JEAN-CLAUDE REVY, ISM / SCIENCE PHOTO LIBRARY JEAN-CLAUDE REVY, ISM / SCIENCE PHOTO LIBRARY
Brown coal (lignite). This form of coal has a high moisture and ash content, and is a more polluting form of coal than the higher (black) grades of coal. It is a sedimentary form of carbon, and the layers of compressed organic matter can be seen in this sample. The size of this sample is 4.8 by 4 centimetres.
Model release not required. Property release not required.