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kryptonite :

The term used to designate any surviving fragment of the exploded planet Krypton, home world of Superman.

There are five distinct varieties of(green, red, gold, blue, and white), the first three of which are toxic to Superman.

*Green kryptonite, the only variety potentially fatal to Superman, induces lassitude and inertia followed by death if not removed in time from Superman's presence. It is also the most common.

*Red kryptonite inflicts bizarre and unpredictable - albeit temporary and nonfatal - symptoms, as when it divides Superman into twins or transforms him into an infant or a giant ant.

*Gold kryptonite would permanently rob Superman of his super-powers were he ever to be exposed to its radiations.

These three varieties of kryptonite are similarly hazardous to Supergirl, Krypto the Superdog, and all other surviving natives of Krypton.

*Blue kryptonite is toxic only to Bizarro creatures.

*White kryptonite is harmful only to plant life.