10 Types Of Kryptonite (Other Than Green) That You Need To Know About
4. White Kryptonite
White Kryptonite doesn’t harm Kryptonians or human beings. It’s a nice, pleasant, bright ore that - you'd think - wouldn't torment any living thing...
Except it kills all plant life, which is nice.
The white crystal first appeared in Adventure comics #279. In this issue, Superboy was thrown into the 50th century where he discovered people considered him to be a fictional character. Upon arriving he also learnt that an alien spore had landed on earth and was spreading rapidly. Superboy then used the white Kryptonian mineral to destroy the microscopic organism.
A later appearance of the meteor fragments came during its use on Perry White, who was infected with a parasite from an alien plant. Its most recent apperance came while Superman was infected with Virus X, a Kryptonian version of super leprosy. The White Kryptonite destroyed the bacteria of the virus and cured him completely, so it can't be that bad really, can it?