388 J. K Whitfield — The Roclcioood Meteorite. 



of about 85 pounds, and sp. gr. of -±-240. An idea of the 

 appearance of this piece can be had from the foregoing cut, 

 which is from a photograph reduced to ■§• natural size. 



The mass is quite brittle, very hard to saw, but easily broken 

 by hammering. Cut slices show many irregularly shaped stony 

 fragments with some nodules, the largest seen being about 

 f-xf inches on the surface diameter. In the larger slices the 

 stony part is so broken as to give the polished surface a brecci- 

 ated appearance. In analysis the metallic portion was freed 

 from the mineral part by crushing to rather fine particles and 

 separating by the aid of a magnet. This was again treated in 

 the same manner, and the resulting metal washed with alcohol 

 and quickly dried ; by this method it was found possible to 

 free the metal from all but the merest trace of stony substance. 



The metallic portion proved to be an alloy, rich in nickel, as 

 is shown by the following figures : 



Fe 87-59 



Ni 12-09 



Co trace 



Cu " 



P none 



S____ " 



99-68 



The metallic grains seem to be quite evenly distributed 

 through the mass. In but one instance does a nodule appear 

 to have attained a size larger than that of a pea, and on the 

 section of this nodule we were able to obtain the Widmann- 

 statten figures by etching. Cut No. 2 shows the polished slice 

 containing; this nodule, natural size. 



Natural size. 



The rocky part, after being freed as well as possible from 

 metal, was finally ground aud digested with dilute hydrochloric 

 acid, and the resulting soluble and insoluble portions investi- 



