Why is coal not a mineral?

Coal is not classified as a mineral because it is made from organic materials.

Explanation:

Coal is produced from decomposed organic plants. Although rocks are made from inorganic material like minerals, coal is however, classified as an organic sedimentary rock.

Minerals are produced from combined elements. It is formed naturally by a specific chemical combination. Minerals include beryl, pyrite, diamond, and azurite. Minerals are inorganic.