Smithsonian Report. 1942. — Henderson and Perry 



PLATE 2 



X- 





Hexahedrite Structures. 



Meteorites of this class are made up of a single alloy, kamacite; the parallel rulings are known as Neumann 



lines. 



a, Bennett County, S. Dak. In addition to the two prominent sets of Neumann lines there is a third set 

 making an angle of 85° with the nearly vertical lines. The dark elongated inclusion is troilite (sulphide of 

 iron). 6, the Negrillos mass of the North Chilean hexahedrite. The lower right-hand corner shows how 

 these Neumann lines often control the weathering or disintegration of the mass, as the iron separates along 

 these lines. Roimded inclusion of troilite interrupts some of the Neumann lines. 



