The hardest form of coal is _________________.

Name: The hardest form of coal is _________________.
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Anthracite is the hardest and the highest rank of coal with the most carbon content, making it extremely valuable for heating and energy production. Lignite has the lowest carbon content and is the softest form of coal, followed by sub-bituminous and bituminous coal. Peat is not considered a true form of coal as it has not undergone enough heat and pressure to become coal.

The Hardest Form of Coal Is _________________