Neumann lines are found in some iron meteorites,
groups of very fine parallel lines that cross each other at various angles.
Irons containing Neumann lines can easily be cleaved in three mutually perpendicular
directions. They are named after their discoverer, the German crystallographer
and mathematical physicist Franz Ernst Neumann (1798–1895) who first
studied them in 1848.
|Neumann lines of a piece of the Sikhote-Alin