000   0.01500
Wat   0.00000   0.25000   0.34200   0.25000   0.01500