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What is the hardness of the lignite grade of coal?

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What is the hardness of the lignite grade of coal?

(a) 0.5

(b) 2.5

(c) 5.5

(d) 9

The question was asked during an online interview.

Origin of the question is Important Sedimentary Rocks in section The Study of Rocks of Engineering Geology

1 Answer

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The correct choice is (b) 2.5

To elaborate: Lignite is compact and massive in structure with an upper specific gravity of 1.5 and hardness of 2.5 on Mohs’ scale of hardness. Some varieties of lignite may still show to a good extent the traces of original vegetable structure.

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