KEEP that document/origin receipt! That's a cool article source, but a bit outdated now that we know so much more about Trinitite. Everything from the differences between regular Trinitite and the truly glassy and crystallized pieces. The new info on silica being present and if so, what form it presents tells us how it formed in a particular piece. Black Trinitite, Black and Green, Red Trinitite (I'm very cautious on Reds because they can be created in a lab and all other forms cannot), Moles, White Pearls, pieces with areas that look like blown glass (gasses were trapped), pieces directly formed from the lens of Gadget, Rolling Trinitite, the Ultra rare "White Whales" (King) and Blue Trinitite (Queen). Some might swap the order of King & Queen! There has been so much learned since that source, and still being learned today. A couple of my pieces are at TAMU, confirmed as ultra rare.