data_global
_chemical_name_mineral 'Parakeldyshite'
loop_
_publ_author_name
'Voronkov A A'
'Shumyatskaya N G'
'Pyatenko Y A'
_journal_name_full 'Journal of Structural Chemistry'
_journal_volume 11 
_journal_year 1970
_journal_page_first 866
_journal_page_last 867
_publ_section_title
;
 Crystal structure of a new natural modification of Na2Zr[Si2O7]
;
_database_code_amcsd 0014056
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Na2 Zr Si2 O7'
_cell_length_a 6.66
_cell_length_b 8.83
_cell_length_c 5.42
_cell_angle_alpha 92.75
_cell_angle_beta 94.25
_cell_angle_gamma 72.33
_cell_volume 302.756
_exptl_crystal_density_diffrn      3.350
_symmetry_space_group_name_H-M 'P -1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Na1   0.87400   0.09900   0.26400
Na2   0.29900   0.49200   0.73800
Zr   0.28900   0.27100   0.22000
Si1   0.64200   0.14600   0.77200
Si2   0.93500   0.33600   0.68900
O1   0.29600   0.03700   0.17600
O2   0.88400   0.16900   0.74500
O3   0.49700   0.20600   0.52400
O4   0.55700   0.25200   0.02300
O5   0.00200   0.31600   0.39500
O6   0.12300   0.34000   0.88600
O7   0.30000   0.52000   0.23000