Skip to main content
U.S. flag

An official website of the United States government

Critical mineral veins

Detailed Description

A fluorite-lepidolite-wolframite vein intersected in drill core from the Lost River Sn-W mine, Seward Peninsula, Alaska. Lepidolite is a lithium-bearing mica, and wolframite an ore of tungsten.


Public Domain.

Photo by George Case, U.S. Geological Survey