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Probably bituminous, the "middle grade" of coal. Lowest is lignite, which is usually only used in underdeveloped countries as it has low heat output and high pollution. Above bituminous is anthracite, an excellent, very hard (and very expensive) coal. When you ask most people to visualize a lump of coa in their mind, ninety to ninety-five percent of them will visualize bituminous.

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