Plate 4 



1. Santa Luzia de Goyaz, Brazil; coarsest octahedrite. An example of strongly devel- 

 oped Neumann lines at low magnification. This iron is transitional between hexahedrites 

 and octahedrites, and the structure here shown is duplicated in a number of irons classed 

 as granular hexahedrites or coarsest octahedrites. Compare plates 1 and 2. Macroetch; 

 X l)'^, ordinary light. 



2. ScoTTSviLLE, Kentucky; hexahedrite; Ni-Co 6.28 percent, P 0.23 percent. An unusual 

 profusion of Neumann lines. Six sets are easily distinguished, with one short line in a 

 seventh direction (about 2 cm. long near the center of the upper half of the photograph). 

 A little below it there is a trace of another short line parallel with it. This area is almost 

 free from inclusions of phosphide, which in other parts of the iron are abundant. Picral; 

 X 60. U. S. National Museum. 



3. ScoTTSViLLE. Peculiar localization of Neumann lines. Four sets can be distinguished. 

 Picral; X 60. 



4. Cedartown, Georgia; hexahedrite; Ni-Co 5.80 percent. Large grains with Neumann 

 lines diversely oriented. Other parts of this iron show no grains and the lines are parallel 

 and uninterrupted. Picral; X 90. 



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