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Coal is primarily composed of organic matter derived from plants and is classified as an organic sedimentary rock.
Coal is primarily composed of organic matter, derived from plants that died and were buried, then subjected to high temperatures and pressures over millions of years. It is a sedimentary rock made up of complex carbon and hydrocarbon compounds, with various elements mixed in like sulfur and nitrogen.
Coal is classified into different types or ranks based on the percentage of carbon and heating value, such as anthracite and lignite. While often associated with clastic rocks, coal itself is an organic sedimentary rock, not a mineral, due to its formation from the remains of living organisms.
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