data_global
_chemical_name_mineral 'Hyalophane'
loop_
_publ_author_name
'De Pieri R'
'Quareni S'
'Hall K M'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 33 
_journal_year 1977
_journal_page_first 3073
_journal_page_last 3076
_publ_section_title
;
 Refinement of the structures of low and high hyalophanes
 Sample: Low hyalophane
;
_database_code_amcsd 0009608
_chemical_formula_sum '(K.43 Ba.39 Na.17 Ca.01) (Si2.58 Al1.42) O8'
_cell_length_a 8.557
_cell_length_b 13.040
_cell_length_c 7.200
_cell_angle_alpha 90
_cell_angle_beta 115.69
_cell_angle_gamma 90
_cell_volume 723.986
_exptl_crystal_density_diffrn      2.876
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,z'
  '1/2+x,1/2-y,z'
  '-x,y,-z'
  '1/2-x,1/2+y,-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
K   0.28257   0.00000   0.13252   0.43000
Ba   0.28257   0.00000   0.13252   0.39000
Na   0.28257   0.00000   0.13252   0.17000
Ca   0.28257   0.00000   0.13252   0.01000
Si1   0.00850   0.18319   0.22430   0.64500
Al1   0.00850   0.18319   0.22430   0.35500
Si2   0.70440   0.11784   0.34530   0.64500
Al2   0.70440   0.11784   0.34530   0.35500
O1a   0.00000   0.14310   0.00000   1.00000
O1b   0.62650   0.00000   0.28540   1.00000
O2   0.82550   0.14060   0.22530   1.00000
O3   0.02960   0.31030   0.25700   1.00000
O4   0.18470   0.12610   0.40200   1.00000