California's state rock, serpentinite, is formed deep in the ocean and gets its namesake from having a texture similar to a snake's skin.

Source: https://phys.org/news/2023-05-ridge-california-jewel-tribes.html

Metals such as chromium naturally exist in the environment, such as in rocks like serpentinite.

Source: https://alaskapublic.org/2023/12/19/a-known-carcinogen-is-showing-up-in-wildfire-ash-and-researchers-are-worried/