Define Brown Coal.
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Brown coal, also known as lignite, is a type of coal that is considered the lowest rank in the coal classification system. It is characterized by its brown color, high moisture content (often 30-70%), and relatively low carbon content (about 25-35%). Brown coal is primarily used for electricity generation and as a fuel for industrial processes. Due to its high moisture and low energy content, it has a lower heating value compared to higher ranks of coal like bituminous and anthracite.