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PROCEEDINGS OF THE NATIONAL MUSEUM 



sion of being granulated. No taenite lamellae or plessite is visible, 

 though the microstriicture shows occasional minute atypical plessite 

 fields with a diversity of structure (pi. 21, fig. 2; pi. 22, figs. 1, 2) and 

 occasional small schreibersite bodies. A few small thin scales believed 

 to be taenite were found attached to the kamacite when the silicate 

 inclusions were broken out for study. No rhabdites were observed. 

 There are veinlets of silicates separating some of the kamacite areas, 

 and in several cases these extend from one silicate area to another, 

 but always around the edges of a kamacite boundary. 



The most distinctive feature of this meteorite is the silicate in- 

 clusions. These are numerous, colored black wnth carbon, and of 

 irregular shapes, usually elongated or sprangling, with dimensions 

 up to 2 inches or more. The bodies of the inclusions in many places 

 extend into the octahedral structure as black irregular veins or lines, 

 often of considerable length, and resemble cracks invaded by iron 

 hydroxide. Actually little hydroxide is present except around the 

 edges of the slice close to the outer surface. Occasional particles 

 of silicates are found in the kamacite inclosed in the silicate areas. 

 The structure of the iron indicates that the inclusions segregated be- 

 fore the octahedral structure was fully established. There are, how- 

 ever, some small rounded or irregular-shaped masses of iron appar- 

 ently isolated within the silicate areas. Although these appear, in 

 the section cut, to be islands of iron, they may be little tongues of 

 metal projecting into the silicate areas from the underside of the 

 inclusion. 



To provide a sample for study a slice was cut and etched, and from 

 this slice areas of iron were selected which were free from inclusions. 

 Likewise, portions rich in silicates were cut out to yield suitable mate- 

 rial for a study of these inclusions. 



COMPARISON OP THE LINWOOD, EL BURRO, AND MURNPEOWIE METEORITES 



