Cor Lapis is one of the materials for leveling the hero in Genshin Impact.
There are places where you can collect a resource in a few minutes. First you need to go to the village of Minyun, which is located near the mouth of Tsionji on the map.
Once in this area, explore two positions:
There are tiny mines that contain ore. You need orange ore. You can mine it with a spear or a longsword, but using an explosion or a greatsword will get the ore much faster.