data_global
_chemical_name_mineral 'Gonnardite'
loop_
_publ_author_name
'Lee Y'
'Hriljac J A'
'Vogt T'
_journal_name_full 'American Mineralogist'
_journal_volume 90 
_journal_year 2005
_journal_page_first 247
_journal_page_last 251
_publ_section_title
;
 Variable-temperature structural studies of tetranatrolite from Mt. Saint-Hilaire:
 Synchrotron X-ray powder diffraction and Rietveld analysis
 Sample: T = 300 C, phase II
;
_chemical_formula_sum '(Si2.685 Al2.315) O10.402 Na1.462 Ca.474 H.204'
_cell_length_a 13.1503
_cell_length_b 13.1503
_cell_length_c 6.2469
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1080.279
_exptl_crystal_density_diffrn      2.196
_symmetry_space_group_name_H-M 'I -4 2 d'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  '1/2-y,-x,3/4+z'
  '-y,1/2-x,1/4+z'
  'y,-x,-z'
  '1/2+y,1/2-x,1/2-z'
  '-x,1/2+y,1/4-z'
  '1/2-x,+y,3/4-z'
  '-x,-y,z'
  '1/2-x,1/2-y,1/2+z'
  '1/2+y,x,3/4+z'
  '+y,1/2+x,1/4+z'
  '-y,x,-z'
  '1/2-y,1/2+x,1/2-z'
  'x,1/2-y,1/4-z'
  '1/2+x,-y,3/4-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
SiT1   0.00000   0.00000   0.00000   0.53700   0.01550
AlT1   0.00000   0.00000   0.00000   0.46300   0.01550
SiT2   0.05260   0.13020   0.61860   0.53700   0.01550
AlT2   0.05260   0.13020   0.61860   0.46300   0.01550
O1   0.39490   0.25000   0.12500   1.00000   0.01710
O2   0.13780   0.04330   0.56350   1.00000   0.01710
O3  -0.00190   0.11020   0.85940   1.00000   0.01710
Na  -0.02820   0.25000   0.12500   0.73100   0.03600
Ca   0.02600   0.25000   0.12500   0.23700   0.03600
Wat5   0.80000   0.25000   0.12500   0.20100   0.03600