data_9000277
_chemical_name 'Pyrophyllite-1Tc'
loop_
_publ_author_name
'Wardle R'
'Brindley G W'
_journal_name_full "American Mineralogist"
_journal_volume 57
_journal_year 1972
_journal_page_first 732
_journal_page_last 750
_publ_section_title
;
 The crystal structures of pyrophyllite, 1Tc, and of its dehydroxylate
;
_chemical_formula_sum 'Al2 Si4 O11'
_cell_length_a 5.1919
_cell_length_b 9.1224
_cell_length_c 9.4990
_cell_angle_alpha 91.17
_cell_angle_beta 100.21
_cell_angle_gamma 88.62
_cell_volume 442.585
_symmetry_space_group_name_H-M 'C -1'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '1/2+x,1/2+y,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
Al   0.55200   0.14900   0.00000
Si1   0.22500   0.48600   0.28600
Si2   0.74900   0.31200   0.28600
O1   0.25000   0.25000   0.00000
O2   0.12300   0.49200   0.11500
O3   0.72800   0.29200   0.11500
O4   0.03700   0.37800   0.35500
O5   0.71700   0.15200   0.35500
O6   0.52200   0.42500   0.32000