96 Field Columbian Museum — Geology, Vol. III. 



III. ATAXITES. 



These iron meteorites are characterized by a fine granular to 

 compact structure throughout. They show no evidence of the cubic 

 cleavage and Neumann lines which characterize the hexahedrites, nor 

 of the lamellar structure, octahedrally arranged, of the octahedrites. 

 The individual grains are in some cases visible to the naked eye, but 

 for the most part are of microscopic or sub-microscopic dimensions. 

 In some occur peculiar streaks which seem to have crystallographic 

 arrangement, but their exact relations have not been determined. 

 These form a special group, which, while not ataxites in the strict- 

 est sense of the term, may be included among them for present pur- 

 poses. The ataxites show the greatest variation among all iron 

 meteorite*, in their nickel-cobalt content. This varies from 6 to i6per 

 cent, and in the doubtful Oktibbeha to 6^ per cent. Two general 



f 





Si RATH K 



Name. 



Campo del Cielo . 

 (Wohler's Iron.) 



Cincinnati 



Locust Grove 



San Fraiinsco del Mezqiiita 



Siratik (Senegal). . 



Fe. 



92-33 

 89 22 

 94.25 

 94-47 

 94-30 

 93-38 

 93-36 

 94.07 



Ni. 



Co. 



7.38 

 9.51 



-57 

 .68 

 -64 

 •39 



-87 

 ■77 



Cu. Cr. 



•03 

 .01 



tr. 



-03 

 .01 



-03 



.20 

 .18 

 .05 

 .18 



-23 

 .16 

 .26 



.05 

 .05 

 .05 



-15 



.04 



CI. 



Miscellaneous.' ^ 



P. Fe. Ni. .4 



Sn c 



Scbreibersite. .c 

 C. etc 2 



