4 6 



Field Columbian Museum — Geology, Vol. t, 



AEROSIDEROLITES OR IRON-STONE METEORITES. 



Cat 



No. 



Date 

 of Fall or Find 



NAME AND DESCRIPTION. 



Weight 

 in grams. 



172 



175 



176 

 177 



178 



180 



182 



183 



184 



183 

 180 



187 

 374 



Found 1874. 



Fell 1879, 

 May 10. 

 5 P.M. 



Found 1880. 



Found 1885. 



Found 1887. 



Mejillones, near Desert of Atacama, South 

 America. 

 Thin, polished slab. The nickel-iron is distributed 

 in a fine" network and occasional nodules through 

 an amorphous ground-mass. (W.) 



Estherville, Emmett County, Iowa. 



Four complete individuals, varying in size from 

 that of a pea to that of a walnut. The surface 

 shows rounded knobs, and is partly of the color 

 of blued steel and partly nickel-white. (K.) 



Irregular fragment, much oxidized. (W. ) 



Full-sized slab, polished. The iron appears in 

 large nodules, irregular flakes and a long, narrow 

 vein, distributed through a greenish-black, struc- 

 tureless ground-mass. (W.) 



^Thirteen complete individuals, varying in size 

 from that of a pea to that of a walnut. Surface 

 like No. 175. (W.) 



Carroll County, (Eagle Station), Kentucky. 



Sawed slab showing natural surface deeply pitted, 

 and polished surface. The iron matrix encloses 

 nodules of olivine, some a centimeter in diam- 

 eter, transparent, and of brilliant lustre. (K. ) 



Grains of olivine, separated from the iron, some 

 coarse and some in a powdered state. (K.) 



Pavlodar, Semipalatinsk, Asiatic Russia. 

 Polished fragment, made up principally of olivine 

 enclosed in an iron matrix. Also some loose 

 grains of olivine. (W.) 



Rockwood, Cumberland Co., Tennessee. 



From Mass No. 1 . Thin slab showing natural and 

 etched surfaces. The metallic grains are small and 

 about evenly distributed, except for three large 

 nodules, one of which, having a diameter of 

 1.5 cm. shows well marked W. f. The metallic 

 portion serves as a matrix to hold the siliceous 

 grains. (W.) 



Mass No. 2. Complete individual. The crust is 

 reddish-brown and cracked in several places. 

 No well-marked pits are seen. (W ) 



From Mass No. 3. One-half of the original find, 

 with natural and polished surface. General struc- 

 ture like No. 184, but the specimen shows a 

 larger proportion of the non-metallic minerals, 

 and these occur occasionally in large nodules. 



(W.) 



From Mass No. 1 (?). Large segment showing nat- 

 ural and polished surfaces. Structure like No. 186. 



(W.) 



*Segment of complete individual, showing natural 

 and polished surfaces. Structure like No. 184. 



(W.) 



37 



2,721 



47 



106 

 96 



13 



40.5 

 4,351 



801 



6,151 



670 



