Lignite
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Lignite, often called 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
Lignite mining, western North Dakota, US (c. 1945)
Strip mining lignite at Tagebau Garzweiler in Germany
Lignite mine in the background of Lützerath, Germany
Layer of lignite for mining in Lom ČSA, Czech Republic
Bituminous coal
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Bituminous coal, or black coal, is a type of coal containing a tar-like substance called bitumen or asphalt. Its coloration can be black or sometimes dark brown; often there are well-defined bands of
Lignite
…However, its inherent moisture content is sometimes as high as 75 percent and its ash content ranges from 6–19 percent, compared with 6–12 percent for bituminous coal. As a result, its carbon content on the as-received basis (i.e., containing both inherent moisture and mineral matter) is typically just 25-35 percent…
Bituminous coal
Bituminous coal (Pikeville Formation, Middle Pennsylvanian, Kentucky, USA)
Primary coking coal
Rajpura Thermal Power Plant