The hardest kind of rock in the world is the diamond. In fact, diamonds are the hardest naturally-occurring substance anywhere on Earth. Though they can also be considered a mineral, they can qualify as a rock as well because relatively large fragments of diamond occur normally in nature, without being mixed in with other minerals. On the Mohs scale for measuring the hardness of different minerals, diamond is assigned a value of 10 – the highest value possible.
Diamond is a mineral. If a rock consisted of nothing but diamonds, it would be a monomineralic rock, but such rocks are extremely rare if they occur at all. Rocks are aggregates of minerals.
One of the hardest rocks is emery, which is corundum (Hardness 9) and magnetite and little else.
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