Anthracite

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

Anthracite, also known as hard coal and black coal, is a hard, compact variety of coal that has a submetallic lustre. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals.

Excerpt from the Wikipedia article “Anthracite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Amcyrus2012, CC BY 4.0, via Wikimedia Commons.