CuSO4.5H2O is the mineral chalcanthite, so you can get the atomic
coordinates from the very useful Russian site www-minCryst
<http://database.iem.ac.ru/mincryst/>. There are a lot of common inorganics
that appear as minerals: if you're not familiar with the names, check
<http://webmineral.com/> and
<http://un2sg4.unige.ch/athena/mineral/mineral.html>, which are the best two
mineral indexes.
Don't forget the possibility of showing the crystal forms - see links in
webmineral.com, but I can't follow the one to Georges Favreau's FACES
software. (It's available from
<http://leregne.citeweb.net/english/soft.htm> )
David Beveridge
