However, the real kryptonite does have the same chemical make up as the kryptonite in the story of Superman according to the scientists who discovered it.
Extraction is scheduled to begin in 2023, with a projected underground exploitability of 50 years. It was a mineral from the planet Krypton that drained Superman of his strength while giving superhuman powers to mortals.
Brainiac was hardly the only, or best known, word to have come from Superman; the comic is also the source of the word kryptonite. What is the most abundant mineral found in rocks at the earth's surface?
Clark Kent. Kal-El. Reconversion is here on the air as well as in industry, especially in “Superman” … So now he’s set to do thing with Kryptonite, more powerful than Uranium, with the problems of establishing peace in the world uppermost in his mind.Virginia Vale, The McHenry Plaindealer (McHenry, IL), 4 Oct. 1945. There are a good number of words in English that have come from comics.
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For the krypton-containing cation, see, Bill Finger (w), Al Pastino (p). 1965, As kryptonite takes on this broadened use, and is increasingly used to refer to the weakness of someone other than Superman, it mirrors the movement of a word that is often given as its synonym: Achilles’ heel. Product description Kryptonite Realtime GPS Based Security and Locating SystemLast year the number of motorcycle thefts in the U.S. grew to an astounding 56,000 bikes.
Alas, the fuddy-duddies of international mineral nomenclature insist that, since the stone doesn't actually contain the real-world element krypton, it can't be officially called kryptonite. Given that the above citation appears to use kryptonite in a context that is removed from the classic fictional universe inhabited by Superman it could appear to be a figurative use of the word. 'Nip it in the butt' or 'Nip it in the bud'.  Post-Crisis sources establish that green kryptonite is also harmful to humans; with sufficient long-term exposure, it can result in cancer, as Lex Luthor discovered, much to his dismay, from a ring with a green kryptonite jewel he wore to ward off Superman's presence..