Coal isnot what most geologists would consider metamorphic rock(with the possible exception of meta-anthracite,which is transitional with metamorphic rocks).
People also ask
Is coal a sedimentary rock or metamorphic rock?
Is coal a sedimentary or metamorphic rock? Because coal undergoes physical and chemical changes as a result of increased heat, there is sometimes a misconception that coal is a metamorphic rock. Coal is a sedimentary rock.
What are the three types of rocks in coal?
Of the three categories of rocks, sedimentary, igneous and metamorphic, sedimentary is the closest type that coal could fit into. Coal was not derived from molten material, so is not igneous by definition.
Can coal be metamorphosed into Anthracite?
Even coal can be metamorphosed; bituminous (soft) coal, a sedimentary rock, can be changed into anthracite, or hard coal. Anthracite can be found in the folded belts of rocks in the Appalachian Mountains, where temperatures and pressures of mountain building have caused these changes to occur.
Are high Rank Coals formed by metamorphic processes?
Confusion arises because high-rank coals are considered the product of processes termed low-grade burial metamorphism. Low-grade burial metamorphism is still below the level of temperature and pressure which forms typical metamorphic rocks (marble, quartzite, slate, etc.).