Question

Why is diamond the hardest naturally occurring substance

Answer 1

The second, the mineral lonsdaleite, or hexagonal diamond is made from carbon atoms just like diamond, but they are arranged in a different shape. Only small amounts of wurtzite boron nitride and lonsdaleite exist naturally or have been made in the lab, so until now no one had realised their superior strength.

Answer 2

Diamond is the hardest naturally occurring substance because in this type of allotrope one atom of carbon is connected with 4 other atom and it does not have any lose electron.