Nickel-iron crystals form a geometric pattern on the face of an octahedrite meteorite. The patterning is called Widmanstätten patterns after Count Alois von Beckh Widmanstätten, a director of the ...

Analysis of the dagger by the team confirmed the existence of iron sulfide which is commonly found in octahedrite. There were also signs that the metal had been heated to at least 800 degrees.