1 It is recommended that beginners play an easier Difficulty first, before attempting hardcore mode. 2  Do not enter Caves unless prepared with at least iron Armor, a Sword and a Pickaxe.  Do not go to The Nether or The End unless totally prepared.
Tungsten Carbide Education: What is Tungsten Carbide. Tungsten carbide (WC) is durable and hard, it is four times harder than titanium, ten times harder than ceramic and twice as hard as stainless steel, so it cannot be resized.
Hafnium carbide cutting insert. This might be a hafnium carbide milling bit insert. Tungsten carbide inserts that look exactly like this are very common, and hafnium carbide is really hard too. Arguing in favor of its being hafnium carbide is the fact that it came in a box prominently labeled in several unmistakable ways as HfC: