The White Iron Chunk can be found all over Teyvat starting from Mondstadt to Liyue. In the interactive map of the game appear the siege where it is.
These are the two best places for farn, where you will get several pieces of white iron, one is on the left southeast of Mondstadt Castle and one on the right between Wuwang Hill and Dawn Winery.
After reading this guide on how to get white iron chunk in Genshin Impact, we hope you can find this mineral and be able to use it in the game to create everything you can with it.