Kryptonite appears primarily in Superman stories published by DC Comics. In its best-known form, it is a green, crystalline material originating from Superman's home world of Krypton - Kryptonite radiation can be transmitted through any element except lead. "The Meteor of Kryptonite"
“More likely, kryptonite was introduced as a plot device for Superman to discover his origin.” https://en.m.wikipedia.org/wiki/Kryptonite
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