What is the hardest rock?

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ANSWER #1 of 2

My chemical romance ;-;


ANSWER #2 of 2

Diamond was once thought to be the hardest and the most incompressible material on earth, either natural or man-made. Although diamond is still considered the hardest, the bulk modulus of the metal osmium has recently been found to be 476 GPa.

What is the hardest rock?

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