434 E. E. Howell — Beaver Creek Meteorite. 



Whether the titanium belongs to the pyroxene or is to be 

 credited to a special titaniferons mineral, such as ilmenite for 

 instance, the analysis does not show. The siliceous constitu- 

 ents of the stony matter appear from the analysis to be chiefly 

 olivine and the bronzite variety of enstatite. In order to 

 throw further light, if possible, on the character of the min- 

 eral or minerals in the insoluble part, a portion of the latter 

 was subjected to prolonged treatment with hydrochloric acid 

 followed by dilute potassium hydroxide solution, after which 

 an attempt was made to effect further separation by the Sonn- 

 stadt solution with very limited success. The main portion 

 thus finally obtained was analyzed. It gave the following 

 composition : 



FeO -31 j . _. , 



t^ c\ n . }■ 96 chromite. 



Cr 2 (J 3 ... -6o 



Si0 2 56-48 



Ti0 2 -19 



A),0, 2-65 



FeO 9-14 



NiO ? 



MnO -46 



CaO 2-97 



MsjO 25-86 



I<0 -18 



Na a O 1-20 



H„0 V 



100-09 



Comparison of this with the preceding analysis of the in- 

 soluble part of the meteorite shows unquestionably that its 

 siliceous component is a mixture and that the effect of the 

 second acid and subsecpiient mechanical treatment was to re- 

 move partially a relatively soluble alkali-lime-alumina silicate. 

 That this more soluble ingredient is largely of feldspathic 

 nature is, however, negatived by the fact that the last analysis, 

 omitting chromite and titanium, affords almost exactly a meta- 

 silicate ratio, and by the failure of Dr. Merrill to identify any 

 feldspathic mineral constituent in more than mere traces. 



From the data at hand the composition of the meteorite as a 

 whole resolves itself as follows, assuming for the mixed sili- 

 cates in the magnetic portion the same composition as that 

 shown by the non-magnetic mixture : 



