Energy and Minerals

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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.

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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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.

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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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.

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

Torbernite

Torbernite is a copper phosphate mineral that contains uranium, making it somewhat radioactive. Although it can be used as a uranium ore, it's more valued as a collectors mineral. It can be used as a good indicator of uranium deposits, however.

Sample provided by Carlin Green, USGS. Sample originated from Musonoi Mine, Democratic Republic of the Congo, and is 5.0cm

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Image shows a sample of Apophyllite and Prehnite on a black background
December 31, 2016

Sample of Apophyllite and Prehnite

These two minerals are apophyllite and prehnite. Both apophyllite, the clear crystals, and prehnite, the green mineral, are primarily prized as collectors minerals. 

Sample provided by Carlin Green, USGS. Sample originated from Virginia Crushed Stone Quarry, Virginia, and is 4.6cm in size.

Image shows a large black stone with a silver sign in front
July 20, 2016

Cannel Coal

Cannel coal is a type of bituminous coal, which is the second-highest rank of coal (just behind anthracite). This particular sample has a high carbon content with high pollen and spore content as well. Unlike most bituminous coal, Cannel coal can be carved into ornaments. This sample came from the Eastern Interior Coalfield in Kentucky.

Image shows a tall, triangular gray stone surrounded by grass and trees
July 20, 2016

Barre Granite

Granite is an igneous rock that we’ve used for building materials for thousands of years. It’s name comes from the Latin word “granum,” meaning “grain,” which refers to the grains of quartz and feldspar that define granite. This one is from the Barre formation in Vermont.

Attribution: Energy and Minerals
Image shows four men in visibility gear and hard hats at a coal mine
June 30, 2016

The USGS Coal Assessment Project

Coal project personnel visiting Trapper Mine in northwest Colorado in June, 2016.

Mostly beige rock with lots of round orbs contained within its matrix.
June 14, 2016

Phosphorite rock

Phosphorite rock formed on the seafloor in Southern California.