178 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



and almost colorless. The masses are quite heavy and vary much in specific gravity in different parts, but the average 

 can not be less than 4.5. 



When broken one is immediately struck with the large nodules of metal among the gray and green stony substances, 

 some of which will weigh 100 grams or more. In this respect this meteorite is unique, differing entirely from the mixed 

 meteorites of Pallas, Atacama, etc., or the known meteoric stones rich in iron, for in none of these has the iron this 

 nodular character. 



Another striking feature in the relation of the iron and stony matter is that the larger nodules of iron seem to have 

 shrunk away from the matrix, an elongated fissure of from 1 to 3 mm. sometimes intervening, separating the matrix and 

 nodules to the extent of one-half the circumference of the latter and appearing as if the iron had contracted from the 

 stony matrix during the process of cooling. There are numerous small cavities of various sizes where there are no iron 

 nodules, and where the minerals appear more crystalline, indicating an irregular shrinkage during the consolidation. 



At first sight I expected to find more than two earthy minerals. The microscope gave, as with most meteoric 

 stones, unsatisfactory results. 



I therefore tried to separate the stony materials mechanically; the only mineral that I was enabled to obtain pure 

 in sufficient quantity has an olive-green color and occurs in masses of from one-half to 1 inch in size, having an easy 

 cleavage, especially in one direction; this proved to be olivine. The same mineral occurs also in minute rounded 

 concretions in other parts of the meteorite, and minute, almost colorless, crystalline particles in the cavities I take to be 

 olivine. Nickeliferous iron, as already stated, is very abundant. Troilite exists in small quantity. Chromite was 

 also found. 



That the stony part of this meteorite consists essentially of bronzite and olivine will be seen from the chemical 

 investigation, which found only three essential constituents, viz, silica, ferrous oxide, and magnesia. Another silicate 

 will be referred to beyond, consisting of the same oxides but in different proportions from either bronzite or olivine. 



Chemical constitution. The stony part, pulverized and freed as far as possible from metallic iron by the aid of the 

 magnet, when treated with hydrochloric acid on a water bath for several hours, is resolved into soluble and insoluble 

 partc, the proportions varying very much with different fragments and ranging from 16 to 60 per cent for the soluble 

 part. This soluble part consists of silica, ferrous oxide, and magnesia, and without a trace of lime, thus indicating the 

 absence of anorthite. 



1. Insoluble portion. The insoluble portion was carefully analyzed by fusion with carbonate of soda and found to 



contain: 



Oxygen ratio. 



Silica 54.12 29.120 



Ferrous oxide 21. 05 4. 670 



Chromic oxide trace 



Magnesia 24.50 9.800 



Soda with traces of potash and lithia 09 . 023 



Alumina... .03 .013 



99.29 



The oxygen ratio clearly indicates the mineral to be Sift, being virtually Si(MgFe), or the common form of bronzite 

 contained in meteorites. 



2. Soluble portion. On testing the green mineral already referred to I found that this was the soluble portion, and 

 it was readily detected in a pure state from the stony part of the meteorite. Its cleavage in one direction is very 

 perfect; its specific gravity 3.35; hardness about 7; pulverized it is readily and completely decomposed by hydro- 

 chloric acid. Two analyses were made, one by decomposing it directly with hydrochloric acid over a water bath and 

 the other by first fusing it with carbonate of soda, the two analyses agreeing perfectly. 



Oxygen ratio. 



Silica 41.50 22.13 



Ferrous oxide 14. 21 3. 12 



Magnesia 44. 64 17. 86 



100.35 



The above analysis gives the formula SiRj, or that of olivine. 



3. Opalescent silicate. In some parts of this meteorite a silicate occurs that is opalescent, of a light greenish-yellow 

 color, and cleaves readily. In one instance I observed it making a notable projection on the surface. Although I 

 had a number of fragments of the meteorite for examination, amounting to 10 or 12 pounds, I did not obtain enough of 

 the mineral to establish positively its true character, but I hope to obtain more. An analysis was made with about 



100 mg. of the pure mineral with the following result: 



Oxygen ratio. 



Silica 49.60 26.12 



Ferrous oxide 15. 78 3. 50 



Magnesia 33.01 13.21 



98.39 



Equivalent to Sil^+SijR, one atom of bronzite plus one atom of olivine, a form of silicate that we might expect 

 to find in meteorites. 



