Eastern Mineral and Environmental Resources Science Center

Multimedia

Filter Total Items: 30
Image shows a sample of axinite against a black background
December 31, 2016

Axinite

This is a sample of axinite with iron, making it ferroaxinite. Axinite is primarily used as a collectors mineral.

Sample provided by Carlin Green, USGS. Sample originated from Puiva Mount, Russia, and is 3.0cm in size.

core mineral photomicrograph
December 31, 2016

Local Boy Drill Core - 1010 (microscope image)

Cross-polarized light photomicrograph of minerals in drill core samples from the Local Boy deposit, Duluth Complex, Minnesota. The number in the upper right hand corner is the drill core number.

Image shows a sample of azurite and malachite against a black background
December 31, 2016

Azurite and Malachite

A sample of azurite, the blue mineral, and malachite, the green mineral. Both azurite and malachite are copper minerals that were once used as pigments but are now mostly valued as collectors minerals. They do serve as good indicators of copper deposits that can be developed. Read more information about copper here.

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core mineral photomicrograph
December 31, 2016

Mesaba Deposit Drill Core (microscope image)

Cross-polarized light photomicrograph of minerals in drill core samples from the Mesaba copper-nickel deposit, Duluth Complex, Minnesota. The number in the upper right hand corner is the drill core number.

Image shows a sample of clinozoisite against a black background
December 31, 2016

Clinozoisite

This sample is clinozoisite, a calcium aluminum silicate mineral. It is mostly prized as a collectors mineral rather than a source of its industrial mineral commodities.

Sample provided by Carlin Green, USGS. Sample originated from Hachupa, Pakistan, and is 6.0cm in size.

SEM image of slag
December 31, 2016

Slag - Calumet Region (microscope image)

Scanning Electron Microscope backscatter image of legacy steelmaking slag from the Calumet region, Chicago, Illinois, showing silicate minerals, some of which may have acid-neutralizing potential.

Image shows a sample of elbaite on a black background
December 31, 2016

Elbaite

Elbaite is one of the best-known members of the tourmaline mineral family, particularly for its high-quality gemstones. Read more about the tourmaline mineral family here

Sample provided by Carlin Green, USGS. Sample originated from Himalaya Mine, California, and is 4

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scientists sampling water
December 31, 2016

Keeley Creek Sampling and Measurement

Scientists sampling water and measuring streamflow in Keeley Creek, a stream in northern Minnesota that is in the vicinity of copper-nickel-platinum group element deposits. 

Image shows a sample of epidote and quartz against a black background
December 31, 2016

Epidote and Quartz

Epidote is a silicate mineral used mostly as a semiprecious gemstone.

Sample provided by Carlin Green, USGS. Sample originated from Prince of Wales Island, Alaska, and is 6.0cm in size.

scientists collecting samples
December 31, 2016

Sampling Ironwood Iron-Formation

USGS scientists sampling​ the​ Ironwood Iron-Formation, Gogebic ​I​ron ​R​ange in northern Wisconsin.

Image shows a sample of pyrrhotite against a black background
December 31, 2016

Pyrrohtite

Pyrrhotite is an iron sulfide mineral related to iron pyrite, which is one of the minerals known as Fool's Gold. Pyrrhotite, although not one of the Fool's Gold minerals, is sometimes called magnetic pyrite as it is weakly magnetic. It is most valued as a collectors mineral.

Sample provided by Carlin Green, USGS. Sample originated from Eagle Mine, Michigan, and is 4

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scientists on outcrop
December 31, 2016

Ironwood Iron-Formation Outcrop

Scientists standing on an outcrop of the Ironwood Iron-Formation, Gogebic Iron Range in northern Wisconsin.