Also known as Thomson structures, in honour of William Guglielmo Thomson who published his findings 4 years prior to Count Alois von Beckh Widmanstätten.

Widmanstätten structures refer to distinct pattern of nickel–iron crystal lattices that form in meteoroids as a result of the extremely slow cooling of molten metal that occurs in the vacuum of space.

Crystal structures, like these, that are large enough to see with the naked eye are extremely rare in metals found on earth.