[[1]] is the highest quality hard coal.

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Detailed Solution

Anthracite is a hard, compact kind of coal with a submetallic sheen, often known as hard coal. Anthracite is the finest quality hard coal. It is regarded as the highest-ranking coal since it has the most carbon, the fewest impurities, and the maximum energy density of all the other forms of coal. Anthracite, in contrast to other forms of coal, is typically regarded as a metamorphic rock. On a dry ash-free basis, it contains more than 87% carbon.

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