Lignite - WikipediaLignite, often referred to as brown coal, is a soft, brown, combustible, sedimentary rock formed from naturally compressed peat. It is considered the lowest rank of coal due to its relatively low heat content. It has a carbon content around 60–70 percent. It is mined all around the world and is used almost exclusively as a fuel for.فحم الجفت browncoal النضج,Brown coal | coal classification | BritannicaIn Great Britain and other countries, the term brown coal is used to describe those low-rank coals (lignite and subbituminous coal) that generally have a brown . Many brown coals of lighter colour have a fibrous structure in which roots and other plant matter are still recognizable, indicating little coalification beyond peat.
فحم الجفت browncoal النضج