From: Bob Hanson <[EMAIL PROTECTED]>
> 
> Quick fix:
> 
> change your designation
> 
> _atom_site_label
> 
> to
> 
> _atom_site_type_symbol

I see how the fields didn't match before. At your suggestion, I modified
as (below). With 'spacefill IONIC', the ionic radius for calcium seems
right but carbon and oxygen are still wrong (oxygen should be bigger
than calcium)...and as before. Ideas, or pointer to correctly rendering
cif file?

data_global
_cell_length_a 4.988
_cell_length_b 4.988
_cell_length_c 17.061
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 367.611
_symmetry_space_group_name_H-M 'R -3 c'
loop_
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ca   0.00000   0.00000   0.00000
C   0.00000   0.00000   0.25000
O   0.25670   0.00000   0.25000
loop_
_atom_type_symbol
_atom_type_oxidation_number
Ca 2
C  4
O -2

> I'm using the 10.9.69 pre-release and am getting anomalous results 
> with"spacefill ionic".
> 
> With an (abbreviated-for-clarity) file like this for calcite:
> 
> data_global
> _cell_length_a 4.988
> _cell_length_b 4.988
> _cell_length_c 17.061
> _cell_angle_alpha 90
> _cell_angle_beta 90
> _cell_angle_gamma 120
> _cell_volume 367.611
> _symmetry_space_group_name_H-M 'R -3 c'
> loop_
> _atom_site_label
> _atom_site_fract_x
> _atom_site_fract_y
> _atom_site_fract_z
> Ca   0.00000   0.00000   0.00000
> C   0.00000   0.00000   0.25000
> O   0.25670   0.00000   0.25000
> loop_
> _atom_type_symbol
> _atom_type_oxidation_number
> Ca 2
> C  4
> O -2
> 
> >From the Jmol code, ionic radii should be:
> C+4: 160
> O-2: 1320
> Ca+2: 990
> but with 'spacefill ionic' command, oxygen is smaller than calcium. 
> Ideas?
> --Phillip Barak
> 
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