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
A diamond
Diamond
Diamond
diamond is the hardest and graphite is the softest
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.