METEORITES OF NORTH AMERICA. 393 



The analysis of the meteorite gave: 



Fe Ni Co Cu Cr CI S P Silicate 



92.68 6.97 0.52 0.02 0.00 0.03 0.01 0.34 0.01 =100.58 

 This indicates the following mineralogical composition: 



Nickel iron 97. 71 



Schreibersite 2. 20 



Troilite 0. 03 



Lawrencite 0. 05 



Silicate grains 0. 01 



100. 



On solution in aqua regia only a slight residue of silicate grains was left. The brown flocculent residue usual 

 where cohenite is present was lacking altogether so that in the piece analyzed no cohenite was probably present. 



The specific gravity was determined by Leick at 7.7460 at 16° centigrade on a piece weighing 270 grams. This 

 gives, with the removal of the accessory constituents, 7.7728 as the specific gravity of the nickel-iron. In order to 

 determine whether the cohenite was absent only from the piece used for analysis (which did not contain large crys- 

 tals) or whether the crystals appearing like cohenite were in fact all schreibersite, a larger piece weighing 9.1 grams 

 relatively rich in the constituent was dissolved. This showed much more resistance to attack by hydrochloric acid 

 than any meteoric iron I have ever seen. A mixture of one part acid and one part water had finally to be employed, 

 but even then the solution went on slowly. Besides 0.21 per cent of tsenite and 0.48 per cent of some angular pieces, 

 schreibersite with some rhabdite was observed, amounting together to 3.18 per cent. In addition there was 0.15 per 

 cent calculated from the phosphorus contained in the solution. This shows that shcreibersite occurs, like cohenite, 

 imbedded in kamacite; and also, what I have often declared, that these two minerals can not be distinguished without 

 a careful study of isolated crystals. 



The meteorite is distributed. Ward possesses 753 grams; Vienna 641 grams. 



BIBLIOGRAPHY. 



1. 1869: Shepard. Notices of new meteoric irons in the United States. — 2. Meteoric iron from southeastern Missouri. 



Amer. Journ. Sci., 2d ser., vol. 47, pp. 233-234. (Analysis.) 



2. 1881: Brezina. Bericht III, Sitzber. Wien. Akad. Bd. 84 I, pp. 279, 280. 



3. 1885: Brezina. Wiener Sammlung, pp. 207, 215, 216, and 234. 



4. 1893: Meunier. Revision des fers meteoriques, pp. 29 and 32. 



5. 1894: Cohen. Meteoritenkunde, p. 115. 



6. 1895: Brezina. Wiener Sammlung, p. 286. 



7. 1897: Wulfing. Die meteoriten in Sammlungen, pp. 301 and 302. 



8. 1900: Cohen. Meteoreisen-studien XI. Ann. K. K. Naturhist. Hofmus. Wien, pp. 369-371. 



SAINT GENEVIEVE COUNTY. 



Missouri. 



Latitude 37° 47' N., longitude 100° 20 / W. 



Iron. Fine octahedrite (Of ) of Brezina. 



Found, 1888. 



Weight, 244J kgs. (539 lbs). 



This meteorite was first described by Ward, 1 as follows: 



This iron was discovered in the autumn of 1888 in the extreme western portion of St. Genevieve County, Missouri, 

 at a point about 1 mile west of Punjaub, a little hamlet no longer existing. We have decided in the lack of closer 

 possible location to give it the name of the county, whose county seat of the same name lies some 15 miles to the 

 eastward. 



It was found by Mr. Zeb Murphy, a surveyor, who retained it in his possession for several years, showing it at county 

 fairs, etc. It was subsequently bought from Mr. Murphy by Mr. F. P. Graves, the secretary and assistant superintend- 

 ent of the Doe Run Lead Company, whose headquarters are in the town of Doe Run, Missouri. Mr. Graves has been 

 a life-long collector of the minerals in this part of Missouri, and this St. Genevieve meteorite has been for some years 

 past a crowning piece in his fine cabinet. From him it was obtained by the present writer in January, 1900. 



The shape of the St. Genevieve siderite is an elongated spheroid, considerably flattened upon one side with a 

 rudely crescent-shaped, shallow depression in the middle part. Its greatest length is 20 inches, its two other dimensions 

 are each 15.5 inches. Its weight when I first obtained it, before any part had been cut from it, was 539 pounds. 



The exterior of the mass shows no sharp distinct pittings, although having several shallow depressions that appear 

 to have been prior to the oxidation which has largely covered the surface and which lias quite destroyed any trace of 

 outer crust or skin, if such ever existed. 



