data_global
_chemical_name_mineral 'Moganite'
loop_
_publ_author_name
'Heaney P J'
'Post J E'
_journal_name_full 'American Mineralogist'
_journal_volume 86
_journal_year 2001
_journal_page_first 1358
_journal_page_last 1366
_publ_section_title
;
 Evidence for an I2/a to Imab phase transition in the silica
 polymorph moganite at ~570 K
 Sample: T = 1354 K
;
_database_code_amcsd 2738
_chemical_formula_sum 'Si O2'
_cell_length_a 8.8159
_cell_length_b 4.9371
_cell_length_c 10.7605
_cell_angle_alpha 90.0
_cell_angle_beta 90.0
_cell_angle_gamma 90.0
_cell_volume 468.351
_exptl_crystal_density_diffrn  2.556
_symmetry_space_group_name_H-M 'I m a b'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  '1/2+x,y,-z'
  '+x,1/2+y,1/2-z'
  '1/2-x,-y,z'
  '-x,1/2-y,1/2+z'
  'x,-y,-z'
  '1/2+x,1/2-y,1/2-z'
  '-x,y,z'
  '1/2-x,1/2+y,1/2+z'
  '1/2-x,y,-z'
  '-x,1/2+y,1/2-z'
  '1/2+x,-y,z'
  '+x,1/2-y,1/2+z'
  '-x,-y,-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
_atom_site_U_iso_or_equiv
Si1   0.25  0.0  0.0  0.03
Si2   0.0  0.2255  0.1701  0.03
O1   0.0  0.0416  0.2935  0.03
O2   0.1471  0.2007  0.0824  0.03