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Coal is generally considered a sedimentary rock as it is made up of deposited material (in this case organic matter, mostly from plants) and is eventually covered up by overburden. I'm not going to go into the details of the physical change but the reason black coal might be considered metamorphic is that it has been subjected to more pressure over time which furthers the coalification process.

The order of coalification coal:

peat -> lignite (brown coal) ->sub bituminous -> bituminous ->anthracite (very rare)

everything after lignite is black in colour.

If you need this for a report I'd probably look it up though, its been a while since I've studied coal in depth.

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13y ago

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Why is coal still a rock?

It is a metamorphic rock . Also the coal is sometimes considered a sedimentary rock.


Is anthracite coal a sedimentary rock?

No. Anthracite coal is a metamorphic rock.


Is coal a igneouse rock?

No. It is considered a sedimentary rock, except for the variety anthracite, which is considered a metamorphic rock.


Is coal an igneous rock sedimentary rock or metamorphic 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.


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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.


Can coal be organic rock?

Yes, coal is considered an organic sedimentary rock. It is formed from the remains of plants and trees that have undergone a process of burial, decomposition, and carbonization over millions of years.


What metamorphic rocks is commly known as''coal''?

The coal variety anthracite is a metamorphic rock.


What kind of rock is an organic rock?

Anthracite could be considered an organic metamorphic rock as its protolith is bituminous coal, an organic sedimentary rock.


Is Anthracite coal igneous metamorphic or sedimentary?

Anthracite coal is a type of metamorphic rock. It forms from the transformation of bituminous coal under increased temperature and pressure over time.


Is coal metamorphic?

Most coal is sedimentary, but anthracite is bituminous coal that has undergone metamorphosis to become a metamorphic rock.


What is the parent rock for anthracite coal?

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