Name the hardest form of coal.
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Anthracite is the hardest form of coal.
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Anthracite
Anthracite is hard as it contain around 86percent carbon and few volatile impurities and moisture. It is the highest rank of coal, hardest, glossy black used primarily for residential and commercial space heating. It may be divided further into metaphorically altered bituminous coal and "petrified oil", as from the deposits in Pennsylvania.
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