Gold kryptonite is a fictional mineral found in Superman comic books. A fragment of Superman's home planet of Krypton, gold kryptonite has been irradiated and is much more dangerous than traditional kryptonite. Gold kryptonite can permanently remove a Kryptonian's powers by blocking his ability to absorb yellow sunlight.
Gold kryptonite first appeared in Adventure Comics issue 299, released in August 1962. Because of its permanent effects, writers rarely used the material in the comics, presenting it only occasionally to present a grave threat to Superman's invulnerability. Unlike green kryptonite, gold kryptonite will not kill Kryptonians subjected to it but will only strip them of their powers.