Bokan Mountain, Alaska.
Images
Figure 1. Photographs of commercial, expanded vermiculite ore from the four major historical sources: Libby, Montana; Palabora, South Africa; Louisa, Virginia; and Enoree, South Carolina. Scale of the rightmost image in each set is the same as the left image unless otherwise labeled.
Figure 1. Photographs of commercial, expanded vermiculite ore from the four major historical sources: Libby, Montana; Palabora, South Africa; Louisa, Virginia; and Enoree, South Carolina. Scale of the rightmost image in each set is the same as the left image unless otherwise labeled.
Monazite grains with rare earth elements lanthenum, cerium and neodinium are associated with zirconium, pyrite and potassium feldspar. Mineral identification performed by a combination of scanning of electron microscopy (SEM) and electron microprobe.
Monazite grains with rare earth elements lanthenum, cerium and neodinium are associated with zirconium, pyrite and potassium feldspar. Mineral identification performed by a combination of scanning of electron microscopy (SEM) and electron microprobe.
USGS scientist David Fey walking through the Eureka Graben in the Silverton caldera complex.
USGS scientist David Fey walking through the Eureka Graben in the Silverton caldera complex.
Layered deposit of unconsolidated heavy mineral sands along the shores of Folly Beach, South Carolina.
Layered deposit of unconsolidated heavy mineral sands along the shores of Folly Beach, South Carolina.
Intensely altered propylitic rocks (red and yellow) in the Red Mountain mining district, overprinting the regional, propylitically altered igneous rocks (grayish-green), peaks at top of image. View to west.
Intensely altered propylitic rocks (red and yellow) in the Red Mountain mining district, overprinting the regional, propylitically altered igneous rocks (grayish-green), peaks at top of image. View to west.
Sample of eudialyte (pink) within layered vein consisting of quartz, albite, and sodic amphibole, Dora Bay, Alaska. Size of sample is 11 by 9 cm. Sample of coarse-grained, tabular bastnäsite within matrix of ferruginous dolomite, Birthday Claim, Mountain Pass, California. Photographs by Philip Verplanck, U.S. Geological Survey. SIR 2010-5070-J
Sample of eudialyte (pink) within layered vein consisting of quartz, albite, and sodic amphibole, Dora Bay, Alaska. Size of sample is 11 by 9 cm. Sample of coarse-grained, tabular bastnäsite within matrix of ferruginous dolomite, Birthday Claim, Mountain Pass, California. Photographs by Philip Verplanck, U.S. Geological Survey. SIR 2010-5070-J
A sample of finchite, a newly discovered uranium mineral. Finchite is the yellow material on the surface of the rock. Finchite is found in the late Pleistocene sediments deposited during the Illinoian glacial stage.
A sample of finchite, a newly discovered uranium mineral. Finchite is the yellow material on the surface of the rock. Finchite is found in the late Pleistocene sediments deposited during the Illinoian glacial stage.
Between Lamesa and Big Spring, Texas, runs the Sulfur Spring Draw, a dry creek. It's the site of an economic calcrete-type uranium deposit, the Sulfur Springs Draw Deposit, where a new mineral was discovered in 2015.
Between Lamesa and Big Spring, Texas, runs the Sulfur Spring Draw, a dry creek. It's the site of an economic calcrete-type uranium deposit, the Sulfur Springs Draw Deposit, where a new mineral was discovered in 2015.
The Southern High Plains of New Mexico, Oklahoma, and Texas. USGS conducted a uranium assessment in this region in 2015.
The Southern High Plains of New Mexico, Oklahoma, and Texas. USGS conducted a uranium assessment in this region in 2015.
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.
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).
Microscopic gold and lead particles surrounded by organic and phosphorus-rich material in a municipal biosolids sample (combined surface topography and atomic weight images).
A sample of finchite, a newly discovered uranium mineral. Finchite is the yellow material on the surface of the rock. Finchite is found in the late Pleistocene sediments deposited during the Illinoian glacial stage.
A sample of finchite, a newly discovered uranium mineral. Finchite is the yellow material on the surface of the rock. Finchite is found in the late Pleistocene sediments deposited during the Illinoian glacial stage.
USGS scientist Bradley Van Gosen examines rock layers for the newly discovered mineral finchite near Lamesa, Texas.
USGS scientist Bradley Van Gosen examines rock layers for the newly discovered mineral finchite near Lamesa, Texas.
A scanning electron microscope image of the newly discovered mineral finchite. The Denver Microbeam Lab provided this scan of finchite in order to help describe and identify the mineral as a new one. Finchite is a uranium mineral first observed in Martin County, Texas.
A scanning electron microscope image of the newly discovered mineral finchite. The Denver Microbeam Lab provided this scan of finchite in order to help describe and identify the mineral as a new one. Finchite is a uranium mineral first observed in Martin County, Texas.
A calcrete outcropping near Sulfur Springs Draw in Texas. This deposit dates to the Pliocene and Pleistocene, and hosts uranium-vanadate minerals.
A calcrete outcropping near Sulfur Springs Draw in Texas. This deposit dates to the Pliocene and Pleistocene, and hosts uranium-vanadate minerals.
The Southern High Plains of New Mexico, Oklahoma, and Texas. USGS conducted a uranium assessment in this region in 2015.
The Southern High Plains of New Mexico, Oklahoma, and Texas. USGS conducted a uranium assessment in this region in 2015.
Figure 2. Bluish-gray elongate amphibole bundles found in samples of commercial expanded vermiculite ore from Libby.
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.
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.
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.
Photo showing intense acid-sulfate hydrothermal alteration on Red Mountain No. 2, Silverton CO. View is looking to the west across Corkscrew Gulch.