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There are three main types of coal, and their formation depends on the amount of heat and pressure experienced by the original material. The lowest grade of coal, which experienced the least pressure and heat, is lignite or brown coal, and it contains the lowest amount of carbon and has the lowest heat value. The majority of coal found in the United States is bituminous, and it is also called soft coal and falls in the middle of the scale of carbon content and heat value. Anthracite, also known as hard coal, contains the highest amount of carbon and has the highest heat value.
Coal was first used for fuel in the 12th or 13th century in England when it was discovered that black rocks found on beaches could be burned...
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