I saw Alex Jones ranting about 'clean coal'. I think the distinction he was making was between anthracite and bituminous coal, implying anthracite is 100% carbon.
Quote:
Difference Between Anthracite Coal and Bituminous Coal ...
https://www.differencebetween.com/di...tuminous-coal/
Bituminous coal contains 77-87 % carbon, whereas anthracite coal contains more than 87% carbon. • Bituminous coal can be converted to anthracite with time. This process is known as anthracitization. • Bituminous coal is a sedimentary rock, whereas anthracite is a metamorphic rock.
The Differences between Bituminous Coal and Anthracite ...
The Differences between Bituminous Coal and Anthracite Coal | Actforlibraries.org
Anthracite and bituminous coal are two types of coal that are critical to the economy of the United States. Anthracite coal is used in a variety of manufacturing processes, but its primary use is in the formation of steel. Bituminous coal, on the other hand, is the type of coal most commonly used in America to produce electricity.
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Apparently bituminous coal has more BTUs, ...and is dirtier. So long as we're off-topic—