data_global
_chemical_name_mineral 'Epididymite'
loop_
_publ_author_name
'Pobedimskaya E A'
'Belov N V'
_journal_name_full 'Doklady Akademii Nauk SSSR'
_journal_volume 129 
_journal_year 1959
_journal_page_first 900
_journal_page_last 903
_publ_section_title
;
 The crystal structure of epididymite: a new type of infinite
 silicooxygenous chains
;
_database_code_amcsd 0012437
_chemical_formula_sum 'Na2 Be2 Si6 O17 H2'
_cell_length_a 12.66
_cell_length_b 7.34
_cell_length_c 13.48
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1252.621
_exptl_crystal_density_diffrn      2.686
_symmetry_space_group_name_H-M 'P n a m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,y,1/2-z'
  '-x,-y,1/2+z'
  '1/2-x,1/2+y,1/2+z'
  '1/2+x,1/2-y,1/2-z'
  '1/2+x,1/2-y,z'
  '1/2-x,1/2+y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Na1   0.19400   0.16700   0.49200
Be1   0.02500   0.21000   0.01700
Si1   0.16700   0.50000   0.15000
Si2   0.33400   0.20700   0.14200
Si3   0.15200   0.86000   0.13200
O1   0.40000   0.22500   0.05000
O2   0.11700   0.48300   0.25000
O3   0.38400   0.13000   0.25000
O4   0.07500   0.01700   0.07500
O5   0.11700   0.90000   0.25000
O6   0.07500   0.41000   0.07500
O7   0.27800   0.40000   0.15000
O8   0.20000   0.68400   0.09500
O9   0.26700   0.01000   0.12500
O-H10   0.06000   0.23400   0.58000