Coal is a combustible black or brownish-black sedimentary rock, formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years. Coal is mostly carbon with variable amounts of other elements.
Locality - opencast coal mine, Pithouse West, South Yorkshire
© Peter Kennett
Hand specimen |
Locality |
Rock in use |
Close-up |
Thin section p-polars |