Lignite (from Latin lignum 'wood'), 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 due to its relatively low heat content.
Lignite (from Latin lignum 'wood'), 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 due to its relatively low heat content.
Source: Wikipedia "Lignite" · CC BY-SA 4.0
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