Answer: lignite
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Lignite often referred to as brown coal is a soft brown combustible sedimentary rock formed from naturally compressed peat.It has a carbon content around 25–35% and is considered the lowest rank of coal due to its relatively low heat content.
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Lignite has the lowest ranking in the coal classification system and it is mostly used as fuel in the power sector. Lignite s colour ranges from brown to black (see Figure 2.7) and its heating value is less than 19.306 KJ/Kg. Due to the fact that lignite deposits are geologically young they may contain plant debris.
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Lignite generally yellow to dark brown or rarely black coal that formed from peat at shallow depths and temperatures lower than 100 °C (212 °F). It is the first product of coalification and is intermediate between peat and subbituminous coal according to the coal classification used in the United
Lignite : Lignite coal aka brown coal is the lowest grade coal with ...