HANDBOOK OP THE METEOEITE COLLECTIONS. 117 



the nickel-iron alloy and may then be associated with schreibersite 

 areas. Further, it may occur as isolated grains or flakes and filling 

 cracks in the olivine areas. 



The material analyzed was obtained by treating the metallic portion 

 with mercury bichloride, and after its solution separating the troilite 

 and schreibersite from carbon, silicates, etc., with the magnet and 

 from each other by lixiviation. The material thus obtained had a 

 specific gravity of 4.759 at 18° C. and the following composition : 



Per cent. 



Iron 62. 99 



Nickel 1 



Cobalt J • "^^ 



Phosphorus Trace. 



Sulphur 36. 35 



100. 13 

 The specular material lining the olivine cavities is essentially a 

 graphitic iron containing sulphur and chlorine. The material analyzed 

 was far from being homogeneous, as it was separated mechanically 

 with the aid of a glass. The composition was as follows : 



Per cent. 



Iron 84. 900 



Nickel 1 



Cobalt I ^-039 



Silica 2. 990 



Carbon 2. 810 



Sulphur 1. 750 



Phosphorus 1. 470 



Chlorine .100 



Alumina .940 



99. 999 

 Chromite occurs quite abundantly, varying in size from microscopic 

 grains to a crystal 1 millimeter in diameter. The crystals are more 

 or less perfect octahedrons, rarely modified by other forms, and then 

 only by GO (110), as noted in one instance. They are brilliant black 

 in color, with a metallic luster; nonmagnetic; have a specific gravity 

 of 4.49 at 18° C, with the following composition: 



Per cent. 



Chromic oxide (Cr^Os) 64.91 



Alumina (AUOs) 9.85 



Magnesia (MgO) 4.96 



Ferrous oxide (FeO) 17.97 



Silica (SiOa) 1.38 



99.07 

 Olivine occurs in more or less rounded masses which, when care- 

 fully extracted, show well-marked facets. These are probably not 



