Plate 47 



1. Apoala, Mexico; described by Cohen as a fine octahedrite; no analysis. A t}-pical 

 nodule of troilite surrounded by a band of swathing kamacite. At the upper left are two 

 parallel Reichenbach lamellae about an inch long, their direction unrelated to the general 

 octahedral pattern. Macroetch; X IV5, ordinary light. 



2. MoNAHANS, Texas; nickel-rich ataxite; Ni-Co 11.51 percent. Part of a large troilite 

 inclusion with interface of swathing kamacite. The latter might be mistaken for schreiber- 

 site, but etching with neutral sodium picrate proves it to be kamacite. Picral 60 seconds; 

 X 30. 



3. Walker County, Alabama; hexahedrite; Ni-Co 5.94 percent, P 0.28 percent. An 

 inclusion of troilite surrounded by a zone of clear kamacite, corresponding with the swathing 

 kamacite in octahedrites. The zone is virtually free from the rhabdites and phosphide 

 particles, which are abundant elsewhere, but is traversed by the same Neumann lines as 

 the surrounding mass. Picral; X 60. 



4. Breece, New Mexico; medium octahedrite. An example of Reichenbach lamellae 

 remarkable for their fineness and regularity. (Usually they are thicker, more or less irregu- 

 lar, and less perfectly oriented.) The lamellae running from lower left to upper right happen 

 to be parallel with one set of kamacite bands. Macroetch; X l]i, ordinary light. 



167 



