Plate 8 



1. Henbury, Australia; medium octahedrite; Ni-Co 7.48-7.91 percent. Irregular Xeu- 

 mann lines. The specimen is a small flakelike mass that has suffered severe distortion; 

 in larger masses the structure of Henbury is regular. Picral 45 seconds; X 60. 



2. SeelXsgen, Prussia; coarsest octahedrite; Ni-Co 5.74 percent. Broad kamacite bands 

 between taenite lamellae. One set of Neumann lines crosses them without change of direc- 

 tion. Three other sets may be distinguished. Picral 60 seconds; X 60. 



3. Bendego, Brazil; coarse octahedrite; Ni 6.8 percent. Large kamacite grains with 

 Neumann lines crossing the grain boundaries (outlines of earlier gamma grains) without 

 interruption, as in many hexahedrites. Schreibersite bodies along grain boundaries and 

 many rhabdites. Picral 80 seconds; X 30. U. S. National Museum. 



4. Forsyth County, North Carolina; nickel-poor ataxite; Ni-Co 6.08 percent, P 0.23 per- 

 cent. Four sets of Neumann lines making angles of 45° and 90°. This is believed to be the 

 first observed example of Neumann lines in an iron of this class. The photograph shows 

 the general structure of the iron, kamacite with a profusion of rhabdites more or less altered 

 by reheating. The occurrence of Neumann lines is local. Picral 45 seconds; X 45. 



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