3o8 



Field Columbian Museum — Geology, Vol. I. 



The analysis gave the following results: 



Fe 



Ni 



Co 



Cu 



Mn 



P 



C 



S 



Si 



Insol. 



00.56 

 7.71 

 1.07 

 0.14 



Trace 

 0.24 

 0.0 1 

 0.025 

 0.006 

 0.09 



99.85 



Omitting silicon and insoluble matter the analysis indicates that 

 the meteorite has the following mineralogical composition: 



Nickel-iron (Fe, Ni, Co, Cu, Mn.) 97.98 



Schreibersite 1.55 



Cohenite 0.15 



Troilite 0.07 



9975 



As the locality where the meteorite was found may be said in a 

 certain sense to be in the vicinity of Toluca, it becomes an important 

 question from the standpoint of the collector to determine whether 

 the specimen is to be regarded a portion of the Toluca fall. Los 

 Reyes is about forty miles (sixty-two kilometers) in a direct line east 

 of Toluca. It is the little station at the southern end of Lake Tex- 

 coco where the Morelos division of the Interoceanic Railway joins 

 the main line, about twelve miles southeast of the City of Mexico. 

 On the same line of railroad twenty-five miles from the City of Mex- 

 ico is the town of Ameca-Ameca, where the find of another iron mete- 

 orite has been reported by Castillo.* Castillo classes this iron with 

 the Toluca meteorites,! and describes the "zone" of Toluca mete- 

 orites as extending from Ameca-Ameca on the east to Xiquipilco in 

 the valley of Toluca [on the west]. If Castillo is right in this conclu- 

 sion the Los Reyes meteorite comes within this zone, as Los Reyes 

 is some fifteen miles (twenty-three kilometers) nearer Toluca than 

 Ameca-Ameca. Castillo unfortunately gives no description of the 

 'Ameca-Ameca meteorite by which its resemblance or otherwise to 

 the known specimens from Toluca can be determined. He simply 

 describes it as a " small nodule of meteoric iron found in the village [of 



♦Catalogue Descriptif des Meteorites du Mexique, Paris, 1889, p. 3. 

 t Op. cit., p. 11. 



