The hardest substance in a rock would be the hardest mineral of which the rock is composed.
The diamond is the hardest rock (or mineral).
the softest rock is talc and the hardest is a diamond
Corundum is a mineral, therefore it could not be the hardest rock.
The hardest rock is PANTERA, or Diamonds. Depending on your question.
Diorite is the second hardest rock in the worl - Vellond
The hardest substance that is naturally occurring is a diamond. However, there are harder substances that have been made by scientists in labs.
Diamonds are the hardest rock.
Corundum.
yes
yes
The harder rock is diamond