n8 Field Columbian Museum — Geology, Vol. III. 



inch (2.5 cm.), and as the ridges between them are but slightly ele- 

 vated they give the surface an undulatory character. 



The surfaces intermediate between front and rear show in general 

 transitional crust characters. The crust is more uniform, less scaly 

 and thicker than on the front side and less scoriaceous than on the 

 rear. The edges by which the sides join the front and rear are in gen- 

 eral rather sharp but somewhat rounded. One of these side surfaces 

 is a plane, about two square inches (4 cm.) in area, at right angles to 

 the long axis of the meteorite. The clots of fused matter are much 

 thicker and narrower on this face, making it quite rough. Only one 

 other broad side surface occurs. This is concave and has a smooth 

 crust more nearly like that of the front side but thicker. Those sur- 

 faces showing no primary crust, but which were original on the meteor- 

 ite at the time of its finding, are rough from fracture, but a rounding 

 off of the protruding grains has taken place. It is probable that the 

 meteorite broke during its descent to the earth and these surfaces were 

 somewhat glazed over. 



The interior of the meteorite presents a compact, homogeneous 

 appearance. In color it is a chocolate to reddish-brown, thickly 

 dotted with metallic grains which show upon a polished surface. It 

 is probable that the present color is largely the result of staining from 

 rust, and that the original color is in no place preserved. The metallic 

 grains are quite minute, few reaching a millimeter in any dimension. 

 They appear uniformly but not very abundantly distributed. To 

 the naked eye no chondritic structure is visible either upon a frac- 

 tured or polished surface. Under a lens, however, circular spots now 

 dark and now light, but for the most part darker than the prevailing 

 color indicate the presence of chondri. The compact appearance of 

 the meteorite likewise disappears under a lens. The whole surface of 

 a polished mass is then seen to be thickly sprinkled over with minute, 

 irregular holes, which may join or be isolated. These cavities may 

 be in part due to the falling out of grains, in the process of polishing, 

 but as their borders frequently show a coating of limonite, it is 

 probable that many represent an original cellular structure, or are due 

 to weathered-out constituents. 



The specific gravity of the meteorite, obtained by weighing a piece 

 of 557 grams, was found to be 3.4005. 



Crust sections are of interest in showing a structure different from 

 that usually seen. The crust microscopically shows two well-marked 

 zones. The outer, .1 mm. thick, is opaque and blebby. The inner, 

 .3 mm. thick, has a microlitic structure with occasional rounded crys- 

 tals of olivine. It is semi-opaque, presenting a gray appearance as 



