432 E. E. Hoivell — Beaver Creek Meteorite. 



Fe 90-68 



Ni 8-80 



Co -49 



Cu -03 



100-00 



By the procedure outlined in one of the footnotes to the 

 foregoing analysis the isolation of magnetite from all but a 

 very small proportion of siliceous matter is easy. It then 

 appears under the microscope as irregular grains of a dull 

 black lusterless surface. Only one grain presented an appar- 

 ently octahedral aspect. 



The main portion of the meteoric material, now freed from 

 all magnetic matter, was thoroughly niixed and pulverized. 

 Its composition follows : 



Analysis of unmagnetic material. 

 S 2-21 



Fe g.g^ r 6-08 troilite. 



FeO -24) __ , 



^ n ,, }■ 75 chromite. 



Or„U 3 'Ol \ 



SiO„ _ ■. 45-87 



TiOj... -09 



A1„0 3 2-30 



Feb 1244 



NiO _ -07 



MnO -26 (too low). 



CaO 1-96 



MgO 28-24 



K 2 -15 



Na„0 -98 



Li.,0 .' none 



H 2 above 100° C. -34 



P 2 6 -30 



Cl trace 



99-83 



The assumption of FeO as the sole divalent element in the 

 chromite is entirely arbitrary. Qualitative tests on a minute 

 quantity separated from the silicates showed that the mineral 

 carried magnesia and alumina also. The extremely weak mag- 

 netism of the troilite appears clearly from the fact that the 

 electro-magnet produced only a barely perceptible concentra- 

 tion of it in the magnetic mixture, as shown by comparing the 

 percentages of troilite and of silicates therein with those just 

 above. 



A portion of the unmagnetic powder was then divided into 

 a soluble and an insoluble part by digesting for a few hours 



