Mineralogy
Coal is a combustible black or brownish-black sedimentary rock formed from the accumulation and preservation of plant materials, primarily in swampy environments. It is classified as a fossil fuel and is primarily used as a source of energy for electricity generation and industrial processes. The formation of coal involves multiple stages, including peat accumulation, compaction, and carbonization, which transform plant material into various types of coal, such as lignite, bituminous, and anthracite.
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