How can you distinguish between sedimentary and metamorphic coal?

Answer 1

Anthracite coal is a metamorphic coal that has a higher luster than any sedimentary coals. It also has the highest carbon content. Otherwise it is very similar to sedimentary coal.

Diamond is commonly thought to be the metamorphism of coal but this is largely untrue as the immense majority (near 100%) of diamonds have nothing to do with coal.

Answer 2

Sedimentary coal is formed from the accumulation and compaction of plant remains, while metamorphic coal forms from the alteration of existing coal due to heat and pressure deep within the Earth's crust. Sedimentary coal typically has distinct layers and preserved plant structures, while metamorphic coal may have a more crystalline texture and lack the original plant features. Chemical and mineral composition differences can also help distinguish between the two types of coal.