60 



L. G. Eakins — New Stone Meteorite. 



From some of the finely powdered material the metallic 

 portion was extracted by the aid of an electromagnet, and as 

 slight amounts of troilite and the silicates remained attached, 

 this was then treated with a neutral solution of copper sul- 

 phate and the solution analyzed. This gave the metallic part 

 as constituting 2*23 per cent of the mass, with the following 

 composition, calculated to 100 per cent : 



Fe . 88-74 



Ni 10-68 



Co -58 



100-00 



The residue from which the metallic portion had been 

 removed was then digested with dilute hydrochloric acid ; this 

 dissolved the troilite and olivine, and the soluble and insoluble 

 portions were then separated and analyzed in the usual man- 

 ner. The sulphur present was calculated as troilite, with the 

 formula FeS, and has been deducted in stating the analysis of 

 the soluble portion : 





Soluble in H01. 













(Troilite deducted.) 







Insoluble in HC1. 











Molec- 







Mo- 







Calculated 



ular 



Anal- 



Calculated 



lecular 





Analysis. 



to 100$. 



ratios. 



ysis. 



to lOOg. 



ratios. 



Si0 2 .. 



. 15-67 



38-13 



•636 



30-36 



56-14 



•936 



A1 2 3 __ 



. 1-06 



2-58 



•025 



2*02 



3-78 



•036 



Cr a 3 -- 









•54 



1-00 



•007 



FeO __ 



. 8-12 



1976 



•274 



4-95 



9-15 



•127 



NiO __ 



•49 



1-19 



•016 









CaO .. 



'42 



1-02 



•018 



1-94 



3-59 



•064 



MgO . _ 



. 15-34 



37*32 



•933 



13*212 



24-44 



•611 



K 2 _. 



_ undet. 







•10 



•19 



•002 



Na 2 0__ 



. undet. 







•95 



1-76 



•028 



41-10 



100-00 



54-08 



100-00 



In the soluble portion the ratio of the RO group to the 

 SiO„ is as close to that of olivine as could be expected in work 

 of this kind, The insoluble portion, after removing the Cr 2 3 

 and a proportional amount of FeO to form cliromite, gives 

 these ratios : 



RO 



•825 



AW 

 •036 



Si0 2 

 •936, 



which seem to bear no definite relations to each other. It is 

 noticeable, however, that the A1 2 3 and alkalies present are 

 nearly in the proportion required for a feldspar, and if one of 

 the oligoclase type were present in proportion to this A1 2 3 , it 

 would have these molecular values : 



