It is a metamorphic rock . Also the coal is sometimes considered a sedimentary rock.
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No. Anthracite coal is a metamorphic rock.
Coal is a form of rock. It is an organically formed sedimentary rock.
Peat (not much of a rock).
Coal is classified as a sedimentary rock.
Bituminous coal is consided a sedimentary rock. Anthracite coal is bituminous coal that has been metamorphosed by great pressure and heat and is considered a metamorphic rock.
Coal when subject to mild metamorphism turns into Anthracite, in which the carbon content is between 92% and 98%. If squeezed and heated still further, the coal will transform into graphite and of cause if the taken to extremes diamond will be produced, but that would require the coal to be taken deep into the earth's mantle.
Coal is a sedimentary rock. However, harder forms of coal, because of exposure to elevated temperature and pressure, are metamorphic rock.
Coal still in the ground is called "coal reserves".
Coal that is still in the ground is referred to as coal seam or coal deposit.
Coal forms from the remains of plants that have been buried in Earth's crust for millions of years. Over time, heat and pressure from the layers of rock above it compress the plant material, forming coal. This process of transformation from plant material to coal is part of the rock cycle, as coal is a type of sedimentary rock.
there is not a certain size a coal rock can be because they come in all sizes.