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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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∙ 11y ago
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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.
Is Anthracite coal igneous metamorphic or sedimentary?
Anthracite Coal is a metamorphic rock.
Is coal metamorphic?
Most coal is sedimentary, but anthracite is bituminous coal that has undergone metamorphosis to become a metamorphic rock.
What metamorphic rock is commonly known as coal?
Anthracite is a metamorphic rock commonly called coal ,whose protolith or parent rock is bituminous coal.
What is a metamorphic rock that has parallel alignment of mineral grains?
A folliated texture metamorphic rock, like shist.
Why is coal not considered to be a rock?
Coal is considered a sedimentary rock, except for Anthracite which is considered a metamorphic rock.
Can coal be organic rock?
Coal is considered an organic sedimentary rock, except for anthracite which is considered a metamorphic rock.
Why is coal still a rock?
It is a metamorphic rock . Also the coal is sometimes considered a sedimentary 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.
Is coal a igneouse rock?
No. It is considered a sedimentary rock, except for the variety anthracite, which is considered a metamorphic rock.
What metamorphic rock does anthracite coal turn in to?
Anthracite coal is already a metamorphic rock.
What rock group does coal belong to?
Anthracite coal is considered metamorphic. All other types are sedimentary.
Is coal 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.
Is Anthracite coal igneous metamorphic or sedimentary?
Anthracite Coal is a metamorphic rock.
Is anthracite coal a sedimentary rock?
Yes, anthracite coal is a type of coal that is considered a metamorphic rock, not a sedimentary rock. It forms from the metamorphism of bituminous coal at high pressures and temperatures.
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.
What metamorphic rocks is commly known as''coal''?
The coal variety anthracite is a metamorphic rock.
