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Coal
Coal is a readily combustible black or brownish-black sedimentary rock normally occurring in rock strata in layers or veins called coal beds. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. It is composed...
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Bituminous coal
Bituminous coal or black coal is a relatively soft coal containing a tarlike substance called bitumen. It is of higher quality than lignite coal but of poorer quality than anthracite coal.
Bituminous coal is an organic sedimentary rock formed by...
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Anthracite coal
Anthracite (Greek Ανθρακίτης, literally "a type of coal", from Anthrax [Άνθραξ], coal) is a hard, compact variety of mineral coal that has a high lustre. It has the highest carbon count and contains the fewest impurities of all coals, despite its...
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Sub-bituminous coal
Sub-bituminous coal is a type of coal whose properties range from those of lignite to those of bituminous coal and are used primarily as fuel for steam-electric power generation.
Sub-bituminous coals may be dull, dark brown to black, soft and...
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Cannel coal
Cannel coal, also known as candle coal, is a type of coal, also classified as terrestrial type oil shale, with a large amount of hydrogen, which burns easily with a bright light and leaves little ash.
Cannel coal consists of micrinites, macerals of...
