A sharp and sizable cluster of betafite crystals, from the Silver Crater Mine. This locality has arguably produced the best crystals of this uranium bearing species, almost always outdoing those from Madagascar and Norway (which produced the only other examples you are likely to see) in terms of sharpness, size, and form.
This specimen was purchased from the field collectors who dug it up. Apparently they can't bring them over the US-Canada border any more, due to overzealous border patrol officers. Actually, I have heard more than a couple first hand stories form different collectors about officers who are not entirely familiar with the rules, getting a little too excited at having prevented the "next big terror attack" by catching someone crossing the border with "radioactive materials..."