It will take those users a few attacks to break it, meaning that non-Claymore or Geo users will struggle to break it open.
On average, you can find 3 jades in the mine quickly.
Noctilucous Jade is an important, but rare, resource that you will need to have for certain weapons and character ascensions.
Check it out and make sure to bookmark it for later use.
He will sell Iron Chunks, White Iron Chunks, and Noctilucous Jade.
Use these for plunging attacks.
Used as a character ascension material, Noctilucous Jades are a local specialty of Liyue, and can be found at the base of mountains and can easily be spotted due to their bright blue-looking node.
As a bonus, you will also find Geo Crystal flies here.