E. E. Howell — Ainsworth Meteorite. 



107 



as a whole are irregularly shaped segregations of troilite, in 

 forms suggesting graphic characters. These troilite areas contain 

 more or less carbon with grains of nickel-iron and phosphide of 

 iron and they are commonly bounded with a thin wall of schrei- 

 bersite. This compound also appears abundantly elsewhere on 

 the surface, usually as bright points which under the microscope 



Section magnified 1500 diameters. 



appear to be cross-sections of the lath-like form known as 

 rhabdite. 



The surface is also marked by veins or fissures of varying 

 widths, certain of which are parallel to the several directions of 

 the octahedron and form octahedral partings. These veins are 

 commonly bounded by schreibersite and are filled with a carbo- 

 naceous material containing phosphorus, sulphur and iron. 



The material available for analysis gave the following values: 



Iron 92-22 



Nickel 6-49 



Cobalt.. 0-42 



Copper 0-01 



Phosphorus — 0"28 



Sulphur 0-07 



Chromium — 0*01 



Silicon 0-049 



Carbon 0*09 



