data_9009235
_chemical_name 'Nacrite'
loop_
_publ_author_name
'Zheng H'
'Bailey S W'
_journal_name_full "Clays and Clay Minerals"
_journal_volume 42
_journal_year 1994
_journal_page_first 46
_journal_page_last 52
_publ_section_title
;
 Refinement of the nacrite structure
 Locality: Red Mountain near Silverton, Colorado, USA
;
_chemical_formula_sum 'Al2 Si2 O9 H4'
_cell_length_a 8.906
_cell_length_b 5.146
_cell_length_c 15.664
_cell_angle_alpha 90
_cell_angle_beta 113.58
_cell_angle_gamma 90
_cell_volume 657.944
_symmetry_space_group_name_H-M 'C 1 c 1'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Al1   0.15520   0.31980   0.21770
Al2   0.49010   0.32450   0.21730
Sil   0.20120   0.47000   0.02770
Si2   0.37150   0.98310   0.02700
O1   0.24110   0.74990  -0.00410
O2   0.27230   0.24700  -0.01880
O3   0.00290   0.44170  -0.01930
O4   0.26960   0.43850   0.13850
O5   0.46180   0.01100   0.13810
O-h1   0.07950   0.01180   0.14320
O-h2   0.55800   0.63420   0.28380
O-h3   0.17800   0.62960   0.28250
O-h4   0.36930   0.20660   0.28260
H1   0.63460   0.45100   0.12770
H2   0.54750   0.67360   0.32790
H3   0.24320   0.60960   0.32960
H4   0.43170   0.13860   0.32280