SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 110, NO. 12, PL. 2 



I. Octahedrite. The black veins are fractures filled with what is believed to be fused 

 oxide forced into the fractures during flight. The hole is a deep surface depression with 

 weathered oxide irregularly distributed around the rim. ."Kbout .' natural size. 



,^-**l?5V,/«*''. 



'***.. 



2. .\n irregular body of tacnite with a core of dense untransformed gamma-alpha aggregate 

 showing an acicular structure with some orientation. The taenite outside of the dark core 

 is mostly clear and fully transformed, but where it adjoins the surrounding kaniacite it is 

 gray at many points because of supersaturation with respect to kamacite. The taenite 

 area encloses short needles (lamellae) of kamacite, and (at right) a large body of kamacite. 

 Picral 30 seconds X 65. 



