The Book of Lost Tales
Angrist (Sindarin: "Iron-cleaver") was a knife made by the great weaponsmith Telchar of Nogrod, and borne by Curufin. Beren, who had taken it from Curufin, used it to cut a magical Silmaril jewel out of Morgoth's Iron Crown; as Beren attempted to remove another, the knife snapped. In the earliest version of Beren's story in "The Book of Lost Tales", he uses an ordinary household knife; the element of Curufin's involvement in Beren's affairs came later.