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Bituminous Coal

2013 (approx.)

Detailed Description

This sample is of bituminous coal, a middle rank coal (between subbituminous and anthracite) formed by additional pressure and heat on lignite. Usually has a high Btu value and may be referred to as "soft coal." Read more about USGS coal research here: https://www.usgs.gov/centers/cersc/science/us-coal-resources-and-reserves-assessment

Sources/Usage

Public Domain.

Public Domain