DCMatt, its Iron, looks like some hammer marks along it, especially towards the broken end. Tip, its a bit sharp at that end, maybe a slight bevel indicating an "edge". i dont see any signs of it being broken off or a point missing and it appears as though thats the shape of that particular end. Maybe had a wooden surround to it where it was knocked into? Would definitely do some damage if someone came at you with it.
I will give it some more cleaning tomorrow and get a better look at it. Its an interesting piece though.