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Some of the more interestings forms of the element that has varying effects on Kryptonians
- Debut of Kryptonite, the element that weakens Superman first seen as a gemstone in the turban of a villain (although it does not appear to be the green color as we know it today)
- Origin of Superman retold
- 1st appearance of real Kryptonite with a green hue
- * in an earlier issue, Lex Luthor synthesized Kryptonite and it appeared green but it was not real Kryptonite)