Question

Which of these rocks is the hardest?

Answer 1

Out of these three rocks, diamond is the hardest. It has a rating of 10 on the Mohs scale of mineral hardness, while quartz has a rating of 7 and feldspar has a rating of 6.

Answer 2

It is difficult to determine which rock is the hardest without proper testing and comparison. However, generally speaking, diamonds are considered the hardest rocks with a ranking of 10 on the Mohs hardness scale. Other tough rocks include quartz, topaz, and corundum.

Answer 3

The hardest of these rocks is diamond. Diamond is a type of crystalline carbon that is the hardest natural substance known. It is formed under high pressure and temperature, and is often used in jewelry and other decorative items.