Diamond

 

This mineral is the hardest natural substance known. It is formed deep in the mantle and is brought to the surface through kimberlite pipes. The name comes from the Greek adamas meaning “invincible”. It was first found in India where it remained virtually their only source until it was discovered in Brazil in 1725. It is one of the most important gemstones.

Mineral Photos courtesy of R.Weller/Cochise College