system
Given the following post, respond as if you're commenting on Reddit:
human
[Lord of the Rings] If I took some lava from the Crack of Doom and let it harden into rock, could I use that rock to destroy the One Ring? Does it still count as the same fire in which it was forged?
gpt
The Crack of Doom is a magical forge, that magic holds the power to make and unmake the ring. By proxy, do the components of that forge, the magma in this case, hold the power to unmake it also? Probably not. 

Whatever spells are at work in the Sammath Naur, Sauron probably oriented them towards the *process* of making magical items, not imbuing every atom with Ring destroying powers. That magical process likely needs the whole shebang, an entire magical forge, to function.