Yes.
The hardest naturally occurring substance is called diamond. It is a form of carbon.
Diamond
Diamond use to be the hardest known natural substance now it is the mineral lonsdaleite at 58% stronger then diamond is the first the second hardest is wurtzite boron nitride at 18% stronger then diamonds they are both extreamly rare natural minerals sources http://www.newscientist.com/article/dn16610-diamond-no-longer-natures-hardest-material.html
Diamond. a very hard material that is the hardest substance ever, or at least discover to be the hardest substance on EARTH THAT IS
Diamond is the hardest substance in the world
diamond is the hardest and graphite is the softest
A diamond
Diamond
Diamond
The hardest substance that is naturally occurring is a diamond. However, there are harder substances that have been made by scientists in labs.
The hardest naturally occurring substance after diamond is lonsdaleite, also known as hexagonal diamond. It is a rare form of carbon with a hexagonal crystal structure that is even harder than regular diamond due to its unique arrangement of atoms.
Diamond is the hardest known substance.