So, the kryptonite story is old hat now. But the article made me wonder why the makers of Superman Returns used “sodium lithium boron silicate hydroxide” as the chemical formula for kryptonite when we already have an element named krypton (Kr), which they could easily have faked a compound name with. They missed a trick there. (Unless there’s some kosher DC Comic reason for it.)
akatsuki ra-ra-ra 
Well, krypton is an unreactive gas, so it would be pretty hard to make a mineral out of it. Then again, I doubt the average person would know, or would care.
True. That’s a bit of a bugger, isn’t it?
Kr compounds with Fluorine though to give KRF(2). Kryptonide?