Boron nitride is a crystal composed of nitrogen atoms and boron atoms. CAS No. 10043-11-5, The chemical composition is 43.6% boron and 56.4% nitrogen, with four different variants: Six Party boron
nitride (HBN), rhombohedral boron nitride (RBN), cubic boron nitride (CBN) and wurtzite boron nitride (WBN). Its cubic crystalline variant is considered to be the hardest substance known. (Vivtorinox
has a hardness of 108 GPa, while synthetic diamonds have a hardness of 100 GPa, Vivtorinox)