Corundum.
The diamond is the hardest rock (or mineral).
Corundum is a mineral, therefore it could not be the hardest rock.
The hardest substance in a rock would be the hardest mineral of which the rock is composed.
The hardest substance that is naturally occurring is a diamond. However, there are harder substances that have been made by scientists in labs.
Well, diamond is a mineral so it isn't any type of rock.Diamond is the hardest mineral on earth and a 10 on the 1-10 MOHZ hardness scale. It is 40-50 times harder than the next hardest rock, corundum which is 9 on the scale. So no, diamond is quite the very opposite of soft, and as previously stated, it is a mineral, not a rock.No, diamond is the hardest rock.
The hardest mineral is diamond, and the softest mineral is talc.
Diamond is the hardest mineral known.
Diamonds are the hardest mineral and the agate is the secod hardest mineral.
Diamond is the hardest mineral on earth.
Diamonds are the hardest mineral, but not the 'strongest'.
Hardest Mineral=Diamond Second would be corundum.etc. etc....but these are minerals. Rocks are a combination of at least 2 minerals. A hard "rock" would be nearly any mafic, igneous rock.
A diamond is the hardest mineral. A diamond can scratch all other minerals or rocks and cannot be scratched by another mineral or rock except another diamond.