system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why is the Darksaber black?

Lightsaber colors typically respond to their respective Kyber crystal's colors. However, there does not seem to be a naturally occurring black Kyber crystal. What, then, explains the unique color of the Darksaber?
gpt
It's currently unknown but likely stems from a unique step in it's creation. It was created by a mandalorian Jedi long ago who may have brought materials native to mandalore or employed mandalorian smithing techniques in it's creation that have never been replicated. It also could be using something other than a kyber crystal as a focusing lense.