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lignite
Lignite is characterized by its low energy density and high moisture content, making it less efficient than anthracite or bituminous coal. It is often referred to as brown coal due to its distinct coloration and organic composition, which reflects its position as a transitional stage in the coalification process.
As a mass noun representing a geological material, it is treated as uncountable. To refer to specific quantities or types of this mineral, speakers must use partitive constructions such as a deposit of lignite or a seam of lignite.