data_global
_chemical_name_mineral 'Maghemite'
loop_
_publ_author_name
'Pecharroman C'
'Gonzalez-Carreno T'
'Iglesias J E'
_journal_name_full 'Physics and Chemistry of Minerals'
_journal_volume 22 
_journal_year 1995
_journal_page_first 21
_journal_page_last 29
_publ_section_title
;
 The infrared dielectric properties of maghemite, gamma-Fe2O3,
 from reflectance measurement on pressed powders
 Sample: c) idealized, either one of Fe-oct 1-6,
 or both Fe-oct 6-7 have zero occupancy
;
_database_code_amcsd 0007900
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Fe3 O4'
_cell_length_a 8.33
_cell_length_b 8.33
_cell_length_c 24.99
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1734.029
_exptl_crystal_density_diffrn      5.321
_symmetry_space_group_name_H-M 'P 43 21 2'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'y,x,-z'
  '1/2-y,1/2+x,3/4+z'
  '1/2-x,1/2+y,3/4-z'
  '-x,-y,1/2+z'
  '-y,-x,1/2-z'
  '1/2+y,1/2-x,1/4+z'
  '1/2+x,1/2-y,1/4-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Fe-oct1   0.62500   0.37500   0.08333   1.00000
Fe-oct2   0.12500   0.62500   0.00000   1.00000
Fe-oct3   0.37500   0.12500   0.08333   1.00000
Fe-oct4   0.12500   0.87500   0.08333   1.00000
Fe-oct5   0.87500   0.62500   0.08333   1.00000
Fe-oct6   0.37500   0.37500   0.00000   1.00000
Fe-oct7   0.87500   0.87500   0.00000   1.00000
Fe-tet1   0.50000   0.75000   0.04167   1.00000
Fe-tet2   0.00000   0.25000   0.04167   1.00000
Fe-tet3   0.25000   0.50000   0.12500   1.00000
O1   0.12500   0.12500   0.08333   1.00000
O2   0.62500   0.62500   0.08333   1.00000
O3   0.62500   0.37500   0.00000   1.00000
O4   0.37500   0.12500   0.00000   1.00000
O5   0.62500   0.87500   0.00000   1.00000
O6   0.12500   0.87500   0.00000   1.00000
O7   0.62500   0.12500   0.08333   1.00000
O8   0.37500   0.37500   0.08333   1.00000
O9   0.37500   0.87500   0.08333   1.00000
O10   0.87500   0.37500   0.08333   1.00000
O11   0.87500   0.87500   0.08333   1.00000
O12   0.12500   0.62500   0.08333   1.00000