data_9004192
_chemical_name 'Poudretteite'
loop_
_publ_author_name
'Grice J D'
'Ercit T S'
'Van Velthuizen J'
'Dunn P J'
_journal_name_full "The Canadian Mineralogist"
_journal_volume 25
_journal_year 1987
_journal_page_first 763
_journal_page_last 766
_publ_section_title
;
 Poudretteite, KNa2B3Si12O30, a new member of the osumilite group from
 Mont Saint-Hilaire, Quebec, and its crystal structure
 Locality: Mont Saint-Hilaire, Quebec, Canada
;
_chemical_formula_sum 'K Na2 B3 Si12 O30'
_cell_length_a 10.253
_cell_length_b 10.253
_cell_length_c 13.503
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 1229.314
_symmetry_space_group_name_H-M 'P 6/m c c'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '-x,-x+y,1/2+z'
  'x,x-y,1/2-z'
  '-x+y,-x,-z'
  'x-y,x,z'
  '-y,-x,1/2+z'
  'y,x,1/2-z'
  'y,-x+y,-z'
  '-y,x-y,z'
  'x-y,-y,1/2+z'
  '-x+y,y,1/2-z'
  'x,y,-z'
  '-x,-y,z'
  'x,x-y,1/2+z'
  '-x,-x+y,1/2-z'
  'x-y,x,-z'
  '-x+y,-x,z'
  'y,x,1/2+z'
  '-y,-x,1/2-z'
  '-y,x-y,-z'
  'y,-x+y,z'
  '-x+y,y,1/2+z'
  'x-y,-y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
K   0.00000   0.00000   0.25000
Na   0.33333   0.66667   0.25000
B   0.00000   0.50000   0.25000
Si   0.06950   2.33761   0.11333
O1   0.08210   0.39210   0.00000
O2   0.18920   0.28200   0.13330
O3   0.10040   0.47100   0.18730