A question from a novice, trying to learn to use Jmol.

I have been trying to load CIF files into Jmol and display ranges of unit cells,

I don't currently understand all the options for doing this but I also get some 
results that appear to me to be a little strange?

I have tried loading examples of CIF files from the American Mineralogist 
Crystal Structure database.

http://rruff.geo.arizona.edu/AMS/amcsd.php 

For example, I downloaded the structure in CIF format for the mineral Dickite 
(the low pressure one by Dera et al, No 03168 in the database)


I open this file in the Jmol application,

and then reload it with the popup menu command labelled "RELOAD {444 666 1}"

My understanding of this command was that it loads a block of unit cells.

However in the resulting model displayed there are two lonely planes of oxygen 
atoms out on their own, and also a number of atoms around the edge of the model 
all of which look like they are out of place.


I have tried a CIF file for exactly the same structure from another source and 
get an identical result, and I get similar results with other CIF files for 
other minerals.


Any advice on what I may be doing incorrectly, or how to get these structures 
to load blocks of unitcells correctly would be much appreciated.

I don't fully understand the various ways of loading cell ranges, so I guess 
that could be the problem, so any basic explanations of the sorts of commands 
that can be used would also be appreciated.

I wondered if it might be something to do with the symmetry operations in the 
CIF file not being interpreted correctly, but I'm not a crsytallographer so I 
need some help to put me on the right track.

sincerely,


steve















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