No, Gold Kryptonite is not capable of killing Superman, in the Pre-Crisis Continuity while it is capable of taking away a Kryptonian's superhuman powers on a permanent basis it is also possible for Gold Kryptonite to cause some memory loss within an infected Kryptonian as well and in the Post-Crisis continuity while Gold Kryptonite still strips a Kryptonian's powers permanently it only works on Kryptonians that exist in the same reality of which it originated in.
kryptonite
Anyone who has kryptonite and exposes him to it.
Kryptonite
Kryponite can kill superman, Magic can too. But doomsday actually killed him but he came back. I hate superman though.
Metallo has tried in Superman/Batman: Public Enemies
Superman gave a piece of kryptonite to Batman to study, even though Batman tried to kill Superman with it during the Tower of Babel story arc.
Probably, she has almost the same forces as Superman.
Presumably any superhero could if they had Kryptonite.
Kryptonite is Superman's weakness.
If you have kryptonite and manage to keep him exposed to it for a very long time.
If we're assuming you can't kill Superman without Kryptonite, then no, because the X-men don't have anything at all related to Kryptonite.
it depends, if he is close to it, it will make him sick. if he touches it, he will be easy to kill for a short period of time, and if he is constantly exposed to it for a long time, it "WILL KILL HIM"