Diamond is incredibly hard but not very tough. Single crystals can be broken easily by an impact, such as striking them with a hammer or jamming a cutting tool too vigorously against the material being cut A naturally occurring polycrystalline diamond called carb is much tougher. Once General Electric had learned how to produce single crystals of diamond, they also figured out how to produce synthetic carbonado, which they named Compax. An alternate synthetic polycrystalline diamond called Megadiamond is produced by Megadiamond Industries in Provo. Utah. Polycrystalline diamond compacts have become important for the machining of non-iron-based metal alloys, polymers, and composites and also as surface coverings for industrial parts that must survive very challenging conditions of wear.