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Kryptonite is a fictional material from the Superman mythos: specifically the ore form of a radioactive element from Superman's home planet of Krypton. First mentioned in The Adventures of Superman radio show in June 1943, the material has featured in a variety of forms and colors (each with its own effect) in DC Comics publications and other merchandise, including feature films, television series, and novelty items such as toys and trading card sets.

The established premise is that Superman and other Kryptonian characters are susceptible to its radiation, which created usage of the term in popular culture: Kryptonite being a reference to an individual's perceived weakness, irrespective of its nature. To commemorate the 70th anniversary of Superman, the University of Leicester participated in a public relations exercise and presented the Geological Society with "mock kryptonite", termed krypton difluoride.

An unpublished 1940 story "The K-Metal from Krypton", by Superman co-creator Jerry Siegel featured a prototype version of kryptonite, being a mineral from the planet Krypton that drained Superman of his strength whilst giving humans superhuman powers.[3]

"Kryptonite" proper was introduced in the story arc "The Meteor from Krypton" in June 1943 on the Superman radio series. In 1949 kryptonite was incorporated into the comic mythos with issue #61 of Superman. In August 1993 pioneering female editor Dorothy Woolfolk stated in an interview with Florida newspaper Today that she had found Superman's invulnerability dull, and that DC's flagship hero might be more interesting with an Achilles' heel such as adverse reactions to a fragment of his home planet.

Kryptonite gradually appeared more frequently, causing science fiction writer Larry Niven to theorize in tongue-in-cheek fashion that Krypton was in fact a Dyson sphere, and that this was the underlying reason for so much of the mineral finding its way to Earth courtesy of meteor showers. In an effort to reduce the use of kryptonite in storylines, all known forms on Earth were transmuted into "k-iron" in a 1971 story arc titled "The Sandman Saga".

(http://en.wikipedia.org/wiki/Kryptonite)