Question

when coal gets extremely metamorphosis it turns into​

Answer 1

$\fbox\pink{A}\fbox\blue{n}\fbox\purple{s}\fbox\green{w}\fbox\red{e}\fbox\orange{r}$Even coal can be metamorphosed; bituminous (soft) coal, a sedimentary rock, can be changed into anthracite, or hard coal. ... Different grades of metamorphism are demonstrated when a shale is subjected to increasingly greater pressure and heat - first it becomes slate, then phyllite, then schist, and finally, gneiss.

Answer 2

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.

Coal is altered through biological and burial-thermal processes into different ranks. Many sedimentary rocks are also altered through burial-thermal processes (increasing cementation, etc.). Coal is not what most geologists would consider metamorphic rock (with the possible exception of meta-anthracite, which is transitional with metamorphic rocks). 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.).

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