system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] Why did the dwarves not make weapons out of mithril?

The only reason I can think of is that mithril was incredibly rare, at least in the third age, and still very rare before then. Mithril was used for Frodo's chainmail and even helmets of the guard of Minas Tirith, but given its strong properties once forged, I wondered why the dwarves never used it to make insanely strong swords or axes.
gpt
Because dwarves usually depend on axes and hammers: weapons that use their weight to deal damage. Mithril is noted to be a very lightweight metal, practically like cloth. It just wouldn't have the weight needed for that kind of weapon.

So while it made a great defensive item, or perhaps a rapier or dagger, it wouldn't have the bite needed for a dwarven fighting style. They were not particularly graceful fighters, after all.

That said, it was mainly the elves that used mithril.