Images

A uranium-vanadate mineral in calcrete. This sample came from near the Sulfur Springs Draw in Texas. USGS conducted an assessment of uranium resources in this region in 2015.

Microscopic gold and lead particles surrounded by organic and phosphorus-rich material in a municipal biosolids sample (combined surface topography and atomic weight images).

Cinnabar mine site in Idaho.

An abandoned mine shaft in the Alabama Hills, California, located near the contact of the Alabama Hills Granite with metamorphic wall rock.

Figure 2. Bluish-gray elongate amphibole bundles found in samples of commercial expanded vermiculite ore from Libby.

The Concord heavy-mineral-sands mine of Iluka Resources in south-central Virginia.

Figure 3. Secondary electron images of elongate amphibole bundles from the sink fractions of commercial expanded vermiculite ore.

Photo showing intense acid-sulfate hydrothermal alteration on Red Mountain No. 2, Silverton CO. View is looking to the west across Corkscrew Gulch. 

Supergene Leached zone at Silver Bell Mine, AZ.

USGS photo of Ray Copper Mine in Pinal County, Arizona. Taken by Mark Coker on September 1, 2007. Revised for brightness and contrast for use as a webpage Carousel image.

Union for International Cancer Control (UICC) asbestos amosite standard.

Winchite-richterite asbestos, Colorado.

Diatom in spire from floor of Yellowstone Lake, Yellowstone National Park.

Spires from the floor of Yellowstone Lake appear to be composed of diatoms and silicified bacteria.

Aluminum x-ray intensity map of a high temperature inclusion from the Allende meteorite.

Spires from the floor of Yellowstone Lake appear to be composed of diatoms and silicified bacteria.

Photograph of ant taken with electron microscope.

Secondary electron image of dickite clay crystals.

Spires from the floor of Yellowstone Lake appear to be composed of diatoms and silicified bacteria.