I found Bob's table radii.xls and notice that if you ask for "spacefill ionic" 
jmol tries to use the ionic radius for the valence state listed in the CIF 
file. If it doesn't find that valence state in the table, it apparently uses 
the van der Waals radius. Since radii.xls only contains one valence state for 
each atom, jmol will sometimes fail to find the appropriate ionic radius and 
use instead a mixture of ionic and very different van der Waals radii.

1) Can we eventually use our own table of radii ?
2) If jmol doesn't find the right valence state in the table, perhaps it should 
use the radius for a neighbouring valence state rather than the van der Waals 
radius ?
3) I will try to suggest a more complete table of empirical ionic radii with 
the help of I.David Brown.

Alan.
_____________________________________________________________
Dr Alan Hewat, ILL Grenoble, FRANCE<[EMAIL PROTECTED]>fax+33.476.20.76.48
+33.476.20.72.13 (.26 Mme Guillermet)  http://www.ill.fr/dif/people/hewat/
_____________________________________________________________


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