Hi Robert,
If you don't mind the crystals being rather small, then polyhedra crystals
might be what you're after (in fact, many microcrystals satisfy your
criteria). There is a mini review here:
http://dx.doi.org/10.1080/0889311X.2010.527964
These articles should also help.
Ji, X.; Sutton, G.; E
Dear CCP4 Community,
We are trying to find protein or virus crystals that diffract to reasonably
high resolution (2.5 Angstroms or better) and that are very radiation
sensitive at room temperature. "Very radiation sensitive" in this case
means that the diffraction dies after a few frames, for cry