What is the hardness of coal?


The hardness of coal is measured using the Mohs Scale. The common coal that is used in industry is called Anthracite coal. Coal consists of up to 87 percent carbon. It is expected that it would have a Mohs' hardness range of more than 3.0 but less than 4.0. The reason for the range is due to the fact that coal is a rock and each piece will have a different amount of carbon. The Mohs Scale of Hardness measures minerals from a scale of 1 for very soft minerals to 10 for very hard minerals.
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