What Is the Hardness of Coal?

Generally, the higher the value on the Moh's scale, the harder the material. The Moh's hardness is generally too subjective for anthracite since it does not have a completely uniform internal structure and might be harder or softer in different spots. For example, when a piece of coal fractures, it appears to be softer. The hardest mineral on the scale is the diamond, while the softest is talc.