Plate 56 



1. Fort Duncan, Texas; hexahedrite; Ni-Co 5.89 percent, P 0.23 percent. A rhomboidal 

 schreibersite body with a spot of kamacite in the center, a form occasionally observed in 

 hexahedrites. Rhabdites, abundant elsewhere, are absent near the inclusion. The picrate 

 stain produces a reticulated appearance. Light picral and 5 minutes neutral sodium pic- 

 rate; X 60. U. S. National Museum. 



2. Fort Duncan. Part of the area shown in figure 1, X 600. 



3. Pine River, Wisconsin; an undescribed iron that may be provisionally classified as an 

 atypical coarsest octahedrite with accessory silicates. Area of kamacite containing phosphide 

 the picrate stain has formed a reticulated pattern. The pellicle of stain is easily dislodged, 

 the touch of a needle point having broken away small portions producing white spots. 

 The black areas are silicate. Light picral and 5 minutes neutral sodium picrate; X 120. 



4. Pine River. Part of an area similar to figure 3. Light picral and 5 minutes neutral 

 sodium picrate; X L50. 



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