192 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



crystalline gradually transmit light and have four extinctions. But the cleavable mineral, when perfectly crystalline, 

 is continually dark between crossed nicols. They, therefore, belong to different crystalline systems. 



In consideration of the specific gravities of the principal elements of this meteorite there appears to be reason to 

 look for the presence of a lighter mineral than olivine. Thus: 



Olivine Iron The stone Maskelynite 



3.30 7.50 3.44 2.65 



The small amount of iron present would probably raise the specific gravity of the stone higher than 3.44 if not 

 counteracted by a lighter mineral. 



The metallic iron is bright and silvery when polished. The larger pieces are about 1.5 mm. in diameter but the 

 smallest are mere specks. They are dispersed among the other grains in a very irregular and fortuitous manner. Some 

 of the finest fragments are in the chondri. 



Troilite is in about the same proportion as metallic iron. It has a dark bronzy luster. * * * 



About a year later a further study of the meteorite was reported by Winchell and Berkey 5 

 as follows: 



For the purpose of further determination of the mineral which resembles maskelynite, two micro-chemical tests 

 were made. The particles are so small that no chemical examination is practicable, viz: 



1. Particles belonging to group 2, i. e., glass. 



2. Particles of a translucent mineral which showed angular fracture and but little or no cleavage, presumed to be 

 the doubly refracting mineral which is like maskelynite, and possibly represented by groups 5 and 6. 



With the first the test revealed lime and soda. With the second were developed, along with fluosilicates of lime, 

 a liberal sprinkling of hexagonal rods of fluosilicate of soda. 



There is not enough of this mineral present to warrant an attempt at quantitative analysis. It remains, therefore, 

 undecided whether the meteorite contains maskelynite. The evidences in favor of its presence are: 



1. A feebly polarizing mineral, low in double refraction, occurring in the midst of the chondri and elsewhere. 



2. This mineral shows little or no cleavage. 



3. It contains lime and soda. 



4. The glass from which it seems to have crystallized also contains soda and no soda has been detected in the other 

 minerals. 



An analysis of some small fragments of this meteorite was made by C. P. Berkey, of the University of Minnesota. 

 Preliminary qualitative tests showed the following elements: Silicon, aluminum, iron, nickel, calcium, magnesium, 

 and sulphur. Silicon occurs as the oxide, forming the mineral tridymite and also occurs in the silicates maskelynite, 

 olivine, and enstatite. Aluminum, calcium, and magnesium and a part of the iron occur in the silicates. Nickel is 

 present native, or possibly forming an alloy with the iron. Iron is prssent in three forms, metallic iron, ferrous oxides 

 in the silicates, and ferric oxide chiefly as an oxidation from the native metal. 



Sulphur is present in small quantity in the mineral troilite. No alkali metals were found. 

 The bulk of the analysis gave: 



Silica, SiO a 41.16 



Alumina, A1 2 3 6. 60 



Iron, calculated as Fe 24. 26 



Magnesia, MgO 19. 03 



Lime, CaO 4. 34 



Nickel, calculated as Ni 2. 26 



Sulphur, S Traces. 



97.65 

 In the above analysis all the compounds appear in the correct chemical combination with the exception of iron and 



sulphur. Sulphur should appear as FeS, but the small amount obtained made such estimate impracticable. A part 



of the 24.26 per cent of iron should be estimated as FeO and also a part as Fe 2 3 , which will then bring the analysis to 



the proper total amount. 



The lacking 2.35 per cent should properly be accounted for in this way; 6.89 per cent of iron disposed of in this 



way satisfies the chemical proportions. 



The meteorite is distributed among collections. 



BIBLIOGRAPHY. 



1. 1894: Winchell. Amer. Geol., vol 14, p. 389. 



2. 1895: Brezina. Wiener Sammlung, p. 247. 



3. 1896: Winchell. Amer. Geol., vol. 17, p. 173. 



4. 1896: Winchell. Comptes Rendus, Tome 122, Mar. 16, p. 681. 



5. 1897: Winchell. Amer. Geol., vol. 20, p. 316. 



