[Arkcon]

When I first heard of the mineral "kryptonite" being found on Yahoo news, I was confused as hell too. I didn't realize the reference to "sodium lithium boron silicate hydroxide" from one quick scene in one movie. I always figured kryptonite was the oxide, or sulfate or some chemical compound of -- well, some element that didn't exist on Earth at all.

Thing is thay can't formally name their new found mineral "kryptonite" Naming conventions would require it to be a compound based on the element krypton -- which it isn't.