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

Lignite coal on white background. Lignite is a soft, brown

Brown Coal Lignite Soft Brown Combustible Stock Photo 353526848

The Types of Coal: Composition, Usage, and Energy Value

Brown Coal Lignite Sedimentary Rock Formed Stock Photo 349913783

Coal and petroleum

Coal – IspatGuru

What type of rock is coal? - Quora

How is coal formed? - MiMaEd

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

Isolated Lignite Stone Isolated on White Background. Stock Image

Learning Geology: Coal