Hexahedrites are a class of nickel iron meteorites. They are about 6% nickel, and are composed almost entirely out of the iron nickel alloy kamacite.
After etching, Hexahedrites do not display a Widmanstätten pattern, but they do show Neumann lines, parallel lines that cross each other at various angles. They are named after Franz Ernst Neumann, who discovered them in 1848.
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