Question

What rock type is the hardest and what is the softest?

Answer 1

Hardest rock: Diamond. Although diamond is still considered the hardest, the bulk modulus of the metal osmium has recently been found to be 476 GPa.

Softest Rock: Sedimentary rocks form a thin layer of rock over 75 per cent of the Earth's surface.

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Answer 2

The softest rock would be Talc.


The hardest rock would be Diamond.