Brown coal (lignite) is a soft brown combustible sedimentary rock

How is coal formed? - MiMaEd

Lignite - Wikipedia

Lignite (Brown Coal) - Geology Superstore

Coals, PDF, Coal

How is coal formed? - MiMaEd

Japan-Australia starts Producing Hydrogen from Brown Coal - GKToday

Coal Rock Type, Composition, Formation, Rank, Types & Uses

Illustration of the classification of coal types adapted from

Coal and petroleum