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The original rock to a metamorphic rock is called the protolith.
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.
Anthracite is metamorphosed bituminous coal and is a metamorphic rock.
Most coal is sedimentary, but anthracite is bituminous coal that has undergone metamorphosis to become a metamorphic rock.
Bituminous coal is considered a sedimentary rock and therefore would not be foliated or non-foliated, terms which are used to describe metamorphic rock.
Anthracite could be considered an organic metamorphic rock as its protolith is bituminous coal, an organic sedimentary rock.
Graphite is a foliated metamorphic rock originating from Bituminous Coal.
Anthracite is a metamorphic rock commonly called coal ,whose protolith or parent rock is bituminous coal.
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.
Anthracite, which is metamorphosed bituminous coal.
Bituminous coal is sedimentary! Bituminous coal is sedimentary!
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