data_global
_chemical_name_mineral 'Eudidymite'
loop_
_publ_author_name
'Ito T'
_journal_name_full 'American Mineralogist'
_journal_volume 32 
_journal_year 1947
_journal_page_first 442
_journal_page_last 453
_publ_section_title
;
 The structure of eudidymite (HNaBeSi3O8)
 Note: this structure does not make any sense
;
_database_code_amcsd 0000043
_chemical_formula_sum 'Na Be Si3 O8 H'
_cell_length_a 12.62
_cell_length_b 7.37
_cell_length_c 13.99
_cell_angle_alpha 90
_cell_angle_beta 103.72
_cell_angle_gamma 90
_cell_volume 1264.073
_exptl_crystal_density_diffrn      2.577
_symmetry_space_group_name_H-M 'C 1 2/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-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
Na1   0.00000   0.03000   0.25000
Na2   0.50000   0.03000   0.25000
Be   0.42700   0.13000   0.32000
Si1   0.06300   0.41500   0.31200
Si2   0.56300   0.41500   0.31200
Si3   0.24100   0.12200   0.24300
O1   0.05200   0.03000   0.39600
O2   0.55200   0.03000   0.39600
O3   0.00000   0.27500   0.25000
O4   0.50000   0.27500   0.25000
O5   0.16100   0.03000   0.19000
O6   0.66100   0.03000   0.19000
O7   0.20800   0.31500   0.37200
O8   0.70800   0.31500   0.37200
O-H   0.30300   0.19000   0.49400