Skip to main content
U.S. flag

An official website of the United States government

Pennington Mountain Rock with Critical Minerals

Detailed Description

A fine-grained volcanic rock (trachyte) that hosts rare earth elements, niobium, and zirconium, all which are considered critical mineral resources. This rock was found on Pennington Mountain in Maine. Image courtesy of Chunzeng Wang, University of Maine-Presque Isle.


Public Domain.