Farnsworth: Indeed, you see that fossil was made of dolemite - the tough black mineral that won't cop out when there's heat all about! By contrast, observe the lava's effect on this ice swan.(Uses tongs to fetch an ice swan from the freezer and drops it into the lava) Of course that would have melted even at room temperature, I just wanted to get rid of it. But had it been made of that righteous mineral dolemite, theres a slim chance it might have survived.
Fry: So Seymour might still exist?
Farnsworth: Perhaps, for a few minutes. It's dolemite, baby!