I do have an illegal collection of a few small pieces of trinitite at home. Trinitite is the glass that was formed by the heat and pressure of the blast on the surrounding soil. Most was removed, but many pieces remain scattered on the ground. You're not supposed to collect it since it still is radioactive, but I'm a geologist, damnit! I have a few pieces in a small jar surrounded by large specimens of galena (lead).
Any NM furs reading this are welcome to tag along on Oct 1. I'll be posting specifics on the NM Furry list. Even if I can't fursuit I would still like to go for another visit.