There are loads of different reasons for the variety of kryptonite:
Green K is fragments of the planet Krypton
Red K is radiated Green K
Black K is supposedly superheated Green K
Blue K is the Bizarro duplication of Green K
Silver K was created by Brainiac
Jewel Kryptonite is found in the Jewel Mountains of the Phantom Zone
X-K was created artificially by Supergirl
Slow K was created by Metallo
Magno K was created by Nero
Magic K was enchanted Green K
- As far as I can tell, there is no indication of the origins of other forms of kryptonite
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