Answer: Coal is not classified as a mineral because it is made of dead plants and is not well-defined Coal is a brownish-black flammable and sedimentary rock that is found in the form of seams. It is mainly made up of carbon with different proportions of elements like hydrogen is a mineral. As an inorganic rock found deep beneath the Earth it more than qualifies. Some "scientist" held a presser way back when and showed ignorant reporters a piece of coal bearing an imprint of a leaf such as in these photos: I …Why is coal not a mineral? Coal isn't; inorganic
